diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 07eb7208..52c48d99 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,8 +12,9 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.10"]
         poetry-version: ["1.5.1"]
+        mint-cache-secrets: ["true", "false"]
         # db-url: ["", "postgres://cashu:cashu@localhost:5432/test"] # TODO: Postgres test not working
         db-url: [""]
         backend-wallet-class: ["FakeWallet"]
@@ -21,6 +22,7 @@ jobs:
     with:
       python-version: ${{ matrix.python-version }}
       poetry-version: ${{ matrix.poetry-version }}
+      mint-cache-secrets: ${{ matrix.mint-cache-secrets }}
   regtest:
     uses: ./.github/workflows/regtest.yml
     strategy:
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 2889b52e..927f5674 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,6 +15,9 @@ on:
       os:
         default: "ubuntu-latest"
         type: string
+      mint-cache-secrets:
+        default: "false"
+        type: string
 
 jobs:
   poetry:
@@ -47,6 +50,7 @@ jobs:
           MINT_HOST: localhost
           MINT_PORT: 3337
           MINT_DATABASE: ${{ inputs.db-url }}
+          MINT_CACHE_SECRETS: ${{ inputs.mint-cache-secrets }}
           TOR: false
         run: |
           make test
diff --git a/cashu/core/base.py b/cashu/core/base.py
index 76492cf7..b5e14f8d 100644
--- a/cashu/core/base.py
+++ b/cashu/core/base.py
@@ -348,6 +348,11 @@ def __init__(
         self.public_keys = public_keys
         # overwrite id by deriving it from the public keys
         self.id = derive_keyset_id(self.public_keys)
+        logger.trace(f"Derived keyset id {self.id} from public keys.")
+        if id and id != self.id:
+            logger.warning(
+                f"WARNING: Keyset id {self.id} does not match the given id {id}."
+            )
 
     def serialize(self):
         return json.dumps(
@@ -356,9 +361,9 @@ def serialize(self):
 
     @classmethod
     def from_row(cls, row: Row):
-        def deserialize(serialized: str):
+        def deserialize(serialized: str) -> Dict[int, PublicKey]:
             return {
-                amount: PublicKey(bytes.fromhex(hex_key), raw=True)
+                int(amount): PublicKey(bytes.fromhex(hex_key), raw=True)
                 for amount, hex_key in dict(json.loads(serialized)).items()
             }
 
diff --git a/cashu/core/db.py b/cashu/core/db.py
index e2f99d88..b4337cca 100644
--- a/cashu/core/db.py
+++ b/cashu/core/db.py
@@ -5,6 +5,7 @@
 from contextlib import asynccontextmanager
 from typing import Optional, Union
 
+from loguru import logger
 from sqlalchemy import create_engine
 from sqlalchemy_aio.base import AsyncConnection
 from sqlalchemy_aio.strategy import ASYNCIO_STRATEGY  # type: ignore
@@ -130,7 +131,7 @@ def _parse_timestamp(value, _):
             # )
         else:
             if not os.path.exists(self.db_location):
-                print(f"Creating database directory: {self.db_location}")
+                logger.info(f"Creating database directory: {self.db_location}")
                 os.makedirs(self.db_location)
             self.path = os.path.join(self.db_location, f"{self.name}.sqlite3")
             database_uri = f"sqlite:///{self.path}"
diff --git a/cashu/core/settings.py b/cashu/core/settings.py
index 274e1098..d4ff75b7 100644
--- a/cashu/core/settings.py
+++ b/cashu/core/settings.py
@@ -44,6 +44,7 @@ class EnvSettings(CashuSettings):
     debug: bool = Field(default=False)
     log_level: str = Field(default="INFO")
     cashu_dir: str = Field(default=os.path.join(str(Path.home()), ".cashu"))
+    debug_profiling: bool = Field(default=False)
 
 
 class MintSettings(CashuSettings):
@@ -56,10 +57,13 @@ class MintSettings(CashuSettings):
     mint_peg_out_only: bool = Field(default=False)
     mint_max_peg_in: int = Field(default=None)
     mint_max_peg_out: int = Field(default=None)
+    mint_max_balance: int = Field(default=None)
 
     mint_lnbits_endpoint: str = Field(default=None)
     mint_lnbits_key: str = Field(default=None)
 
+    mint_cache_secrets: bool = Field(default=True)
+
 
 class MintInformation(CashuSettings):
     mint_info_name: str = Field(default="Cashu mint")
diff --git a/cashu/mint/app.py b/cashu/mint/app.py
index 895945e8..0de2d096 100644
--- a/cashu/mint/app.py
+++ b/cashu/mint/app.py
@@ -8,8 +8,6 @@
 )
 from fastapi.exceptions import RequestValidationError
 from fastapi.responses import JSONResponse
-
-# from fastapi_profiler import PyInstrumentProfilerMiddleware
 from loguru import logger
 from starlette.middleware import Middleware
 from starlette.middleware.cors import CORSMiddleware
@@ -20,6 +18,9 @@
 from .router import router
 from .startup import start_mint_init
 
+if settings.debug_profiling:
+    from fastapi_profiler import PyInstrumentProfilerMiddleware
+
 # from starlette_context import context
 # from starlette_context.middleware import RawContextMiddleware
 
@@ -108,7 +109,9 @@ def emit(self, record):
         middleware=middleware,
     )
 
