diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 37149ba2..8ed515c4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -144,7 +144,6 @@ jobs:
             -p cdk --no-default-features,
             -p cdk --no-default-features --features wallet,
             -p cdk --no-default-features --features mint,
-            -p cdk --no-default-features --features "mint swagger",
             -p cdk-axum,
             -p cdk-strike,
             -p cdk-lnbits,
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
new file mode 100644
index 00000000..956ba5ed
--- /dev/null
+++ b/DEVELOPMENT.md
@@ -0,0 +1,152 @@
+# Development Guide
+
+This guide will help you set up your development environment for working with the CDK repository.
+
+## Prerequisites
+
+Before you begin, ensure you have:
+- Git installed on your system
+- GitHub account
+- Basic familiarity with command line operations
+
+## Initial Setup
+
+### 1. Fork and Clone the Repository
+
+1. Navigate to the CDK repository on GitHub
+2. Click the "Fork" button in the top-right corner
+3. Clone your forked repository:
+```bash
+git clone https://github.com/YOUR-USERNAME/cdk.git
+cd cdk
+```
+
+### 2. Install Nix
+
+<!-- 
+MIT License
+
+Copyright (c) 2021 elsirion
+https://github.com/fedimint/fedimint/blob/master/docs/dev-env.md
+-->
+
+CDK uses [Nix](https://nixos.org/explore.html) for building, CI, and managing dev environment.
+Note: only `Nix` (the language & package manager) and not the NixOS (the Linux distribution) is needed.
+Nix can be installed on any Linux distribution and macOS.
+
+While it is technically possible to not use Nix, it is highly recommended as
+it ensures consistent and reproducible environment for all developers.
+
+### Install Nix
+
+You have 2 options to install nix:
+
+* **RECOMMENDED:** The [Determinate Nix Installer](https://github.com/DeterminateSystems/nix-installer)
+* [The official installer](https://nixos.org/download.html)
+
+Example:
+
+```
+> nix --version
+nix (Nix) 2.9.1
+```
+
+The exact version might be different.
+
+### Enable nix flakes
+
+If you installed Nix using the "determinate installer" you can skip this step. If you used the "official installer", edit either `~/.config/nix/nix.conf` or `/etc/nix/nix.conf` and add:
+
+```
+experimental-features = nix-command flakes
+```
+
+If the Nix installation is in multi-user mode, don’t forget to restart the nix-daemon.
+
+## Use Nix Shell
+
+```sh
+  nix develop -c $SHELL  
+```
+
+## Common Development Tasks
+
+### Building the Project
+```sh
+just build
+```
+
+### Running Unit Tests
+```bash
+just test
+```
+
+### Running Integration Tests
+```bash
+just itest REDB/SQLITE/MEMEORY
+```
+
+### Running Format
+```bash
+just format
+```
+
+
+### Running Clippy
+```bash
+just clippy
+```
+
+### Running final check before commit
+```sh
+just final-check
+```
+
+
+## Best Practices
+
+1. **Branch Management**
+   - Create feature branches from `main`
+   - Use descriptive branch names: `feature/new-feature` or `fix/bug-description`
+
+2. **Commit Messages**
+   - Follow conventional commits format
+   - Begin with type: `feat:`, `fix:`, `docs:`, `chore:`, etc.
+   - Provide clear, concise descriptions
+
+3. **Testing**
+   - Write tests for new features
+   - Ensure all tests pass before submitting PR
+   - Include integration tests where applicable
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Development Shell Issues**
+   - Clean Nix store: `nix-collect-garbage -d`
+   - Remove and recreate development shell
+
+### Getting Help
+
+- Open an issue on GitHub
+- Check existing issues for similar problems
+- Include relevant error messages and system information
+- Reach out in Discord [Invite link](https://discord.gg/tUxMKd5YjN)
+
+## Contributing
+
+1. Create a feature branch
+2. Make your changes
+3. Run tests and formatting
+4. Submit a pull request
+5. Wait for review and address feedback
+
+## Additional Resources
+
+- [Nix Documentation](https://nixos.org/manual/nix/stable/)
+- [Contributing Guidelines](CONTRIBUTING.md)
+
+## License
+
+Refer to the LICENSE file in the repository for terms of use and distribution.
diff --git a/README.md b/README.md
index 174184b2..47eb1b77 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,6 @@ The project is split up into several crates in the `crates/` directory:
 | [16][16] | Animated QR codes | :x: |
 | [17][17] | WebSocket subscriptions  | :construction: |
 
-MSRV
 
 ## Bindings
 
@@ -75,6 +74,9 @@ All contributions welcome.
 
 Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, shall be licensed as above, without any additional terms or conditions.
 
+Please see the [development guide](DEVELOPMENT.md).
+
+
 [00]: https://github.com/cashubtc/nuts/blob/main/00.md
 [01]: https://github.com/cashubtc/nuts/blob/main/01.md
 [02]: https://github.com/cashubtc/nuts/blob/main/02.md
diff --git a/bindings/cdk-js/src/types/melt_quote.rs b/bindings/cdk-js/src/types/melt_quote.rs
index d6e6f325..c00ac8b7 100644
--- a/bindings/cdk-js/src/types/melt_quote.rs
+++ b/bindings/cdk-js/src/types/melt_quote.rs
@@ -33,7 +33,7 @@ impl JsMeltQuote {
 
     #[wasm_bindgen(getter)]
     pub fn unit(&self) -> JsCurrencyUnit {
-        self.inner.unit.into()
+        self.inner.unit.clone().into()
     }
 
     #[wasm_bindgen(getter)]
diff --git a/bindings/cdk-js/src/types/mint_quote.rs b/bindings/cdk-js/src/types/mint_quote.rs
index fed36a92..ebc7f0d7 100644
--- a/bindings/cdk-js/src/types/mint_quote.rs
+++ b/bindings/cdk-js/src/types/mint_quote.rs
@@ -33,7 +33,7 @@ impl JsMintQuote {
 
     #[wasm_bindgen(getter)]
     pub fn unit(&self) -> JsCurrencyUnit {
-        self.inner.unit.into()
+        self.inner.unit.clone().into()
     }
 
     #[wasm_bindgen(getter)]
diff --git a/crates/cdk-cli/src/sub_commands/mint_info.rs b/crates/cdk-cli/src/sub_commands/mint_info.rs
index bcf9f5ec..739d9934 100644
--- a/crates/cdk-cli/src/sub_commands/mint_info.rs
+++ b/crates/cdk-cli/src/sub_commands/mint_info.rs
@@ -1,5 +1,6 @@
 use anyhow::Result;
 use cdk::mint_url::MintUrl;
+use cdk::wallet::client::HttpClientMethods;
 use cdk::HttpClient;
 use clap::Args;
 use url::Url;
diff --git a/crates/cdk-cli/src/sub_commands/pay_request.rs b/crates/cdk-cli/src/sub_commands/pay_request.rs
index 1498f980..308df1d0 100644
--- a/crates/cdk-cli/src/sub_commands/pay_request.rs
+++ b/crates/cdk-cli/src/sub_commands/pay_request.rs
@@ -21,7 +21,7 @@ pub async fn pay_request(
 ) -> Result<()> {
     let payment_request = &sub_command_args.payment_request;
 
-    let unit = payment_request.unit;
+    let unit = &payment_request.unit;
 
     let amount = match payment_request.amount {
         Some(amount) => amount,
@@ -56,7 +56,7 @@ pub async fn pay_request(
         }
 
         if let Some(unit) = unit {
-            if wallet.unit != unit {
+            if &wallet.unit != unit {
                 continue;
             }
         }
@@ -97,7 +97,7 @@ pub async fn pay_request(
         id: payment_request.payment_id.clone(),
         memo: None,
         mint: matching_wallet.mint_url.clone(),
-        unit: matching_wallet.unit,
+        unit: matching_wallet.unit.clone(),
         proofs,
     };
 
diff --git a/crates/cdk-cln/src/lib.rs b/crates/cdk-cln/src/lib.rs
index 1e8f609c..49bdc5c4 100644
--- a/crates/cdk-cln/src/lib.rs
+++ b/crates/cdk-cln/src/lib.rs
@@ -81,8 +81,8 @@ impl MintLightning for Cln {
         Settings {
             mpp: true,
             unit: CurrencyUnit::Msat,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
diff --git a/crates/cdk-fake-wallet/src/lib.rs b/crates/cdk-fake-wallet/src/lib.rs
index e0fba072..6c66466d 100644
--- a/crates/cdk-fake-wallet/src/lib.rs
+++ b/crates/cdk-fake-wallet/src/lib.rs
@@ -112,8 +112,8 @@ impl MintLightning for FakeWallet {
         Settings {
             mpp: true,
             unit: CurrencyUnit::Msat,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
diff --git a/crates/cdk-integration-tests/src/init_regtest.rs b/crates/cdk-integration-tests/src/init_regtest.rs
index f9664c18..51abb263 100644
--- a/crates/cdk-integration-tests/src/init_regtest.rs
+++ b/crates/cdk-integration-tests/src/init_regtest.rs
@@ -180,6 +180,7 @@ where
         Arc::new(database),
         ln_backends,
         supported_units,
+        HashMap::new(),
     )
     .await?;
 
