diff --git a/kairos-server/src/routes/mod.rs b/kairos-server/src/routes/mod.rs
index cc2b615e..9d4eb45c 100644
--- a/kairos-server/src/routes/mod.rs
+++ b/kairos-server/src/routes/mod.rs
@@ -13,6 +13,7 @@ use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
 pub struct PayloadBody {
+    #[serde(deserialize_with = "hex_to_vec", serialize_with = "vec_to_hex")]
     pub public_key: PublicKey,
     #[serde(deserialize_with = "hex_to_vec", serialize_with = "vec_to_hex")]
     pub payload: Vec<u8>,
diff --git a/nixos/tests/end-to-end.nix b/nixos/tests/end-to-end.nix
index fb81c59b..ae5173fe 100644
--- a/nixos/tests/end-to-end.nix
+++ b/nixos/tests/end-to-end.nix
@@ -22,6 +22,8 @@ nixosTest {
       };
       services.cctl.enable = true;
       environment.systemPackages = [ casper-client-rs ];
+      # allow HTTP for nixos-test environment
+      services.nginx.virtualHosts.${config.networking.hostName}.forceSSL = lib.mkForce false;
     };
 
     client = { config, pkgs, nodes, ... }: {
@@ -44,15 +46,34 @@ nixosTest {
 
     kairos.succeed("casper-client get-node-status --node-address http://localhost:11101")
 
-    deposit_request = { "public_key": "publickey", "amount": 10 }
+    # Tx Payload
+    #   nonce = 1
+    #   deposit:
+    #     amount = 1000
+    #
+    deposit_payload = "3009020101a004020203e8"
+    deposit_request = { "public_key": "deadbeef", "payload": deposit_payload, "signature": "cafebabe" }
     # REST API
-    client.succeed("curl -X POST http://kairos/api/v1/deposit -H 'Content-Type: application/json' -d '{}'".format(json.dumps(deposit_request)))
-
-    transfer_request = { "from": "publickey", "signature": "signature", "to": "publickey", "amount": 10 }
-    client.succeed("curl -X POST http://kairos/api/v1/transfer -H 'Content-Type: application/json' -d '{}'".format(json.dumps(transfer_request)))
-
-    withdraw_request = { "public_key": "publickey", "signature": "signature", "amount": 10 }
-    client.succeed("curl -X POST http://kairos/api/v1/withdraw -H 'Content-Type: application/json' -d '{}'".format(json.dumps(withdraw_request)))
+    client.succeed("curl --fail-with-body -X POST http://kairos/api/v1/deposit -H 'Content-Type: application/json' -d '{}'".format(json.dumps(deposit_request)))
+
+    # Tx Payload
+    #   nonce = 2
+    #   transfer:
+    #     recipient = DEADBEEF
+    #     amount = 1000
+    #
+    transfer_payload = "300f020102a10a0404deadbeef020203e8"
+    transfer_request = { "public_key": "deadbeef", "payload": transfer_payload, "signature": "cafebabe" }
+    client.succeed("curl --fail-with-body -X POST http://kairos/api/v1/transfer -H 'Content-Type: application/json' -d '{}'".format(json.dumps(transfer_request)))
+
+    # Tx Payload
+    #   nonce = 3
+    #   withdrawal:
+    #     amount = 1000
+    #
+    withdraw_payload = "3009020103a204020203e8"
+    withdraw_request = { "public_key": "deadbeef", "payload": withdraw_payload, "signature": "cafebabe" }
+    client.succeed("curl --fail-with-body -X POST http://kairos/api/v1/withdraw -H 'Content-Type: application/json' -d '{}'".format(json.dumps(withdraw_request)))
 
     # CLI with ed25519
     cli_output = client.succeed("kairos-cli deposit --amount 1000 --private-key ${testResources}/ed25519/secret_key.pem")