-    # app.add_middleware(PyInstrumentProfilerMiddleware)
+    if settings.debug_profiling:
+        assert PyInstrumentProfilerMiddleware is not None
+        app.add_middleware(PyInstrumentProfilerMiddleware)
 
     return app
 
diff --git a/cashu/mint/crud.py b/cashu/mint/crud.py
index 5a189710..8797dc20 100644
--- a/cashu/mint/crud.py
+++ b/cashu/mint/crud.py
@@ -31,7 +31,7 @@ async def get_lightning_invoice(
         db: Database,
         id: str,
         conn: Optional[Connection] = None,
-    ):
+    ) -> Optional[Invoice]:
         return await get_lightning_invoice(
             db=db,
             id=id,
@@ -42,8 +42,23 @@ async def get_secrets_used(
         self,
         db: Database,
         conn: Optional[Connection] = None,
-    ):
-        return await get_secrets_used(db=db, conn=conn)
+    ) -> List[str]:
+        return await get_secrets_used(
+            db=db,
+            conn=conn,
+        )
+
+    async def get_proof_used(
+        self,
+        db: Database,
+        proof: Proof,
+        conn: Optional[Connection] = None,
+    ) -> Optional[Proof]:
+        return await get_proof_used(
+            db=db,
+            proof=proof,
+            conn=conn,
+        )
 
     async def invalidate_proof(
         self,
@@ -158,6 +173,16 @@ async def update_lightning_invoice(
             conn=conn,
         )
 
+    async def get_balance(
+        self,
+        db: Database,
+        conn: Optional[Connection] = None,
+    ) -> int:
+        return await get_balance(
+            db=db,
+            conn=conn,
+        )
+
 
 async def store_promise(
     *,
@@ -205,7 +230,7 @@ async def get_promise(
 async def get_secrets_used(
     db: Database,
     conn: Optional[Connection] = None,
-):
+) -> List[str]:
     rows = await (conn or db).fetchall(f"""
         SELECT secret from {table_with_schema(db, 'proofs_used')}
         """)
@@ -243,6 +268,21 @@ async def get_proofs_pending(
     return [Proof(**r) for r in rows]
 
 
+async def get_proof_used(
+    db: Database,
+    proof: Proof,
+    conn: Optional[Connection] = None,
+) -> Optional[Proof]:
+    row = await (conn or db).fetchone(
+        f"""
+        SELECT 1 from {table_with_schema(db, 'proofs_used')}
+        WHERE secret = ?
+        """,
+        (str(proof.secret),),
+    )
+    return Proof(**row) if row else None
+
+
 async def set_proof_pending(
     db: Database,
     proof: Proof,
@@ -394,3 +434,14 @@ async def get_keyset(
         tuple(values),
     )
     return [MintKeyset(**row) for row in rows]
+
+
+async def get_balance(
+    db: Database,
+    conn: Optional[Connection] = None,
+) -> int:
+    row = await (conn or db).fetchone(f"""
+        SELECT * from {table_with_schema(db, 'balance')}
+        """)
+    assert row, "Balance not found"
+    return int(row[0])
diff --git a/cashu/mint/ledger.py b/cashu/mint/ledger.py
index 371da7dd..a0402481 100644
--- a/cashu/mint/ledger.py
+++ b/cashu/mint/ledger.py
@@ -1,6 +1,6 @@
 import asyncio
 import math
-from typing import Dict, List, Optional, Set, Tuple
+from typing import Dict, List, Optional, Tuple
 
 import bolt11
 from loguru import logger
@@ -49,7 +49,6 @@ def __init__(
         crud: LedgerCrud,
         derivation_path="",
     ):
-        self.secrets_used: Set[str] = set()
         self.master_key = seed
         self.derivation_path = derivation_path
 
@@ -146,6 +145,10 @@ def get_keyset(self, keyset_id: Optional[str] = None) -> Dict[int, str]:
         assert keyset.public_keys, KeysetError("no public keys for this keyset")
         return {a: p.serialize().hex() for a, p in keyset.public_keys.items()}
 
+    async def get_balance(self) -> int:
+        """Returns the balance of the mint."""
+        return await self.crud.get_balance(db=self.db)
+
     # ------- ECASH -------
 
     async def _invalidate_proofs(self, proofs: List[Proof]) -> None:
@@ -158,9 +161,10 @@ async def _invalidate_proofs(self, proofs: List[Proof]) -> None:
         # Mark proofs as used and prepare new promises
         secrets = set([p.secret for p in proofs])
         self.secrets_used |= secrets
-        # store in db
-        for p in proofs:
-            await self.crud.invalidate_proof(proof=p, db=self.db)
+        async with self.db.connect() as conn:
+            # store in db
+            for p in proofs:
+                await self.crud.invalidate_proof(proof=p, db=self.db, conn=conn)
 
     async def _generate_change_promises(
         self,
@@ -245,6 +249,10 @@ async def request_mint(self, amount: int) -> Tuple[str, str]:
             )
         if settings.mint_peg_out_only:
             raise NotAllowedError("Mint does not allow minting new tokens.")
+        if settings.mint_max_balance:
+            balance = await self.get_balance()
+            if balance + amount > settings.mint_max_balance:
+                raise NotAllowedError("Mint has reached maximum balance.")
 