diff --git a/crates/cdk-integration-tests/src/lib.rs b/crates/cdk-integration-tests/src/lib.rs
index eacc3b3a..31e45766 100644
--- a/crates/cdk-integration-tests/src/lib.rs
+++ b/crates/cdk-integration-tests/src/lib.rs
@@ -11,11 +11,11 @@ use cdk::cdk_lightning::MintLightning;
 use cdk::dhke::construct_proofs;
 use cdk::mint::FeeReserve;
 use cdk::nuts::{
-    CurrencyUnit, Id, KeySet, MeltMethodSettings, MintInfo, MintMethodSettings, MintQuoteState,
-    Nuts, PaymentMethod, PreMintSecrets, Proofs, State,
+    CurrencyUnit, Id, KeySet, MeltMethodSettings, MintBolt11Request, MintInfo, MintMethodSettings,
+    MintQuoteBolt11Request, MintQuoteState, Nuts, PaymentMethod, PreMintSecrets, Proofs, State,
 };
 use cdk::types::{LnKey, QuoteTTL};
-use cdk::wallet::client::HttpClient;
+use cdk::wallet::client::{HttpClient, HttpClientMethods};
 use cdk::{Mint, Wallet};
 use cdk_fake_wallet::FakeWallet;
 use init_regtest::{get_mint_addr, get_mint_port, get_mint_url};
@@ -82,6 +82,7 @@ pub async fn start_mint(
         Arc::new(MintMemoryDatabase::default()),
         ln_backends.clone(),
         supported_units,
+        HashMap::new(),
     )
     .await?;
     let cache_time_to_live = 3600;
@@ -158,8 +159,14 @@ pub async fn mint_proofs(
 
     let wallet_client = HttpClient::new();
 
+    let request = MintQuoteBolt11Request {
+        amount,
+        unit: CurrencyUnit::Sat,
+        description,
+    };
+
     let mint_quote = wallet_client
-        .post_mint_quote(mint_url.parse()?, 1.into(), CurrencyUnit::Sat, description)
+        .post_mint_quote(mint_url.parse()?, request)
         .await?;
 
     println!("Please pay: {}", mint_quote.request);
@@ -179,13 +186,12 @@ pub async fn mint_proofs(
 
     let premint_secrets = PreMintSecrets::random(keyset_id, amount, &SplitTarget::default())?;
 
-    let mint_response = wallet_client
-        .post_mint(
-            mint_url.parse()?,
-            &mint_quote.quote,
-            premint_secrets.clone(),
-        )
-        .await?;
+    let request = MintBolt11Request {
+        quote: mint_quote.quote,
+        outputs: premint_secrets.blinded_messages(),
+    };
+
+    let mint_response = wallet_client.post_mint(mint_url.parse()?, request).await?;
 
     let pre_swap_proofs = construct_proofs(
         mint_response.signatures,
diff --git a/crates/cdk-integration-tests/tests/fake_wallet.rs b/crates/cdk-integration-tests/tests/fake_wallet.rs
index 9b6f3ddb..e1eee402 100644
--- a/crates/cdk-integration-tests/tests/fake_wallet.rs
+++ b/crates/cdk-integration-tests/tests/fake_wallet.rs
@@ -5,8 +5,11 @@ use bip39::Mnemonic;
 use cdk::{
     amount::SplitTarget,
     cdk_database::WalletMemoryDatabase,
-    nuts::{CurrencyUnit, MeltQuoteState, PreMintSecrets, State},
-    wallet::{client::HttpClient, Wallet},
+    nuts::{CurrencyUnit, MeltBolt11Request, MeltQuoteState, PreMintSecrets, State},
+    wallet::{
+        client::{HttpClient, HttpClientMethods},
+        Wallet,
+    },
 };
 use cdk_fake_wallet::{create_fake_invoice, FakeInvoiceDescription};
 use cdk_integration_tests::attempt_to_swap_pending;
@@ -354,28 +357,23 @@ async fn test_fake_melt_change_in_quote() -> Result<()> {
 
     let client = HttpClient::new();
 
-    let melt_response = client
-        .post_melt(
-            MINT_URL.parse()?,
-            melt_quote.id.clone(),
-            proofs.clone(),
-            Some(premint_secrets.blinded_messages()),
-        )
-        .await?;
+    let melt_request = MeltBolt11Request {
+        quote: melt_quote.id.clone(),
+        inputs: proofs.clone(),
+        outputs: Some(premint_secrets.blinded_messages()),
+    };
+
+    let melt_response = client.post_melt(MINT_URL.parse()?, melt_request).await?;
 
     assert!(melt_response.change.is_some());
 
     let check = wallet.melt_quote_status(&melt_quote.id).await?;
+    let mut melt_change = melt_response.change.unwrap();
+    melt_change.sort_by(|a, b| a.amount.cmp(&b.amount));
+
+    let mut check = check.change.unwrap();
+    check.sort_by(|a, b| a.amount.cmp(&b.amount));
 
-    assert_eq!(
-        melt_response
-            .change
-            .unwrap()
-            .sort_by(|a, b| a.amount.cmp(&b.amount)),
-        check
-            .change
-            .unwrap()
-            .sort_by(|a, b| a.amount.cmp(&b.amount))
-    );
+    assert_eq!(melt_change, check);
     Ok(())
 }
diff --git a/crates/cdk-integration-tests/tests/mint.rs b/crates/cdk-integration-tests/tests/mint.rs
index c5cfbc58..b75f0378 100644
--- a/crates/cdk-integration-tests/tests/mint.rs
+++ b/crates/cdk-integration-tests/tests/mint.rs
@@ -52,6 +52,7 @@ async fn new_mint(fee: u64) -> Mint {
         Arc::new(MintMemoryDatabase::default()),
         HashMap::new(),
         supported_units,
+        HashMap::new(),
     )
     .await
     .unwrap()
@@ -327,7 +328,8 @@ async fn test_swap_unbalanced() -> Result<()> {
 async fn test_swap_overpay_underpay_fee() -> Result<()> {
     let mint = new_mint(1).await;
 
-    mint.rotate_keyset(CurrencyUnit::Sat, 1, 32, 1).await?;
+    mint.rotate_keyset(CurrencyUnit::Sat, 1, 32, 1, HashMap::new())
+        .await?;
 
     let keys = mint.pubkeys().await?.keysets.first().unwrap().clone().keys;
     let keyset_id = Id::from(&keys);
diff --git a/crates/cdk-integration-tests/tests/regtest.rs b/crates/cdk-integration-tests/tests/regtest.rs
index 900e93bf..2ba54595 100644
--- a/crates/cdk-integration-tests/tests/regtest.rs
+++ b/crates/cdk-integration-tests/tests/regtest.rs
@@ -6,9 +6,13 @@ use cdk::{
     amount::{Amount, SplitTarget},
     cdk_database::WalletMemoryDatabase,
     nuts::{
-        CurrencyUnit, MeltQuoteState, MintQuoteState, NotificationPayload, PreMintSecrets, State,
+        CurrencyUnit, MeltQuoteState, MintBolt11Request, MintQuoteState, NotificationPayload,
+        PreMintSecrets, State,
+    },
+    wallet::{
+        client::{HttpClient, HttpClientMethods},
+        Wallet,
     },
-    wallet::{client::HttpClient, Wallet},
 };
 use cdk_integration_tests::init_regtest::{
     get_mint_url, get_mint_ws_url, init_cln_client, init_lnd_client,
@@ -362,15 +366,16 @@ async fn test_cached_mint() -> Result<()> {
     let premint_secrets =
         PreMintSecrets::random(active_keyset_id, 31.into(), &SplitTarget::default()).unwrap();
 
+    let request = MintBolt11Request {
+        quote: quote.id,
+        outputs: premint_secrets.blinded_messages(),
+    };
+
     let response = http_client
-        .post_mint(
-            get_mint_url().as_str().parse()?,
-            &quote.id,
-            premint_secrets.clone(),
-        )
+        .post_mint(get_mint_url().as_str().parse()?, request.clone())
         .await?;
     let response1 = http_client
-        .post_mint(get_mint_url().as_str().parse()?, &quote.id, premint_secrets)
+        .post_mint(get_mint_url().as_str().parse()?, request)
         .await?;
 
     assert!(response == response1);
diff --git a/crates/cdk-lnbits/src/lib.rs b/crates/cdk-lnbits/src/lib.rs
index 64e7bef7..21103d12 100644
--- a/crates/cdk-lnbits/src/lib.rs
+++ b/crates/cdk-lnbits/src/lib.rs
@@ -80,8 +80,8 @@ impl MintLightning for LNbits {
         Settings {
             mpp: false,
             unit: CurrencyUnit::Sat,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
diff --git a/crates/cdk-lnd/src/lib.rs b/crates/cdk-lnd/src/lib.rs
index c5ecbeb8..b2319004 100644
--- a/crates/cdk-lnd/src/lib.rs
+++ b/crates/cdk-lnd/src/lib.rs
@@ -88,8 +88,8 @@ impl MintLightning for Lnd {
         Settings {
             mpp: true,
             unit: CurrencyUnit::Msat,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
diff --git a/crates/cdk-mintd/src/main.rs b/crates/cdk-mintd/src/main.rs
index 695f1d4c..17bd6379 100644
--- a/crates/cdk-mintd/src/main.rs
+++ b/crates/cdk-mintd/src/main.rs
@@ -188,7 +188,7 @@ async fn main() -> anyhow::Result<()> {
                     api_key.clone(),
                     MintMethodSettings::default(),
                     MeltMethodSettings::default(),
-                    unit,
+                    unit.clone(),
                     Arc::new(Mutex::new(Some(receiver))),
                     webhook_url.to_string(),
                 )
@@ -199,7 +199,7 @@ async fn main() -> anyhow::Result<()> {
                     .await?;
                 routers.push(router);
 