         logger.trace(f"requesting invoice for {amount} satoshis")
         invoice_response = await self._request_lightning_invoice(amount)
@@ -530,70 +538,59 @@ async def restore(
     async def _generate_promises(
         self, B_s: List[BlindedMessage], keyset: Optional[MintKeyset] = None
     ) -> list[BlindedSignature]:
-        """Generates promises that sum to the given amount.
-
-        Args:
-            B_s (List[BlindedMessage]): _description_
-            keyset (Optional[MintKeyset], optional): _description_. Defaults to None.
-
-        Returns:
-            list[BlindedSignature]: _description_
-        """
-        return [
-            await self._generate_promise(
-                b.amount, PublicKey(bytes.fromhex(b.B_), raw=True), keyset
-            )
-            for b in B_s
-        ]
-
-    async def _generate_promise(
-        self, amount: int, B_: PublicKey, keyset: Optional[MintKeyset] = None
-    ) -> BlindedSignature:
-        """Generates a promise (Blind signature) for given amount and returns a pair (amount, C').
+        """Generates a promises (Blind signatures) for given amount and returns a pair (amount, C').
 
         Args:
-            amount (int): Amount of the promise.
-            B_ (PublicKey): Blinded secret (point on curve)
+            B_s (List[BlindedMessage]): Blinded secret (point on curve)
             keyset (Optional[MintKeyset], optional): Which keyset to use. Private keys will be taken from this keyset. Defaults to None.
 
         Returns:
-            BlindedSignature: Generated promise.
+            list[BlindedSignature]: Generated BlindedSignatures.
         """
         keyset = keyset if keyset else self.keyset
-        logger.trace(f"Generating promise with keyset {keyset.id}.")
-        private_key_amount = keyset.private_keys[amount]
-        C_, e, s = b_dhke.step2_bob(B_, private_key_amount)
-        logger.trace(f"crud: _generate_promise storing promise for {amount}")
-        await self.crud.store_promise(
-            amount=amount,
-            B_=B_.serialize().hex(),
-            C_=C_.serialize().hex(),
-            e=e.serialize(),
-            s=s.serialize(),
-            db=self.db,
-            id=keyset.id,
-        )
-        logger.trace(f"crud: _generate_promise stored promise for {amount}")
-        return BlindedSignature(
-            id=keyset.id,
-            amount=amount,
-            C_=C_.serialize().hex(),
-            dleq=DLEQ(e=e.serialize(), s=s.serialize()),
-        )
+        promises = []
+        for b in B_s:
+            amount = b.amount
+            B_ = PublicKey(bytes.fromhex(b.B_), raw=True)
+            logger.trace(f"Generating promise with keyset {keyset.id}.")
+            private_key_amount = keyset.private_keys[amount]
+            C_, e, s = b_dhke.step2_bob(B_, private_key_amount)
+            promises.append((B_, amount, C_, e, s))
+
+        signatures = []
+        async with self.db.connect() as conn:
+            for promise in promises:
+                B_, amount, C_, e, s = promise
+                logger.trace(f"crud: _generate_promise storing promise for {amount}")
+                await self.crud.store_promise(
+                    amount=amount,
+                    id=keyset.id,
+                    B_=B_.serialize().hex(),
+                    C_=C_.serialize().hex(),
+                    e=e.serialize(),
+                    s=s.serialize(),
+                    db=self.db,
+                    conn=conn,
+                )
+                logger.trace(f"crud: _generate_promise stored promise for {amount}")
+                signature = BlindedSignature(
+                    id=keyset.id,
+                    amount=amount,
+                    C_=C_.serialize().hex(),
+                    dleq=DLEQ(e=e.serialize(), s=s.serialize()),
+                )
+                signatures.append(signature)
+            return signatures
 
     # ------- PROOFS -------
 
     async def load_used_proofs(self) -> None:
         """Load all used proofs from database."""
-        logger.trace("crud: loading used proofs")
+        logger.debug("Loading used proofs into memory")
         secrets_used = await self.crud.get_secrets_used(db=self.db)
-        logger.trace(f"crud: loaded {len(secrets_used)} used proofs")
+        logger.debug(f"Loaded {len(secrets_used)} used proofs")
         self.secrets_used = set(secrets_used)
 
-    def _check_spendable(self, proof: Proof) -> bool:
-        """Checks whether the proof was already spent."""
-        return proof.secret not in self.secrets_used
-
     async def _check_pending(self, proofs: List[Proof]) -> List[bool]:
         """Checks whether the proof is still pending."""
         proofs_pending = await self.crud.get_proofs_pending(db=self.db)
@@ -620,13 +617,12 @@ async def check_proof_state(
             List[bool]: List of which proof is still spendable (True if still spendable, else False)
             List[bool]: List of which proof are pending (True if pending, else False)
         """
-        spendable = [self._check_spendable(p) for p in proofs]
+
+        spendable = await self._check_proofs_spendable(proofs)
         pending = await self._check_pending(proofs)
         return spendable, pending
 
-    async def _set_proofs_pending(
-        self, proofs: List[Proof], conn: Optional[Connection] = None
-    ) -> None:
+    async def _set_proofs_pending(self, proofs: List[Proof]) -> None:
         """If none of the proofs is in the pending table (_validate_proofs_pending), adds proofs to
         the list of pending proofs or removes them. Used as a mutex for proofs.
 
@@ -638,24 +634,26 @@ async def _set_proofs_pending(
         """
         # first we check whether these proofs are pending already
         async with self.proofs_pending_lock:
-            await self._validate_proofs_pending(proofs, conn)
-            for p in proofs:
-                try:
-                    await self.crud.set_proof_pending(proof=p, db=self.db, conn=conn)
-                except Exception:
-                    raise TransactionError("proofs already pending.")
-
-    async def _unset_proofs_pending(
-        self, proofs: List[Proof], conn: Optional[Connection] = None
-    ) -> None:
+            async with self.db.connect() as conn:
+                await self._validate_proofs_pending(proofs, conn)
+                for p in proofs:
+                    try:
+                        await self.crud.set_proof_pending(
+                            proof=p, db=self.db, conn=conn
+                        )
+                    except Exception:
+                        raise TransactionError("proofs already pending.")
+
+    async def _unset_proofs_pending(self, proofs: List[Proof]) -> None:
         """Deletes proofs from pending table.
 
         Args:
             proofs (List[Proof]): Proofs to delete.
         """
         async with self.proofs_pending_lock:
-            for p in proofs:
-                await self.crud.unset_proof_pending(proof=p, db=self.db, conn=conn)
+            async with self.db.connect() as conn:
+                for p in proofs:
+                    await self.crud.unset_proof_pending(proof=p, db=self.db, conn=conn)
 
     async def _validate_proofs_pending(
         self, proofs: List[Proof], conn: Optional[Connection] = None
diff --git a/cashu/mint/migrations.py b/cashu/mint/migrations.py
index 866e3ca2..67a3d0fe 100644
--- a/cashu/mint/migrations.py
+++ b/cashu/mint/migrations.py
@@ -204,3 +204,13 @@ async def m009_add_out_to_invoices(db: Database):
         await conn.execute(
             f"ALTER TABLE {table_with_schema(db, 'invoices')} ADD COLUMN out BOOL"
         )
+
+
+async def m010_add_index_to_proofs_used(db: Database):
+    # create index on proofs_used table for secret
+    async with db.connect() as conn:
+        await conn.execute(
+            "CREATE INDEX IF NOT EXISTS"
+            f" {table_with_schema(db, 'proofs_used')}_secret_idx ON"
+            f" {table_with_schema(db, 'proofs_used')} (secret)"
+        )
diff --git a/cashu/mint/startup.py b/cashu/mint/startup.py
index 162c853f..833cc883 100644
--- a/cashu/mint/startup.py
+++ b/cashu/mint/startup.py
@@ -47,7 +47,8 @@ async def rotate_keys(n_seconds=10):
 
 async def start_mint_init():
     await migrate_databases(ledger.db, migrations)
-    await ledger.load_used_proofs()
+    if settings.mint_cache_secrets:
+        await ledger.load_used_proofs()
     await ledger.init_keysets()
 
     if settings.lightning:
diff --git a/cashu/mint/verification.py b/cashu/mint/verification.py
index a50ba5ee..1cbd76b8 100644
--- a/cashu/mint/verification.py
+++ b/cashu/mint/verification.py
@@ -11,6 +11,7 @@
 )
 from ..core.crypto import b_dhke
 from ..core.crypto.secp import PublicKey
+from ..core.db import Database
 from ..core.errors import (
     NoSecretInProofsError,
     NotAllowedError,
@@ -19,16 +20,19 @@
     TransactionError,
 )
 from ..core.settings import settings
+from ..mint.crud import LedgerCrud
 from .conditions import LedgerSpendingConditions
-from .protocols import SupportsKeysets
+from .protocols import SupportsDb, SupportsKeysets
 
 
-class LedgerVerification(LedgerSpendingConditions, SupportsKeysets):
+class LedgerVerification(LedgerSpendingConditions, SupportsKeysets, SupportsDb):
     """Verification functions for the ledger."""
 
     keyset: MintKeyset
     keysets: MintKeysets
-    secrets_used: Set[str]
+    secrets_used: Set[str] = set()
+    crud: LedgerCrud
+    db: Database
 
     async def verify_inputs_and_outputs(
         self, proofs: List[Proof], outputs: Optional[List[BlindedMessage]] = None
@@ -48,7 +52,9 @@ async def verify_inputs_and_outputs(
         """
         # Verify inputs
         # Verify proofs are spendable
-        self._check_proofs_spendable(proofs)
+        spendable = await self._check_proofs_spendable(proofs)
+        if not all(spendable):
+            raise TokenAlreadySpentError()
         # Verify amounts of inputs
         if not all([self._verify_amount(p.amount) for p in proofs]):
             raise TransactionError("invalid amount.")
@@ -87,10 +93,24 @@ def _verify_outputs(self, outputs: List[BlindedMessage]):
         if not self._verify_no_duplicate_outputs(outputs):
             raise TransactionError("duplicate outputs.")
 
-    def _check_proofs_spendable(self, proofs: List[Proof]):
-        """Checks whether the proofs were already spent."""
-        if not all([p.secret not in self.secrets_used for p in proofs]):
-            raise TokenAlreadySpentError()
+    async def _check_proofs_spendable(self, proofs: List[Proof]) -> List[bool]:
+        """Checks whether the proof was already spent."""
+        spendable_states = []
+        if settings.mint_cache_secrets:
+            # check used secrets in memory
+            for p in proofs:
+                spendable_state = p.secret not in self.secrets_used
+                spendable_states.append(spendable_state)
+        else:
+            # check used secrets in database
+            async with self.db.connect() as conn:
+                for p in proofs:
+                    spendable_state = (
+                        await self.crud.get_proof_used(db=self.db, proof=p, conn=conn)
+                        is None
+                    )
+                    spendable_states.append(spendable_state)
+        return spendable_states
 
     def _verify_secret_criteria(self, proof: Proof) -> Literal[True]:
         """Verifies that a secret is present and is not too long (DOS prevention)."""
diff --git a/cashu/wallet/wallet.py b/cashu/wallet/wallet.py
index 7c20ff81..b3c8baf4 100644
--- a/cashu/wallet/wallet.py
+++ b/cashu/wallet/wallet.py
@@ -94,6 +94,7 @@ async def wrapper(self, *args, **kwargs):
             proxies=proxies_dict,  # type: ignore
             headers=headers_dict,
             base_url=self.url,
+            timeout=None if settings.debug else 5,
         )
         return await func(self, *args, **kwargs)
 