-                let ln_key = LnKey::new(unit, PaymentMethod::Bolt11);
+                let ln_key = LnKey::new(unit.clone(), PaymentMethod::Bolt11);
 
                 ln_backends.insert(ln_key, Arc::new(strike));
 
@@ -237,7 +237,7 @@ async fn main() -> anyhow::Result<()> {
 
             let unit = CurrencyUnit::Sat;
 
-            let ln_key = LnKey::new(unit, PaymentMethod::Bolt11);
+            let ln_key = LnKey::new(unit.clone(), PaymentMethod::Bolt11);
 
             ln_backends.insert(ln_key, Arc::new(lnbits));
 
@@ -326,7 +326,7 @@ async fn main() -> anyhow::Result<()> {
             let units = settings.fake_wallet.unwrap_or_default().supported_units;
 
             for unit in units {
-                let ln_key = LnKey::new(unit, PaymentMethod::Bolt11);
+                let ln_key = LnKey::new(unit.clone(), PaymentMethod::Bolt11);
 
                 let wallet = Arc::new(FakeWallet::new(
                     fee_reserve.clone(),
@@ -361,13 +361,13 @@ async fn main() -> anyhow::Result<()> {
 
             let m = MppMethodSettings {
                 method: key.method,
-                unit: key.unit,
+                unit: key.unit.clone(),
                 mpp: settings.mpp,
             };
 
             let n4 = MintMethodSettings {
                 method: key.method,
-                unit: key.unit,
+                unit: key.unit.clone(),
                 min_amount: settings.mint_settings.min_amount,
                 max_amount: settings.mint_settings.max_amount,
                 description: settings.invoice_description,
@@ -375,7 +375,7 @@ async fn main() -> anyhow::Result<()> {
 
             let n5 = MeltMethodSettings {
                 method: key.method,
-                unit: key.unit,
+                unit: key.unit.clone(),
                 min_amount: settings.melt_settings.min_amount,
                 max_amount: settings.melt_settings.max_amount,
             };
@@ -438,6 +438,7 @@ async fn main() -> anyhow::Result<()> {
         localstore,
         ln_backends.clone(),
         supported_units,
+        HashMap::new(),
     )
     .await?;
 
diff --git a/crates/cdk-phoenixd/src/lib.rs b/crates/cdk-phoenixd/src/lib.rs
index 4aecfac6..16197f65 100644
--- a/crates/cdk-phoenixd/src/lib.rs
+++ b/crates/cdk-phoenixd/src/lib.rs
@@ -86,8 +86,8 @@ impl MintLightning for Phoenixd {
         Settings {
             mpp: false,
             unit: CurrencyUnit::Sat,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
diff --git a/crates/cdk-strike/src/lib.rs b/crates/cdk-strike/src/lib.rs
index 76eb0f25..7273112e 100644
--- a/crates/cdk-strike/src/lib.rs
+++ b/crates/cdk-strike/src/lib.rs
@@ -77,9 +77,9 @@ impl MintLightning for Strike {
     fn get_settings(&self) -> Settings {
         Settings {
             mpp: false,
-            unit: self.unit,
-            mint_settings: self.mint_settings,
-            melt_settings: self.melt_settings,
+            unit: self.unit.clone(),
+            mint_settings: self.mint_settings.clone(),
+            melt_settings: self.melt_settings.clone(),
             invoice_description: true,
         }
     }
@@ -288,7 +288,7 @@ impl MintLightning for Strike {
                     payment_preimage: None,
                     status: state,
                     total_spent: from_strike_amount(invoice.total_amount, &self.unit)?.into(),
-                    unit: self.unit,
+                    unit: self.unit.clone(),
                 }
             }
             Err(err) => match err {
@@ -297,7 +297,7 @@ impl MintLightning for Strike {
                     payment_preimage: None,
                     status: MeltQuoteState::Unknown,
                     total_spent: Amount::ZERO,
-                    unit: self.unit,
+                    unit: self.unit.clone(),
                 },
                 _ => {
                     return Err(Error::from(err).into());
diff --git a/crates/cdk/Cargo.toml b/crates/cdk/Cargo.toml
index e89311a5..81673861 100644
--- a/crates/cdk/Cargo.toml
+++ b/crates/cdk/Cargo.toml
@@ -13,6 +13,7 @@ license = "MIT"
 [features]
 default = ["mint", "wallet"]
 mint = ["dep:futures"]
+# We do not commit to a MSRV with swagger enabled
 swagger = ["mint", "dep:utoipa"]
 wallet = ["dep:reqwest"]
 bench = []
diff --git a/crates/cdk/src/mint/keysets.rs b/crates/cdk/src/mint/keysets.rs
index 3c9642be..66445608 100644
--- a/crates/cdk/src/mint/keysets.rs
+++ b/crates/cdk/src/mint/keysets.rs
@@ -1,5 +1,6 @@
-use std::collections::HashSet;
+use std::collections::{HashMap, HashSet};
 
+use bitcoin::bip32::DerivationPath;
 use tracing::instrument;
 
 use crate::Error;
@@ -89,14 +90,20 @@ impl Mint {
         derivation_path_index: u32,
         max_order: u8,
         input_fee_ppk: u64,
+        custom_paths: HashMap<CurrencyUnit, DerivationPath>,
     ) -> Result<(), Error> {
-        let derivation_path = derivation_path_from_unit(unit, derivation_path_index);
+        let derivation_path = match custom_paths.get(&unit) {
+            Some(path) => path.clone(),
+            None => derivation_path_from_unit(unit.clone(), derivation_path_index)
+                .ok_or(Error::UnsupportedUnit)?,
+        };
+
         let (keyset, keyset_info) = create_new_keyset(
             &self.secp_ctx,
             self.xpriv,
             derivation_path,
             Some(derivation_path_index),
-            unit,
+            unit.clone(),
             max_order,
             input_fee_ppk,
         );
diff --git a/crates/cdk/src/mint/melt.rs b/crates/cdk/src/mint/melt.rs
index a803868d..1613fc3c 100644
--- a/crates/cdk/src/mint/melt.rs
+++ b/crates/cdk/src/mint/melt.rs
@@ -74,11 +74,11 @@ impl Mint {
             }
         };
 
-        self.check_melt_request_acceptable(amount, *unit, PaymentMethod::Bolt11)?;
+        self.check_melt_request_acceptable(amount, unit.clone(), PaymentMethod::Bolt11)?;
 
         let ln = self
             .ln
-            .get(&LnKey::new(*unit, PaymentMethod::Bolt11))
+            .get(&LnKey::new(unit.clone(), PaymentMethod::Bolt11))
             .ok_or_else(|| {
                 tracing::info!("Could not get ln backend for {}, bolt11 ", unit);
 
@@ -97,7 +97,7 @@ impl Mint {
 
         let quote = MeltQuote::new(
             request.to_string(),
-            *unit,
+            unit.clone(),
             payment_quote.amount,
             payment_quote.fee,
             unix_time() + self.quote_ttl.melt_ttl,
@@ -457,7 +457,10 @@ impl Mint {
                     }
                     _ => None,
                 };
-                let ln = match self.ln.get(&LnKey::new(quote.unit, PaymentMethod::Bolt11)) {
+                let ln = match self
+                    .ln
+                    .get(&LnKey::new(quote.unit.clone(), PaymentMethod::Bolt11))
+                {
                     Some(ln) => ln,
                     None => {
                         tracing::info!("Could not get ln backend for {}, bolt11 ", quote.unit);
diff --git a/crates/cdk/src/mint/mint_nut04.rs b/crates/cdk/src/mint/mint_nut04.rs
index 92d032e5..9d78473d 100644
--- a/crates/cdk/src/mint/mint_nut04.rs
+++ b/crates/cdk/src/mint/mint_nut04.rs
@@ -12,7 +12,7 @@ impl Mint {
     fn check_mint_request_acceptable(
         &self,
         amount: Amount,
-        unit: CurrencyUnit,
+        unit: &CurrencyUnit,
     ) -> Result<(), Error> {
         let nut04 = &self.mint_info.nuts.nut04;
 
@@ -20,7 +20,7 @@ impl Mint {
             return Err(Error::MintingDisabled);
         }
 
-        match nut04.get_settings(&unit, &PaymentMethod::Bolt11) {
+        match nut04.get_settings(unit, &PaymentMethod::Bolt11) {
             Some(settings) => {
                 if settings
                     .max_amount
@@ -64,11 +64,11 @@ impl Mint {
             description,
         } = mint_quote_request;
 
-        self.check_mint_request_acceptable(amount, unit)?;
+        self.check_mint_request_acceptable(amount, &unit)?;
 
         let ln = self
             .ln
-            .get(&LnKey::new(unit, PaymentMethod::Bolt11))
+            .get(&LnKey::new(unit.clone(), PaymentMethod::Bolt11))
             .ok_or_else(|| {
                 tracing::info!("Bolt11 mint request for unsupported unit");
 