@@ -171,21 +172,24 @@ async def _load_mint_keys(self, keyset_id: Optional[str] = None) -> None:
         keyset_local: Union[WalletKeyset, None] = None
         if keyset_id:
             # check if current keyset is in db
+            logger.trace(f"Checking if keyset {keyset_id} is in database.")
             keyset_local = await get_keyset(keyset_id, db=self.db)
             if keyset_local:
-                logger.debug(f"Found keyset {keyset_id} in database.")
+                logger.trace(f"Found keyset {keyset_id} in database.")
             else:
-                logger.debug(
-                    f"Cannot find keyset {keyset_id} in database. Loading keyset from"
-                    " mint."
+                logger.trace(
+                    f"Could not find keyset {keyset_id} in database. Loading keyset"
+                    " from mint."
                 )
             keyset = keyset_local
 
         if keyset_local is None and keyset_id:
             # get requested keyset from mint
+            logger.trace(f"Getting keyset {keyset_id} from mint.")
             keyset = await self._get_keys_of_keyset(self.url, keyset_id)
         else:
             # get current keyset
+            logger.trace("Getting current keyset from mint.")
             keyset = await self._get_keys(self.url)
 
         assert keyset
diff --git a/poetry.lock b/poetry.lock
index 95e82158..40405c08 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,10 +1,9 @@
-# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "anyio"
 version = "4.0.0"
 description = "High level compatibility layer for multiple asynchronous event loop implementations"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -26,7 +25,6 @@ trio = ["trio (>=0.22)"]
 name = "asn1crypto"
 version = "1.5.1"
 description = "Fast ASN.1 parser and serializer with definitions for private keys, public keys, certificates, CRL, OCSP, CMS, PKCS#3, PKCS#7, PKCS#8, PKCS#12, PKCS#5, X.509 and TSP"
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -38,7 +36,6 @@ files = [
 name = "attrs"
 version = "23.1.0"
 description = "Classes Without Boilerplate"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -57,7 +54,6 @@ tests-no-zope = ["cloudpickle", "hypothesis", "mypy (>=1.1.1)", "pympler", "pyte
 name = "base58"
 version = "2.1.1"
 description = "Base58 and Base58Check implementation."
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -72,7 +68,6 @@ tests = ["PyHamcrest (>=2.0.2)", "mypy", "pytest (>=4.6)", "pytest-benchmark", "
 name = "bech32"
 version = "1.2.0"
 description = "Reference implementation for Bech32 and segwit addresses."
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -84,7 +79,6 @@ files = [
 name = "bip32"
 version = "3.4"
 description = "Minimalistic implementation of the BIP32 key derivation scheme"
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -100,7 +94,6 @@ coincurve = ">=15.0,<19"
 name = "bitstring"
 version = "3.1.9"
 description = "Simple construction, analysis and modification of binary data."
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -113,7 +106,6 @@ files = [
 name = "black"
 version = "23.9.1"
 description = "The uncompromising code formatter."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -160,7 +152,6 @@ uvloop = ["uvloop (>=0.15.2)"]
 name = "bolt11"
 version = "2.0.5"
 description = "A library for encoding and decoding BOLT11 payment requests."
-category = "main"
 optional = false
 python-versions = ">=3.8.1"
 files = [
@@ -180,7 +171,6 @@ secp256k1 = "*"
 name = "certifi"
 version = "2023.7.22"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -192,7 +182,6 @@ files = [
 name = "cffi"
 version = "1.16.0"
 description = "Foreign Function Interface for Python calling C code."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -257,7 +246,6 @@ pycparser = "*"
 name = "cfgv"
 version = "3.4.0"
 description = "Validate configuration and produce human readable error messages."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -269,7 +257,6 @@ files = [
 name = "click"
 version = "8.1.7"
 description = "Composable command line interface toolkit"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -284,7 +271,6 @@ colorama = {version = "*", markers = "platform_system == \"Windows\""}
 name = "coincurve"
 version = "18.0.0"
 description = "Cross-platform Python CFFI bindings for libsecp256k1"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -340,7 +326,6 @@ cffi = ">=1.3.0"
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@@ -352,7 +337,6 @@ files = [
 name = "coverage"
 version = "7.3.2"
 description = "Code coverage measurement for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -420,7 +404,6 @@ toml = ["tomli"]
 name = "cryptography"
 version = "41.0.4"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -466,7 +449,6 @@ test-randomorder = ["pytest-randomly"]
 name = "distlib"
 version = "0.3.7"
 description = "Distribution utilities"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -478,7 +460,6 @@ files = [
 name = "ecdsa"
 version = "0.18.0"
 description = "ECDSA cryptographic signature library (pure python)"
-category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@@ -497,7 +478,6 @@ gmpy2 = ["gmpy2"]
 name = "environs"
 version = "9.5.0"
 description = "simplified environment variable parsing"
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -519,7 +499,6 @@ tests = ["dj-database-url", "dj-email-url", "django-cache-url", "pytest"]
 name = "exceptiongroup"
 version = "1.1.3"
 description = "Backport of PEP 654 (exception groups)"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -534,7 +513,6 @@ test = ["pytest (>=6)"]
 name = "fastapi"
 version = "0.103.0"
 description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -550,11 +528,24 @@ typing-extensions = ">=4.5.0"
 [package.extras]
 all = ["email-validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "pydantic-extra-types (>=2.0.0)", "pydantic-settings (>=2.0.0)", "python-multipart (>=0.0.5)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
 