@@ -98,7 +98,7 @@ impl Mint {
         let quote = MintQuote::new(
             self.mint_url.clone(),
             create_invoice_response.request.to_string(),
-            unit,
+            unit.clone(),
             amount,
             create_invoice_response.expiry.unwrap_or(0),
             create_invoice_response.request_lookup_id.clone(),
diff --git a/crates/cdk/src/mint/mod.rs b/crates/cdk/src/mint/mod.rs
index 29a0b16f..d81d9b65 100644
--- a/crates/cdk/src/mint/mod.rs
+++ b/crates/cdk/src/mint/mod.rs
@@ -56,6 +56,7 @@ pub struct Mint {
 
 impl Mint {
     /// Create new [`Mint`]
+    #[allow(clippy::too_many_arguments)]
     pub async fn new(
         mint_url: &str,
         seed: &[u8],
@@ -65,6 +66,7 @@ impl Mint {
         ln: HashMap<LnKey, Arc<dyn MintLightning<Err = cdk_lightning::Error> + Send + Sync>>,
         // Hashmap where the key is the unit and value is (input fee ppk, max_order)
         supported_units: HashMap<CurrencyUnit, (u64, u8)>,
+        custom_paths: HashMap<CurrencyUnit, DerivationPath>,
     ) -> Result<Self, Error> {
         let secp_ctx = Secp256k1::new();
         let xpriv = Xpriv::new_master(bitcoin::Network::Bitcoin, seed).expect("RNG busted");
@@ -85,7 +87,7 @@ impl Mint {
 
             let keysets_by_unit: HashMap<CurrencyUnit, Vec<MintKeySetInfo>> =
                 keysets_infos.iter().fold(HashMap::new(), |mut acc, ks| {
-                    acc.entry(ks.unit).or_default().push(ks.clone());
+                    acc.entry(ks.unit.clone()).or_default().push(ks.clone());
                     acc
                 });
 
@@ -114,7 +116,7 @@ impl Mint {
                             &secp_ctx,
                             xpriv,
                             highest_index_keyset.max_order,
-                            highest_index_keyset.unit,
+                            highest_index_keyset.unit.clone(),
                             highest_index_keyset.derivation_path.clone(),
                         );
                         active_keysets.insert(id, keyset);
@@ -127,37 +129,46 @@ impl Mint {
                         highest_index_keyset.derivation_path_index.unwrap_or(0) + 1
                     };
 
-                    let derivation_path = derivation_path_from_unit(unit, derivation_path_index);
+                    let derivation_path = match custom_paths.get(&unit) {
+                        Some(path) => path.clone(),
+                        None => derivation_path_from_unit(unit.clone(), derivation_path_index)
+                            .ok_or(Error::UnsupportedUnit)?,
+                    };
 
                     let (keyset, keyset_info) = create_new_keyset(
                         &secp_ctx,
                         xpriv,
                         derivation_path,
                         Some(derivation_path_index),
-                        unit,
+                        unit.clone(),
                         *max_order,
                         *input_fee_ppk,
                     );
 
                     let id = keyset_info.id;
                     localstore.add_keyset_info(keyset_info).await?;
-                    localstore.set_active_keyset(unit, id).await?;
+                    localstore.set_active_keyset(unit.clone(), id).await?;
                     active_keysets.insert(id, keyset);
-                    active_keyset_units.push(unit);
+                    active_keyset_units.push(unit.clone());
                 }
             }
         }
 
         for (unit, (fee, max_order)) in supported_units {
             if !active_keyset_units.contains(&unit) {
-                let derivation_path = derivation_path_from_unit(unit, 0);
+                let derivation_path = match custom_paths.get(&unit) {
+                    Some(path) => path.clone(),
+                    None => {
+                        derivation_path_from_unit(unit.clone(), 0).ok_or(Error::UnsupportedUnit)?
+                    }
+                };
 
                 let (keyset, keyset_info) = create_new_keyset(
                     &secp_ctx,
                     xpriv,
                     derivation_path,
                     Some(0),
-                    unit,
+                    unit.clone(),
                     max_order,
                     fee,
                 );
@@ -197,7 +208,7 @@ impl Mint {
                 let mint = Arc::clone(&mint_arc);
                 let ln = Arc::clone(ln);
                 let shutdown = Arc::clone(&shutdown);
-                let key = *key;
+                let key = key.clone();
                 join_set.spawn(async move {
             if !ln.is_wait_invoice_active() {
             loop {
@@ -441,7 +452,8 @@ impl Mint {
 
         Ok(RestoreResponse {
             outputs,
-            signatures,
+            signatures: signatures.clone(),
+            promises: Some(signatures),
         })
     }
 
@@ -562,7 +574,7 @@ fn create_new_keyset<C: secp256k1::Signing>(
     );
     let keyset_info = MintKeySetInfo {
         id: keyset.id,
-        unit: keyset.unit,
+        unit: keyset.unit.clone(),
         active: true,
         valid_from: unix_time(),
         valid_to: None,
@@ -574,12 +586,17 @@ fn create_new_keyset<C: secp256k1::Signing>(
     (keyset, keyset_info)
 }
 
-fn derivation_path_from_unit(unit: CurrencyUnit, index: u32) -> DerivationPath {
-    DerivationPath::from(vec![
+fn derivation_path_from_unit(unit: CurrencyUnit, index: u32) -> Option<DerivationPath> {
+    let unit_index = match unit.derivation_index() {
+        Some(index) => index,
+        None => return None,
+    };
+
+    Some(DerivationPath::from(vec![
         ChildNumber::from_hardened_idx(0).expect("0 is a valid index"),
-        ChildNumber::from_hardened_idx(unit.derivation_index()).expect("0 is a valid index"),
+        ChildNumber::from_hardened_idx(unit_index).expect("0 is a valid index"),
         ChildNumber::from_hardened_idx(index).expect("0 is a valid index"),
-    ])
+    ]))
 }
 
 #[cfg(test)]
@@ -601,7 +618,7 @@ mod tests {
             seed,
             2,
             CurrencyUnit::Sat,
-            derivation_path_from_unit(CurrencyUnit::Sat, 0),
+            derivation_path_from_unit(CurrencyUnit::Sat, 0).unwrap(),
         );
 
         assert_eq!(keyset.unit, CurrencyUnit::Sat);
@@ -645,7 +662,7 @@ mod tests {
             xpriv,
             2,
             CurrencyUnit::Sat,
-            derivation_path_from_unit(CurrencyUnit::Sat, 0),
+            derivation_path_from_unit(CurrencyUnit::Sat, 0).unwrap(),
         );
 
         assert_eq!(keyset.unit, CurrencyUnit::Sat);
@@ -725,6 +742,7 @@ mod tests {
             localstore,
             HashMap::new(),
             config.supported_units,
+            HashMap::new(),
         )
         .await
     }
@@ -780,7 +798,8 @@ mod tests {
         assert!(keysets.keysets.is_empty());
 
         // generate the first keyset and set it to active
-        mint.rotate_keyset(CurrencyUnit::default(), 0, 1, 1).await?;
+        mint.rotate_keyset(CurrencyUnit::default(), 0, 1, 1, HashMap::new())
+            .await?;
 
         let keysets = mint.keysets().await.unwrap();
         assert!(keysets.keysets.len().eq(&1));
@@ -788,7 +807,8 @@ mod tests {
         let first_keyset_id = keysets.keysets[0].id;
 
         // set the first keyset to inactive and generate a new keyset
-        mint.rotate_keyset(CurrencyUnit::default(), 1, 1, 1).await?;
+        mint.rotate_keyset(CurrencyUnit::default(), 1, 1, 1, HashMap::new())
+            .await?;
 
         let keysets = mint.keysets().await.unwrap();
 
diff --git a/crates/cdk/src/nuts/nut00/mod.rs b/crates/cdk/src/nuts/nut00/mod.rs
index d6c3dffd..929b0c05 100644
--- a/crates/cdk/src/nuts/nut00/mod.rs
+++ b/crates/cdk/src/nuts/nut00/mod.rs
@@ -361,7 +361,7 @@ where
 
 /// Currency Unit
 #[non_exhaustive]
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Default)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Default)]
 #[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
 pub enum CurrencyUnit {
     /// Sat
@@ -373,17 +373,20 @@ pub enum CurrencyUnit {
     Usd,
     /// Euro
     Eur,
+    /// Custom currency unit
+    Custom(String),
 }
 