+[[package]]
+name = "fastapi-profiler"
+version = "1.2.0"
+description = "A FastAPI Middleware of pyinstrument to check your service performance."
+optional = false
+python-versions = "*"
+files = [
+    {file = "fastapi_profiler-1.2.0-py3-none-any.whl", hash = "sha256:71615f815c5ff4fe193c14b1ecf6bfc250502c6adfca64a219340df5eb0a7a9b"},
+]
+
+[package.dependencies]
+fastapi = "*"
+pyinstrument = ">=4.4.0"
+
 [[package]]
 name = "filelock"
 version = "3.12.4"
 description = "A platform independent file lock."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -571,7 +562,6 @@ typing = ["typing-extensions (>=4.7.1)"]
 name = "h11"
 version = "0.14.0"
 description = "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -583,7 +573,6 @@ files = [
 name = "httpcore"
 version = "0.18.0"
 description = "A minimal low-level HTTP client."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -595,17 +584,16 @@ files = [
 anyio = ">=3.0,<5.0"
 certifi = "*"
 h11 = ">=0.13,<0.15"
-sniffio = ">=1.0.0,<2.0.0"
+sniffio = "==1.*"
 
 [package.extras]
 http2 = ["h2 (>=3,<5)"]
-socks = ["socksio (>=1.0.0,<2.0.0)"]
+socks = ["socksio (==1.*)"]
 
 [[package]]
 name = "httpx"
 version = "0.25.1"
 description = "The next generation HTTP client."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -619,19 +607,18 @@ certifi = "*"
 httpcore = "*"
 idna = "*"
 sniffio = "*"
-socksio = {version = ">=1.0.0,<2.0.0", optional = true, markers = "extra == \"socks\""}
+socksio = {version = "==1.*", optional = true, markers = "extra == \"socks\""}
 
 [package.extras]
 brotli = ["brotli", "brotlicffi"]
-cli = ["click (>=8.0.0,<9.0.0)", "pygments (>=2.0.0,<3.0.0)", "rich (>=10,<14)"]
+cli = ["click (==8.*)", "pygments (==2.*)", "rich (>=10,<14)"]
 http2 = ["h2 (>=3,<5)"]
-socks = ["socksio (>=1.0.0,<2.0.0)"]
+socks = ["socksio (==1.*)"]
 
 [[package]]
 name = "identify"
 version = "2.5.30"
 description = "File identification library for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -646,7 +633,6 @@ license = ["ukkonen"]
 name = "idna"
 version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -658,7 +644,6 @@ files = [
 name = "importlib-metadata"
 version = "6.8.0"
 description = "Read metadata from Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -678,7 +663,6 @@ testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -690,7 +674,6 @@ files = [
 name = "loguru"
 version = "0.7.2"
 description = "Python logging made (stupidly) simple"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -709,7 +692,6 @@ dev = ["Sphinx (==7.2.5)", "colorama (==0.4.5)", "colorama (==0.4.6)", "exceptio
 name = "marshmallow"
 version = "3.20.1"
 description = "A lightweight library for converting complex datatypes to and from native Python datatypes."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -730,7 +712,6 @@ tests = ["pytest", "pytz", "simplejson"]
 name = "mnemonic"
 version = "0.20"
 description = "Implementation of Bitcoin BIP-0039"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -742,7 +723,6 @@ files = [
 name = "mypy"
 version = "1.6.0"
 description = "Optional static typing for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -789,7 +769,6 @@ reports = ["lxml"]
 name = "mypy-extensions"
 version = "1.0.0"
 description = "Type system extensions for programs checked with the mypy type checker."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -801,7 +780,6 @@ files = [
 name = "nodeenv"
 version = "1.8.0"
 description = "Node.js virtual environment builder"
-category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*"
 files = [
@@ -816,7 +794,6 @@ setuptools = "*"
 name = "outcome"
 version = "1.2.0"
 description = "Capture the outcome of Python function calls."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -831,7 +808,6 @@ attrs = ">=19.2.0"
 name = "packaging"
 version = "23.2"
 description = "Core utilities for Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -843,7 +819,6 @@ files = [
 name = "pathspec"
 version = "0.11.2"
 description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -855,7 +830,6 @@ files = [
 name = "platformdirs"
 version = "3.11.0"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -871,7 +845,6 @@ test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.4)", "pytest-co
 name = "pluggy"
 version = "1.3.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -887,7 +860,6 @@ testing = ["pytest", "pytest-benchmark"]
 name = "pre-commit"
 version = "3.5.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -906,7 +878,6 @@ virtualenv = ">=20.10.0"
 name = "psycopg2-binary"
 version = "2.9.9"
 description = "psycopg2 - Python-PostgreSQL Database Adapter"
-category = "main"
 optional = true
 python-versions = ">=3.7"
 files = [
@@ -985,7 +956,6 @@ files = [
 name = "pycparser"
 version = "2.21"
 description = "C parser in Python"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -997,7 +967,6 @@ files = [
 name = "pycryptodomex"
 version = "3.19.0"
 description = "Cryptographic library for Python"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
@@ -1039,7 +1008,6 @@ files = [
 name = "pydantic"
 version = "1.10.13"
 description = "Data validation and settings management using python type hints"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1088,11 +1056,86 @@ typing-extensions = ">=4.2.0"
 dotenv = ["python-dotenv (>=0.10.4)"]
 email = ["email-validator (>=1.0.3)"]
 