 #[cfg(feature = "mint")]
 impl CurrencyUnit {
     /// Derivation index mint will use for unit
-    pub fn derivation_index(&self) -> u32 {
+    pub fn derivation_index(&self) -> Option<u32> {
         match self {
-            Self::Sat => 0,
-            Self::Msat => 1,
-            Self::Usd => 2,
-            Self::Eur => 3,
+            Self::Sat => Some(0),
+            Self::Msat => Some(1),
+            Self::Usd => Some(2),
+            Self::Eur => Some(3),
+            _ => None,
         }
     }
 }
@@ -391,12 +394,13 @@ impl CurrencyUnit {
 impl FromStr for CurrencyUnit {
     type Err = Error;
     fn from_str(value: &str) -> Result<Self, Self::Err> {
-        match value {
-            "sat" => Ok(Self::Sat),
-            "msat" => Ok(Self::Msat),
-            "usd" => Ok(Self::Usd),
-            "eur" => Ok(Self::Eur),
-            _ => Err(Error::UnsupportedUnit),
+        let value = &value.to_uppercase();
+        match value.as_str() {
+            "SAT" => Ok(Self::Sat),
+            "MSAT" => Ok(Self::Msat),
+            "USD" => Ok(Self::Usd),
+            "EUR" => Ok(Self::Eur),
+            c => Ok(Self::Custom(c.to_string())),
         }
     }
 }
@@ -404,15 +408,16 @@ impl FromStr for CurrencyUnit {
 impl fmt::Display for CurrencyUnit {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let s = match self {
-            CurrencyUnit::Sat => "sat",
-            CurrencyUnit::Msat => "msat",
-            CurrencyUnit::Usd => "usd",
-            CurrencyUnit::Eur => "eur",
+            CurrencyUnit::Sat => "SAT",
+            CurrencyUnit::Msat => "MSAT",
+            CurrencyUnit::Usd => "USD",
+            CurrencyUnit::Eur => "EUR",
+            CurrencyUnit::Custom(unit) => unit,
         };
         if let Some(width) = f.width() {
-            write!(f, "{:width$}", s, width = width)
+            write!(f, "{:width$}", s.to_lowercase(), width = width)
         } else {
-            write!(f, "{}", s)
+            write!(f, "{}", s.to_lowercase())
         }
     }
 }
diff --git a/crates/cdk/src/nuts/nut00/token.rs b/crates/cdk/src/nuts/nut00/token.rs
index 96e15302..dccd695b 100644
--- a/crates/cdk/src/nuts/nut00/token.rs
+++ b/crates/cdk/src/nuts/nut00/token.rs
@@ -92,8 +92,8 @@ impl Token {
     /// Unit
     pub fn unit(&self) -> Option<CurrencyUnit> {
         match self {
-            Self::TokenV3(token) => *token.unit(),
-            Self::TokenV4(token) => Some(token.unit()),
+            Self::TokenV3(token) => token.unit().clone(),
+            Self::TokenV4(token) => Some(token.unit().clone()),
         }
     }
 
@@ -326,8 +326,8 @@ impl TokenV4 {
 
     /// Unit
     #[inline]
-    pub fn unit(&self) -> CurrencyUnit {
-        self.unit
+    pub fn unit(&self) -> &CurrencyUnit {
+        &self.unit
     }
 }
 
@@ -525,7 +525,7 @@ mod tests {
             token.token[0].proofs[0].clone().keyset_id,
             Id::from_str("009a1f293253e41e").unwrap()
         );
-        assert_eq!(token.unit.unwrap(), CurrencyUnit::Sat);
+        assert_eq!(token.unit.clone().unwrap(), CurrencyUnit::Sat);
 
         let encoded = &token.to_string();
 
diff --git a/crates/cdk/src/nuts/nut03.rs b/crates/cdk/src/nuts/nut03.rs
index 535c89a9..cee5f063 100644
--- a/crates/cdk/src/nuts/nut03.rs
+++ b/crates/cdk/src/nuts/nut03.rs
@@ -32,11 +32,11 @@ pub struct PreSwap {
     pub fee: Amount,
 }
 
-/// Split Request [NUT-06]
+/// Swap Request [NUT-03]
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
 pub struct SwapRequest {
-    /// Proofs that are to be spent in `Split`
+    /// Proofs that are to be spent in a `Swap`
     #[cfg_attr(feature = "swagger", schema(value_type = Vec<Proof>))]
     pub inputs: Proofs,
     /// Blinded Messages for Mint to sign
diff --git a/crates/cdk/src/nuts/nut04.rs b/crates/cdk/src/nuts/nut04.rs
index 207a7a9a..40a6f8d4 100644
--- a/crates/cdk/src/nuts/nut04.rs
+++ b/crates/cdk/src/nuts/nut04.rs
@@ -137,7 +137,7 @@ pub struct MintBolt11Response {
 }
 
 /// Mint Method Settings
-#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
 #[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
 pub struct MintMethodSettings {
     /// Payment Method e.g. bolt11
@@ -179,7 +179,7 @@ impl Settings {
     ) -> Option<MintMethodSettings> {
         for method_settings in self.methods.iter() {
             if method_settings.method.eq(method) && method_settings.unit.eq(unit) {
-                return Some(*method_settings);
+                return Some(method_settings.clone());
             }
         }
 
diff --git a/crates/cdk/src/nuts/nut05.rs b/crates/cdk/src/nuts/nut05.rs
index 23cb4738..ff99a38e 100644
--- a/crates/cdk/src/nuts/nut05.rs
+++ b/crates/cdk/src/nuts/nut05.rs
@@ -252,7 +252,7 @@ impl MeltBolt11Request {
 }
 
 /// Melt Method Settings
-#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
 #[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
 pub struct MeltMethodSettings {
     /// Payment Method e.g. bolt11
@@ -281,7 +281,7 @@ impl Settings {
     ) -> Option<MeltMethodSettings> {
         for method_settings in self.methods.iter() {
             if method_settings.method.eq(method) && method_settings.unit.eq(unit) {
-                return Some(*method_settings);
+                return Some(method_settings.clone());
             }
         }
 
diff --git a/crates/cdk/src/nuts/nut09.rs b/crates/cdk/src/nuts/nut09.rs
index abcd8f85..5f04045f 100644
--- a/crates/cdk/src/nuts/nut09.rs
+++ b/crates/cdk/src/nuts/nut09.rs
@@ -22,6 +22,9 @@ pub struct RestoreResponse {
     pub outputs: Vec<BlindedMessage>,
     /// Signatures
     pub signatures: Vec<BlindSignature>,
+    /// Promises
+    // Temp compatibility with cashu-ts
+    pub promises: Option<Vec<BlindSignature>>,
 }
 
 mod test {
diff --git a/crates/cdk/src/nuts/nut18.rs b/crates/cdk/src/nuts/nut18.rs
index d165b148..cb19735e 100644
--- a/crates/cdk/src/nuts/nut18.rs
+++ b/crates/cdk/src/nuts/nut18.rs
@@ -154,7 +154,7 @@ mod tests {
 
         assert_eq!(&req.payment_id.unwrap(), "b7a90176");
         assert_eq!(req.amount.unwrap(), 10.into());
-        assert_eq!(req.unit.unwrap(), CurrencyUnit::Sat);
+        assert_eq!(req.unit.clone().unwrap(), CurrencyUnit::Sat);
         assert_eq!(
             req.mints.unwrap(),
             vec![MintUrl::from_str("https://nofees.testnut.cashu.space")?]
@@ -190,7 +190,7 @@ mod tests {
 
         assert_eq!(&req.payment_id.unwrap(), "b7a90176");
         assert_eq!(req.amount.unwrap(), 10.into());
-        assert_eq!(req.unit.unwrap(), CurrencyUnit::Sat);
+        assert_eq!(req.unit.clone().unwrap(), CurrencyUnit::Sat);
         assert_eq!(
             req.mints.unwrap(),
             vec![MintUrl::from_str("https://nofees.testnut.cashu.space")?]
diff --git a/crates/cdk/src/types.rs b/crates/cdk/src/types.rs
index 213a8e7e..e3d91eca 100644
--- a/crates/cdk/src/types.rs
+++ b/crates/cdk/src/types.rs
@@ -141,7 +141,7 @@ impl ProofInfo {
 
 /// Key used in hashmap of ln backends to identify what unit and payment method
 /// it is for
-#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]
 pub struct LnKey {
     /// Unit of Payment backend
     pub unit: CurrencyUnit,
diff --git a/crates/cdk/src/wallet/balance.rs b/crates/cdk/src/wallet/balance.rs
index 6d127646..46c814ac 100644
--- a/crates/cdk/src/wallet/balance.rs
+++ b/crates/cdk/src/wallet/balance.rs
@@ -19,7 +19,7 @@ impl Wallet {
 
         // TODO If only the proofs for this wallet's unit are retrieved, why build a map with key = unit?
         let balances = proofs.iter().fold(HashMap::new(), |mut acc, proof| {
-            *acc.entry(self.unit).or_insert(Amount::ZERO) += proof.amount;
+            *acc.entry(self.unit.clone()).or_insert(Amount::ZERO) += proof.amount;
             acc
         });
 
@@ -33,7 +33,7 @@ impl Wallet {
 
         // TODO If only the proofs for this wallet's unit are retrieved, why build a map with key = unit?
         let balances = proofs.iter().fold(HashMap::new(), |mut acc, proof| {
-            *acc.entry(self.unit).or_insert(Amount::ZERO) += proof.amount;
+            *acc.entry(self.unit.clone()).or_insert(Amount::ZERO) += proof.amount;
             acc
         });
 
diff --git a/crates/cdk/src/wallet/client.rs b/crates/cdk/src/wallet/client.rs
index d5b413ce..4296e6c2 100644
--- a/crates/cdk/src/wallet/client.rs
+++ b/crates/cdk/src/wallet/client.rs
@@ -1,5 +1,8 @@
 //! Wallet client
 
+use std::fmt::Debug;
+
+use async_trait::async_trait;
 use reqwest::Client;
 use serde_json::Value;
 use tracing::instrument;
@@ -8,15 +11,12 @@ use url::Url;
 use super::Error;
 use crate::error::ErrorResponse;
 use crate::mint_url::MintUrl;
-use crate::nuts::nut15::Mpp;
 use crate::nuts::{
-    BlindedMessage, CheckStateRequest, CheckStateResponse, CurrencyUnit, Id, KeySet, KeysResponse,
-    KeysetResponse, MeltBolt11Request, MeltQuoteBolt11Request, MeltQuoteBolt11Response,
-    MintBolt11Request, MintBolt11Response, MintInfo, MintQuoteBolt11Request,
-    MintQuoteBolt11Response, PreMintSecrets, Proof, PublicKey, RestoreRequest, RestoreResponse,
-    SwapRequest, SwapResponse,
+    CheckStateRequest, CheckStateResponse, Id, KeySet, KeysResponse, KeysetResponse,
+    MeltBolt11Request, MeltQuoteBolt11Request, MeltQuoteBolt11Response, MintBolt11Request,
+    MintBolt11Response, MintInfo, MintQuoteBolt11Request, MintQuoteBolt11Response, RestoreRequest,
+    RestoreResponse, SwapRequest, SwapResponse,
 };
-use crate::{Amount, Bolt11Invoice};
 