+[[package]]
+name = "pyinstrument"
+version = "4.6.1"
+description = "Call stack profiler for Python. Shows you why your code is slow!"
+optional = false
+python-versions = ">=3.7"
+files = [
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+    {file = "pyinstrument-4.6.1.tar.gz", hash = "sha256:f4731b27121350f5a983d358d2272fe3df2f538aed058f57217eef7801a89288"},
+]
+
+[package.extras]
+bin = ["click", "nox"]
+docs = ["furo (==2021.6.18b36)", "myst-parser (==0.15.1)", "sphinx (==4.2.0)", "sphinxcontrib-programoutput (==0.17)"]
+examples = ["django", "numpy"]
+test = ["flaky", "greenlet (>=3.0.0a1)", "ipython", "pytest", "pytest-asyncio (==0.12.0)", "sphinx-autobuild (==2021.3.14)", "trio"]
+types = ["typing-extensions"]
+
 [[package]]
 name = "pytest"
 version = "7.4.2"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1115,7 +1158,6 @@ testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "no
 name = "pytest-asyncio"
 version = "0.21.1"
 description = "Pytest support for asyncio"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1134,7 +1176,6 @@ testing = ["coverage (>=6.2)", "flaky (>=3.5.0)", "hypothesis (>=5.7.1)", "mypy
 name = "pytest-cov"
 version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1153,7 +1194,6 @@ testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtuale
 name = "python-dotenv"
 version = "1.0.0"
 description = "Read key-value pairs from a .env file and set them as environment variables"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1168,7 +1208,6 @@ cli = ["click (>=5.0)"]
 name = "pyyaml"
 version = "6.0.1"
 description = "YAML parser and emitter for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -1218,7 +1257,6 @@ files = [
 name = "represent"
 version = "1.6.0.post0"
 description = "Create __repr__ automatically or declaratively."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -1236,7 +1274,6 @@ test = ["ipython", "mock", "pytest (>=3.0.5)"]
 name = "ruff"
 version = "0.0.284"
 description = "An extremely fast Python linter, written in Rust."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1263,7 +1300,6 @@ files = [
 name = "secp256k1"
 version = "0.14.0"
 description = "FFI bindings to libsecp256k1"
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -1299,7 +1335,6 @@ cffi = ">=1.3.0"
 name = "setuptools"
 version = "68.2.2"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1316,7 +1351,6 @@ testing-integration = ["build[virtualenv] (>=1.0.3)", "filelock (>=3.4.0)", "jar
 name = "six"
 version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@@ -1328,7 +1362,6 @@ files = [
 name = "sniffio"
 version = "1.3.0"
 description = "Sniff out which async library your code is running under"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1340,7 +1373,6 @@ files = [
 name = "socksio"
 version = "1.0.0"
 description = "Sans-I/O implementation of SOCKS4, SOCKS4A, and SOCKS5."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -1352,7 +1384,6 @@ files = [
 name = "sqlalchemy"
 version = "1.3.24"
 description = "Database Abstraction Library"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -1408,7 +1439,6 @@ pymysql = ["pymysql", "pymysql (<1)"]
 name = "sqlalchemy-aio"
 version = "0.17.0"
 description = "Async support for SQLAlchemy."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -1430,7 +1460,6 @@ trio = ["trio (>=0.15)"]
 name = "starlette"
 version = "0.27.0"
 description = "The little ASGI library that shines."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1449,7 +1478,6 @@ full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart", "pyyam
 name = "tomli"
 version = "2.0.1"
 description = "A lil' TOML parser"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1461,7 +1489,6 @@ files = [
 name = "typing-extensions"
 version = "4.8.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1473,7 +1500,6 @@ files = [
 name = "uvicorn"
 version = "0.23.2"
 description = "The lightning-fast ASGI server."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1493,7 +1519,6 @@ standard = ["colorama (>=0.4)", "httptools (>=0.5.0)", "python-dotenv (>=0.13)",
 name = "virtualenv"
 version = "20.24.5"
 description = "Virtual Python Environment builder"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1514,7 +1539,6 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 name = "websocket-client"
 version = "1.6.4"
 description = "WebSocket client for Python with low level API options"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1531,7 +1555,6 @@ test = ["websockets"]
 name = "wheel"
 version = "0.41.2"
 description = "A built-package format for Python"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1546,7 +1569,6 @@ test = ["pytest (>=6.0.0)", "setuptools (>=65)"]
 name = "win32-setctime"
 version = "1.1.0"
 description = "A small Python utility to set file creation time on Windows"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1561,7 +1583,6 @@ dev = ["black (>=19.3b0)", "pytest (>=4.6.2)"]
 name = "zipp"
 version = "3.17.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1579,4 +1600,4 @@ pgsql = ["psycopg2-binary"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8.1"
-content-hash = "fd3495f7158b86ad25037517a1dfe033cfd367d75857b4db5c9db10f233bb842"
+content-hash = "b2c312fd906aa18a26712039f700322c2c20889a95e1cd9af787df54d700b2ca"
diff --git a/pyproject.toml b/pyproject.toml
index 608bbc9b..98b725a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,7 @@ pytest-cov = "^4.0.0"
 pytest = "^7.4.0"
 ruff = "^0.0.284"
 pre-commit = "^3.3.3"
+fastapi-profiler = "^1.2.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
diff --git a/tests/conftest.py b/tests/conftest.py
index 9906b832..90562137 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -20,6 +20,7 @@
 SERVER_PORT = 3337
 SERVER_ENDPOINT = f"http://localhost:{SERVER_PORT}"
 