 /// Http Client
 #[derive(Debug, Clone)]
@@ -67,10 +67,14 @@ impl HttpClient {
 
         Ok(Self { inner: client })
     }
+}
 
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+impl HttpClientMethods for HttpClient {
     /// Get Active Mint Keys [NUT-01]
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_mint_keys(&self, mint_url: MintUrl) -> Result<Vec<KeySet>, Error> {
+    async fn get_mint_keys(&self, mint_url: MintUrl) -> Result<Vec<KeySet>, Error> {
         let url = mint_url.join_paths(&["v1", "keys"])?;
         let keys = self.inner.get(url).send().await?.json::<Value>().await?;
 
@@ -82,7 +86,7 @@ impl HttpClient {
 
     /// Get Keyset Keys [NUT-01]
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_mint_keyset(&self, mint_url: MintUrl, keyset_id: Id) -> Result<KeySet, Error> {
+    async fn get_mint_keyset(&self, mint_url: MintUrl, keyset_id: Id) -> Result<KeySet, Error> {
         let url = mint_url.join_paths(&["v1", "keys", &keyset_id.to_string()])?;
         let keys = self.inner.get(url).send().await?.json::<Value>().await?;
 
@@ -94,7 +98,7 @@ impl HttpClient {
 
     /// Get Keysets [NUT-02]
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_mint_keysets(&self, mint_url: MintUrl) -> Result<KeysetResponse, Error> {
+    async fn get_mint_keysets(&self, mint_url: MintUrl) -> Result<KeysetResponse, Error> {
         let url = mint_url.join_paths(&["v1", "keysets"])?;
         let res = self.inner.get(url).send().await?.json::<Value>().await?;
 
@@ -106,21 +110,13 @@ impl HttpClient {
 
     /// Mint Quote [NUT-04]
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn post_mint_quote(
+    async fn post_mint_quote(
         &self,
         mint_url: MintUrl,
-        amount: Amount,
-        unit: CurrencyUnit,
-        description: Option<String>,
+        request: MintQuoteBolt11Request,
     ) -> Result<MintQuoteBolt11Response, Error> {
         let url = mint_url.join_paths(&["v1", "mint", "quote", "bolt11"])?;
 
-        let request = MintQuoteBolt11Request {
-            amount,
-            unit,
-            description,
-        };
-
         let res = self
             .inner
             .post(url)
@@ -141,7 +137,7 @@ impl HttpClient {
 
     /// Mint Quote status
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_mint_quote_status(
+    async fn get_mint_quote_status(
         &self,
         mint_url: MintUrl,
         quote_id: &str,
@@ -160,20 +156,14 @@ impl HttpClient {
     }
 
     /// Mint Tokens [NUT-04]
-    #[instrument(skip(self, quote, premint_secrets), fields(mint_url = %mint_url))]
-    pub async fn post_mint(
+    #[instrument(skip(self, request), fields(mint_url = %mint_url))]
+    async fn post_mint(
         &self,
         mint_url: MintUrl,
-        quote: &str,
-        premint_secrets: PreMintSecrets,
+        request: MintBolt11Request,
     ) -> Result<MintBolt11Response, Error> {
         let url = mint_url.join_paths(&["v1", "mint", "bolt11"])?;
 
-        let request = MintBolt11Request {
-            quote: quote.to_string(),
-            outputs: premint_secrets.blinded_messages(),
-        };
-
         let res = self
             .inner
             .post(url)
@@ -191,23 +181,13 @@ impl HttpClient {
 
     /// Melt Quote [NUT-05]
     #[instrument(skip(self, request), fields(mint_url = %mint_url))]
-    pub async fn post_melt_quote(
+    async fn post_melt_quote(
         &self,
         mint_url: MintUrl,
-        unit: CurrencyUnit,
-        request: Bolt11Invoice,
-        mpp_amount: Option<Amount>,
+        request: MeltQuoteBolt11Request,
     ) -> Result<MeltQuoteBolt11Response, Error> {
         let url = mint_url.join_paths(&["v1", "melt", "quote", "bolt11"])?;
 
-        let options = mpp_amount.map(|amount| Mpp { amount });
-
-        let request = MeltQuoteBolt11Request {
-            request,
-            unit,
-            options,
-        };
-
         let res = self
             .inner
             .post(url)
@@ -225,7 +205,7 @@ impl HttpClient {
 
     /// Melt Quote Status
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_melt_quote_status(
+    async fn get_melt_quote_status(
         &self,
         mint_url: MintUrl,
         quote_id: &str,
@@ -242,22 +222,14 @@ impl HttpClient {
 
     /// Melt [NUT-05]
     /// [Nut-08] Lightning fee return if outputs defined
-    #[instrument(skip(self, quote, inputs, outputs), fields(mint_url = %mint_url))]
-    pub async fn post_melt(
+    #[instrument(skip(self, request), fields(mint_url = %mint_url))]
+    async fn post_melt(
         &self,
         mint_url: MintUrl,
-        quote: String,
-        inputs: Vec<Proof>,
-        outputs: Option<Vec<BlindedMessage>>,
+        request: MeltBolt11Request,
     ) -> Result<MeltQuoteBolt11Response, Error> {
         let url = mint_url.join_paths(&["v1", "melt", "bolt11"])?;
 
-        let request = MeltBolt11Request {
-            quote,
-            inputs,
-            outputs,
-        };
-
         let res = self
             .inner
             .post(url)
@@ -278,9 +250,9 @@ impl HttpClient {
         }
     }
 
-    /// Split Token [NUT-06]
+    /// Swap Token [NUT-03]
     #[instrument(skip(self, swap_request), fields(mint_url = %mint_url))]
-    pub async fn post_swap(
+    async fn post_swap(
         &self,
         mint_url: MintUrl,
         swap_request: SwapRequest,
@@ -304,7 +276,7 @@ impl HttpClient {
 
     /// Get Mint Info [NUT-06]
     #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn get_mint_info(&self, mint_url: MintUrl) -> Result<MintInfo, Error> {
+    async fn get_mint_info(&self, mint_url: MintUrl) -> Result<MintInfo, Error> {
         let url = mint_url.join_paths(&["v1", "info"])?;
 
         let res = self.inner.get(url).send().await?.json::<Value>().await?;
@@ -319,14 +291,13 @@ impl HttpClient {
     }
 
     /// Spendable check [NUT-07]
-    #[instrument(skip(self), fields(mint_url = %mint_url))]
-    pub async fn post_check_state(
+    #[instrument(skip(self, request), fields(mint_url = %mint_url))]
+    async fn post_check_state(
         &self,
         mint_url: MintUrl,
-        ys: Vec<PublicKey>,
+        request: CheckStateRequest,
     ) -> Result<CheckStateResponse, Error> {
         let url = mint_url.join_paths(&["v1", "checkstate"])?;
-        let request = CheckStateRequest { ys };
 
         let res = self
             .inner
@@ -345,7 +316,7 @@ impl HttpClient {
 
     /// Restore request [NUT-13]
     #[instrument(skip(self, request), fields(mint_url = %mint_url))]
-    pub async fn post_restore(
+    async fn post_restore(
         &self,
         mint_url: MintUrl,
         request: RestoreRequest,
@@ -367,3 +338,84 @@ impl HttpClient {
         }
     }
 }
+
+/// Http Client Methods
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+pub trait HttpClientMethods: Debug {
+    /// Get Active Mint Keys [NUT-01]
+    async fn get_mint_keys(&self, mint_url: MintUrl) -> Result<Vec<KeySet>, Error>;
+
+    /// Get Keyset Keys [NUT-01]
+    async fn get_mint_keyset(&self, mint_url: MintUrl, keyset_id: Id) -> Result<KeySet, Error>;
+
+    /// Get Keysets [NUT-02]
+    async fn get_mint_keysets(&self, mint_url: MintUrl) -> Result<KeysetResponse, Error>;
+
+    /// Mint Quote [NUT-04]
+    async fn post_mint_quote(
+        &self,
+        mint_url: MintUrl,
+        request: MintQuoteBolt11Request,
+    ) -> Result<MintQuoteBolt11Response, Error>;
+
+    /// Mint Quote status
+    async fn get_mint_quote_status(
+        &self,
+        mint_url: MintUrl,
+        quote_id: &str,
+    ) -> Result<MintQuoteBolt11Response, Error>;
+
+    /// Mint Tokens [NUT-04]
+    async fn post_mint(
+        &self,
+        mint_url: MintUrl,
+        request: MintBolt11Request,
+    ) -> Result<MintBolt11Response, Error>;
+
+    /// Melt Quote [NUT-05]
+    async fn post_melt_quote(
+        &self,
+        mint_url: MintUrl,
+        request: MeltQuoteBolt11Request,
+    ) -> Result<MeltQuoteBolt11Response, Error>;
+
+    /// Melt Quote Status
+    async fn get_melt_quote_status(
+        &self,
+        mint_url: MintUrl,
+        quote_id: &str,
+    ) -> Result<MeltQuoteBolt11Response, Error>;
+
+    /// Melt [NUT-05]
+    /// [Nut-08] Lightning fee return if outputs defined
+    async fn post_melt(
+        &self,
+        mint_url: MintUrl,
+        request: MeltBolt11Request,
+    ) -> Result<MeltQuoteBolt11Response, Error>;
+
+    /// Split Token [NUT-06]
+    async fn post_swap(
+        &self,
+        mint_url: MintUrl,
+        request: SwapRequest,
+    ) -> Result<SwapResponse, Error>;
+
+    /// Get Mint Info [NUT-06]
+    async fn get_mint_info(&self, mint_url: MintUrl) -> Result<MintInfo, Error>;
+
+    /// Spendable check [NUT-07]
+    async fn post_check_state(
+        &self,
+        mint_url: MintUrl,
+        request: CheckStateRequest,
+    ) -> Result<CheckStateResponse, Error>;
+
+    /// Restore request [NUT-13]
+    async fn post_restore(
+        &self,
+        mint_url: MintUrl,
+        request: RestoreRequest,
+    ) -> Result<RestoreResponse, Error>;
+}
diff --git a/crates/cdk/src/wallet/melt.rs b/crates/cdk/src/wallet/melt.rs
index c31f2ff4..4948ecd3 100644
--- a/crates/cdk/src/wallet/melt.rs
+++ b/crates/cdk/src/wallet/melt.rs
@@ -4,6 +4,7 @@ use lightning_invoice::Bolt11Invoice;
 use tracing::instrument;
 
 use crate::nuts::nut00::ProofsMethods;
+use crate::nuts::{MeltBolt11Request, MeltQuoteBolt11Request, Mpp};
 use crate::{
     dhke::construct_proofs,
     nuts::{CurrencyUnit, MeltQuoteBolt11Response, PreMintSecrets, Proofs, State},
@@ -57,9 +58,17 @@ impl Wallet {
             _ => return Err(Error::UnitUnsupported),
         };
 
+        let options = mpp.map(|amount| Mpp { amount });
+
+        let quote_request = MeltQuoteBolt11Request {
+            request: Bolt11Invoice::from_str(&request)?,
+            unit: self.unit.clone(),
+            options,
+        };
+
         let quote_res = self
             .client
-            .post_melt_quote(self.mint_url.clone(), self.unit, invoice, mpp)
+            .post_melt_quote(self.mint_url.clone(), quote_request)
             .await?;
 
         if quote_res.amount != amount {
@@ -70,7 +79,7 @@ impl Wallet {
             id: quote_res.quote,
             amount,
             request,
-            unit: self.unit,
+            unit: self.unit.clone(),
             fee_reserve: quote_res.fee_reserve,
             state: quote_res.state,
             expiry: quote_res.expiry,
@@ -146,15 +155,13 @@ impl Wallet {
             proofs_total - quote_info.amount,
         )?;
 
-        let melt_response = self
-            .client
-            .post_melt(
-                self.mint_url.clone(),
-                quote_id.to_string(),
-                proofs.clone(),
-                Some(premint_secrets.blinded_messages()),
-            )
-            .await;
+        let request = MeltBolt11Request {
+            quote: quote_id.to_string(),
+            inputs: proofs.clone(),
+            outputs: Some(premint_secrets.blinded_messages()),
+        };
+
+        let melt_response = self.client.post_melt(self.mint_url.clone(), request).await;
 
         let melt_response = match melt_response {
             Ok(melt_response) => melt_response,
@@ -226,7 +233,7 @@ impl Wallet {
                             proof,
                             self.mint_url.clone(),
                             State::Unspent,
-                            quote_info.unit,
+                            quote_info.unit.clone(),
                         )
                     })
                     .collect::<Result<Vec<ProofInfo>, _>>()?
diff --git a/crates/cdk/src/wallet/mint.rs b/crates/cdk/src/wallet/mint.rs
index b429daaf..743044f0 100644
--- a/crates/cdk/src/wallet/mint.rs
+++ b/crates/cdk/src/wallet/mint.rs
@@ -2,6 +2,7 @@ use tracing::instrument;
 
 use super::MintQuote;
 use crate::nuts::nut00::ProofsMethods;
+use crate::nuts::{MintBolt11Request, MintQuoteBolt11Request};
 use crate::{
     amount::SplitTarget,
     dhke::construct_proofs,
@@ -45,7 +46,7 @@ impl Wallet {
         description: Option<String>,
     ) -> Result<MintQuote, Error> {
         let mint_url = self.mint_url.clone();
-        let unit = self.unit;
+        let unit = self.unit.clone();
 
         // If we have a description, we check that the mint supports it.
         if description.is_some() {
@@ -64,16 +65,22 @@ impl Wallet {
             }
         }
 
+        let request = MintQuoteBolt11Request {
+            amount,
+            unit: unit.clone(),
+            description,
+        };
+
         let quote_res = self
             .client
-            .post_mint_quote(mint_url.clone(), amount, unit, description)
+            .post_mint_quote(mint_url.clone(), request)
             .await?;
 
         let quote = MintQuote {
             mint_url,
             id: quote_res.quote.clone(),
             amount,
-            unit,
+            unit: unit.clone(),
             request: quote_res.request,
             state: quote_res.state,
             expiry: quote_res.expiry.unwrap_or(0),
@@ -212,9 +219,14 @@ impl Wallet {
             )?,
         };
 
+        let request = MintBolt11Request {
+            quote: quote_id.to_string(),
+            outputs: premint_secrets.blinded_messages(),
+        };
+
         let mint_res = self
             .client
-            .post_mint(self.mint_url.clone(), quote_id, premint_secrets.clone())
+            .post_mint(self.mint_url.clone(), request)
             .await?;
 
         let keys = self.get_keyset_keys(active_keyset_id).await?;
@@ -257,7 +269,7 @@ impl Wallet {
                     proof,
                     self.mint_url.clone(),
                     State::Unspent,
-                    quote_info.unit,
+                    quote_info.unit.clone(),
                 )
             })
             .collect::<Result<Vec<ProofInfo>, _>>()?;
diff --git a/crates/cdk/src/wallet/mod.rs b/crates/cdk/src/wallet/mod.rs
index 85045eaa..7b8de868 100644
--- a/crates/cdk/src/wallet/mod.rs
+++ b/crates/cdk/src/wallet/mod.rs
@@ -6,6 +6,7 @@ use std::sync::Arc;
 
 use bitcoin::bip32::Xpriv;
 use bitcoin::Network;
+use client::HttpClientMethods;
 use tracing::instrument;
 
 use crate::amount::SplitTarget;
@@ -55,7 +56,7 @@ pub struct Wallet {
     /// The targeted amount of proofs to have at each size
     pub target_proof_count: usize,
     xpriv: Xpriv,
-    client: HttpClient,
+    client: Arc<dyn HttpClientMethods + Send + Sync>,
 }
 
 impl Wallet {
@@ -88,7 +89,7 @@ impl Wallet {
         Ok(Self {
             mint_url: MintUrl::from_str(mint_url)?,
             unit,
-            client: HttpClient::new(),
+            client: Arc::new(HttpClient::new()),
             localstore,
             xpriv,
             target_proof_count: target_proof_count.unwrap_or(3),
@@ -96,8 +97,8 @@ impl Wallet {
     }
 
     /// Change HTTP client
-    pub fn set_client(&mut self, client: HttpClient) {
-        self.client = client;
+    pub fn set_client<C: HttpClientMethods + 'static + Send + Sync>(&mut self, client: C) {
+        self.client = Arc::new(client);
     }
 
     /// Fee required for proof set
@@ -329,7 +330,12 @@ impl Wallet {
                 let unspent_proofs = unspent_proofs
                     .into_iter()
                     .map(|proof| {
-                        ProofInfo::new(proof, self.mint_url.clone(), State::Unspent, keyset.unit)
+                        ProofInfo::new(
+                            proof,
+                            self.mint_url.clone(),
+                            State::Unspent,
+                            keyset.unit.clone(),
+                        )
                     })
                     .collect::<Result<Vec<ProofInfo>, _>>()?;
 
diff --git a/crates/cdk/src/wallet/multi_mint_wallet.rs b/crates/cdk/src/wallet/multi_mint_wallet.rs
index 8d26e9e4..b0f048b2 100644
--- a/crates/cdk/src/wallet/multi_mint_wallet.rs
+++ b/crates/cdk/src/wallet/multi_mint_wallet.rs
@@ -55,7 +55,7 @@ impl MultiMintWallet {
             wallets: Arc::new(Mutex::new(
                 wallets
                     .into_iter()
-                    .map(|w| (WalletKey::new(w.mint_url.clone(), w.unit), w))
+                    .map(|w| (WalletKey::new(w.mint_url.clone(), w.unit.clone()), w))
                     .collect(),
             )),
         }
@@ -64,7 +64,7 @@ impl MultiMintWallet {
     /// Add wallet to MultiMintWallet
     #[instrument(skip(self, wallet))]
     pub async fn add_wallet(&self, wallet: Wallet) {
-        let wallet_key = WalletKey::new(wallet.mint_url.clone(), wallet.unit);
+        let wallet_key = WalletKey::new(wallet.mint_url.clone(), wallet.unit.clone());
 
         let mut wallets = self.wallets.lock().await;
 