+settings.debug = True
 settings.cashu_dir = "./test_data/"
 settings.mint_host = "localhost"
 settings.mint_port = SERVER_PORT
@@ -32,6 +33,7 @@
 settings.mint_database = "./test_data/test_mint"
 settings.mint_derivation_path = "0/0/0/0"
 settings.mint_private_key = "TEST_PRIVATE_KEY"
+settings.mint_max_balance = 0
 
 shutil.rmtree(settings.cashu_dir, ignore_errors=True)
 Path(settings.cashu_dir).mkdir(parents=True, exist_ok=True)
@@ -54,7 +56,8 @@ def run(self, *args, **kwargs):
 async def ledger():
     async def start_mint_init(ledger: Ledger):
         await migrate_databases(ledger.db, migrations_mint)
-        await ledger.load_used_proofs()
+        if settings.mint_cache_secrets:
+            await ledger.load_used_proofs()
         await ledger.init_keysets()
 
     database_name = "test"
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 3ec460e3..64119ae4 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,4 +1,5 @@
 import asyncio
+from typing import Tuple
 
 import pytest
 from click.testing import CliRunner
@@ -15,7 +16,7 @@ def cli_prefix():
     yield ["--wallet", "test_cli_wallet", "--host", settings.mint_url, "--tests"]
 
 
-def get_bolt11_and_invoice_id_from_invoice_command(output: str) -> (str, str):
+def get_bolt11_and_invoice_id_from_invoice_command(output: str) -> Tuple[str, str]:
     invoice = [
         line.split(" ")[1] for line in output.split("\n") if line.startswith("Invoice")
     ][0]
diff --git a/tests/test_mint.py b/tests/test_mint.py
index 404f42ab..c646bbba 100644
--- a/tests/test_mint.py
+++ b/tests/test_mint.py
@@ -182,3 +182,20 @@ async def test_generate_change_promises_returns_empty_if_no_outputs(ledger: Ledg
         total_provided, invoice_amount, actual_fee_msat, outputs
     )
     assert len(promises) == 0
+
+
+@pytest.mark.asyncio
+async def test_get_balance(ledger: Ledger):
+    balance = await ledger.get_balance()
+    assert balance == 0
+
+
+@pytest.mark.asyncio
+async def test_maximum_balance(ledger: Ledger):
+    settings.mint_max_balance = 1000
+    invoice, id = await ledger.request_mint(8)
+    await assert_err(
+        ledger.request_mint(8000),
+        "Mint has reached maximum balance.",
+    )
+    settings.mint_max_balance = 0
diff --git a/tests/test_wallet.py b/tests/test_wallet.py
index 6433009c..d719ce94 100644
--- a/tests/test_wallet.py
+++ b/tests/test_wallet.py
@@ -1,3 +1,4 @@
+import copy
 import shutil
 from pathlib import Path
 from typing import List, Union
@@ -9,7 +10,7 @@
 from cashu.core.errors import CashuError, KeysetNotFoundError
 from cashu.core.helpers import sum_proofs
 from cashu.core.settings import settings
-from cashu.wallet.crud import get_lightning_invoice, get_proofs
+from cashu.wallet.crud import get_keyset, get_lightning_invoice, get_proofs
 from cashu.wallet.wallet import Wallet
 from cashu.wallet.wallet import Wallet as Wallet1
 from cashu.wallet.wallet import Wallet as Wallet2
@@ -114,6 +115,27 @@ async def test_get_keyset(wallet1: Wallet):
     assert len(keys1.public_keys) == len(keys2.public_keys)
 
 
+@pytest.mark.asyncio
+async def test_get_keyset_from_db(wallet1: Wallet):
+    # first load it from the mint
+    # await wallet1._load_mint_keys()
+    # NOTE: conftest already called wallet.load_mint() which got the keys from the mint
+    keyset1 = copy.copy(wallet1.keysets[wallet1.keyset_id])
+
+    # then load it from the db
+    await wallet1._load_mint_keys()
+    keyset2 = copy.copy(wallet1.keysets[wallet1.keyset_id])
+
+    assert keyset1.public_keys == keyset2.public_keys
+    assert keyset1.id == keyset2.id
+
+    # load it directly from the db
+    keyset3 = await get_keyset(db=wallet1.db, id=keyset1.id)
+    assert keyset3
+    assert keyset1.public_keys == keyset3.public_keys
+    assert keyset1.id == keyset3.id
+
+
 @pytest.mark.asyncio
 async def test_get_info(wallet1: Wallet):
     info = await wallet1._get_info(wallet1.url)