@@ -126,7 +126,7 @@ impl MultiMintWallet {
 
         for (WalletKey { mint_url, unit: u }, wallet) in self.wallets.lock().await.iter() {
             let wallet_proofs = wallet.get_unspent_proofs().await?;
-            mint_proofs.insert(mint_url.clone(), (wallet_proofs, *u));
+            mint_proofs.insert(mint_url.clone(), (wallet_proofs, u.clone()));
         }
         Ok(mint_proofs)
     }
@@ -198,7 +198,7 @@ impl MultiMintWallet {
                     let amount = wallet.check_all_mint_quotes().await?;
 
                     amount_minted
-                        .entry(wallet.unit)
+                        .entry(wallet.unit.clone())
                         .and_modify(|b| *b += amount)
                         .or_insert(amount);
                 }
@@ -246,7 +246,7 @@ impl MultiMintWallet {
         let mint_url = token_data.mint_url()?;
 
         // Check that all mints in tokes have wallets
-        let wallet_key = WalletKey::new(mint_url.clone(), unit);
+        let wallet_key = WalletKey::new(mint_url.clone(), unit.clone());
         if !self.has(&wallet_key).await {
             return Err(Error::UnknownWallet(wallet_key.clone()));
         }
diff --git a/crates/cdk/src/wallet/proofs.rs b/crates/cdk/src/wallet/proofs.rs
index 12fed0ef..fd67015a 100644
--- a/crates/cdk/src/wallet/proofs.rs
+++ b/crates/cdk/src/wallet/proofs.rs
@@ -3,6 +3,7 @@ use std::collections::HashSet;
 use tracing::instrument;
 
 use crate::nuts::nut00::ProofsMethods;
+use crate::nuts::CheckStateRequest;
 use crate::{
     amount::SplitTarget,
     nuts::{Proof, ProofState, Proofs, PublicKey, SpendingConditions, State},
@@ -40,7 +41,7 @@ impl Wallet {
             .localstore
             .get_proofs(
                 Some(self.mint_url.clone()),
-                Some(self.unit),
+                Some(self.unit.clone()),
                 state,
                 spending_conditions,
             )
@@ -65,7 +66,7 @@ impl Wallet {
 
         let spendable = self
             .client
-            .post_check_state(self.mint_url.clone(), proof_ys)
+            .post_check_state(self.mint_url.clone(), CheckStateRequest { ys: proof_ys })
             .await?
             .states;
 
@@ -86,7 +87,10 @@ impl Wallet {
     pub async fn check_proofs_spent(&self, proofs: Proofs) -> Result<Vec<ProofState>, Error> {
         let spendable = self
             .client
-            .post_check_state(self.mint_url.clone(), proofs.ys()?)
+            .post_check_state(
+                self.mint_url.clone(),
+                CheckStateRequest { ys: proofs.ys()? },
+            )
             .await?;
         let spent_ys: Vec<_> = spendable
             .states
@@ -111,7 +115,7 @@ impl Wallet {
             .localstore
             .get_proofs(
                 Some(self.mint_url.clone()),
-                Some(self.unit),
+                Some(self.unit.clone()),
                 Some(vec![State::Pending, State::Reserved]),
                 None,
             )
diff --git a/crates/cdk/src/wallet/receive.rs b/crates/cdk/src/wallet/receive.rs
index d5999232..2a594b1f 100644
--- a/crates/cdk/src/wallet/receive.rs
+++ b/crates/cdk/src/wallet/receive.rs
@@ -111,7 +111,7 @@ impl Wallet {
         let proofs_info = proofs
             .clone()
             .into_iter()
-            .map(|p| ProofInfo::new(p, self.mint_url.clone(), State::Pending, self.unit))
+            .map(|p| ProofInfo::new(p, self.mint_url.clone(), State::Pending, self.unit.clone()))
             .collect::<Result<Vec<ProofInfo>, _>>()?;
         self.localstore
             .update_proofs(proofs_info.clone(), vec![])
@@ -150,7 +150,7 @@ impl Wallet {
 
         let recv_proof_infos = recv_proofs
             .into_iter()
-            .map(|proof| ProofInfo::new(proof, mint_url.clone(), State::Unspent, self.unit))
+            .map(|proof| ProofInfo::new(proof, mint_url.clone(), State::Unspent, self.unit.clone()))
             .collect::<Result<Vec<ProofInfo>, _>>()?;
         self.localstore
             .update_proofs(
diff --git a/crates/cdk/src/wallet/send.rs b/crates/cdk/src/wallet/send.rs
index 7885db5c..0c6e7b79 100644
--- a/crates/cdk/src/wallet/send.rs
+++ b/crates/cdk/src/wallet/send.rs
@@ -16,7 +16,12 @@ impl Wallet {
         let ys = proofs.ys()?;
         self.localstore.reserve_proofs(ys).await?;
 
-        Ok(Token::new(self.mint_url.clone(), proofs, memo, self.unit))
+        Ok(Token::new(
+            self.mint_url.clone(),
+            proofs,
+            memo,
+            self.unit.clone(),
+        ))
     }
 
     /// Send
diff --git a/crates/cdk/src/wallet/swap.rs b/crates/cdk/src/wallet/swap.rs
index 043d37c5..650ceac9 100644
--- a/crates/cdk/src/wallet/swap.rs
+++ b/crates/cdk/src/wallet/swap.rs
@@ -111,7 +111,9 @@ impl Wallet {
                 let send_proofs_info = proofs_to_send
                     .clone()
                     .into_iter()
-                    .map(|proof| ProofInfo::new(proof, mint_url.clone(), State::Reserved, *unit))
+                    .map(|proof| {
+                        ProofInfo::new(proof, mint_url.clone(), State::Reserved, unit.clone())
+                    })
                     .collect::<Result<Vec<ProofInfo>, _>>()?;
                 added_proofs = send_proofs_info;
 
@@ -126,7 +128,7 @@ impl Wallet {
 
         let keep_proofs = change_proofs
             .into_iter()
-            .map(|proof| ProofInfo::new(proof, mint_url.clone(), State::Unspent, *unit))
+            .map(|proof| ProofInfo::new(proof, mint_url.clone(), State::Unspent, unit.clone()))
             .collect::<Result<Vec<ProofInfo>, _>>()?;
         added_proofs.extend(keep_proofs);
 
@@ -154,7 +156,7 @@ impl Wallet {
             .localstore
             .get_proofs(
                 Some(self.mint_url.clone()),
-                Some(self.unit),
+                Some(self.unit.clone()),
                 Some(vec![State::Unspent]),
                 None,
             )
diff --git a/flake.lock b/flake.lock
index d8d8de91..14dc9544 100644
--- a/flake.lock
+++ b/flake.lock
@@ -57,11 +57,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730137625,
-        "narHash": "sha256-9z8oOgFZiaguj+bbi3k4QhAD6JabWrnv7fscC/mt0KE=",
+        "lastModified": 1730741070,
+        "narHash": "sha256-edm8WG19kWozJ/GqyYx2VjW99EdhjKwbY3ZwdlPAAlo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "64b80bfb316b57cdb8919a9110ef63393d74382a",
+        "rev": "d063c1dd113c91ab27959ba540c0d9753409edf3",
         "type": "github"
       },
       "original": {
@@ -139,11 +139,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1730341826,
-        "narHash": "sha256-RFaeY7EWzXOmAL2IQEACbnrEza3TgD5UQApHR4hGHhY=",
+        "lastModified": 1730687492,
+        "narHash": "sha256-xQVadjquBA/tFxDt5A55LJ1D1AvkVWsnrKC2o+pr8F4=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "815d1b3ee71716fc91a7bd149801e1f04d45fbc5",
+        "rev": "41814763a2c597755b0755dbe3e721367a5e420f",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index b4078557..dc67d02e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,7 +37,7 @@
 
         # Toolchains
         # latest stable
-        stable_toolchain = pkgs.rust-bin.stable.latest.default.override {
+        stable_toolchain = pkgs.rust-bin.stable."1.82.0".default.override {
           targets = [ "wasm32-unknown-unknown" ]; # wasm
         };
 
@@ -63,7 +63,7 @@
           pkg-config
           curl
           just
-          protobuf3_20
+          protobuf
           nixpkgs-fmt
           rust-analyzer
           typos
@@ -139,6 +139,7 @@
               cargo update -p bumpalo --precise 3.12.0
               cargo update -p moka --precise 0.11.1
               cargo update -p triomphe --precise 0.1.11
+              cargo update -p url --precise 2.5.2
               ";
               buildInputs = buildInputs ++ WASMInputs ++ [ msrv_toolchain ];
               inherit nativeBuildInputs;
@@ -160,6 +161,7 @@
               cargo update -p tokio-stream --precise 0.1.15
               cargo update -p serde_with --precise 3.1.0
               cargo update -p reqwest --precise 0.12.4
+              cargo update -p url --precise 2.5.2
               ";
               buildInputs = buildInputs ++ WASMInputs ++ [ db_msrv_toolchain ];
               inherit nativeBuildInputs;
diff --git a/justfile b/justfile
index 552d46e6..4e36977e 100644
--- a/justfile
+++ b/justfile
@@ -45,7 +45,7 @@ test: build
   if [ ! -f Cargo.toml ]; then
     cd {{invocation_directory()}}
   fi
-  cargo test
+  cargo test --lib
 
 # run `cargo clippy` on everything
 clippy *ARGS="--locked --offline --workspace --all-targets":
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 00000000..7f4575e0
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel="1.82.0"
+components = ["rustfmt", "clippy", "rust-analyzer"]
+