diff --git a/examples/deriveApiKey.ts b/examples/deriveApiKey.ts
new file mode 100644
index 0000000..135fba7
--- /dev/null
+++ b/examples/deriveApiKey.ts
@@ -0,0 +1,23 @@
+import { ethers } from "ethers";
+import { config as dotenvConfig } from "dotenv";
+import { resolve } from "path";
+import { ClobClient } from "../src";
+
+dotenvConfig({ path: resolve(__dirname, "../.env") });
+
+async function main() {
+    const provider = new ethers.providers.JsonRpcProvider(process.env.RPC_URL);
+    const pk = new ethers.Wallet(`${process.env.PK}`);
+    const wallet = pk.connect(provider);
+    console.log(`Address: ${await wallet.getAddress()}`);
+
+    const host = "http://localhost:8080";
+    const clobClient = new ClobClient(host, wallet);
+
+    console.log(`Response: `);
+    const resp = await clobClient.deriveApiKey();
+    console.log(resp);
+    console.log(`Complete!`);
+}
+
+main();
diff --git a/package.json b/package.json
index 1454c4c..0d6701b 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@polymarket/clob-client",
     "description": "Typescript client for Polymarket's CLOB",
-    "version": "1.0.21",
+    "version": "1.0.22",
     "contributors": [
         {
             "name": "Jonathan Amenechi",
diff --git a/src/client.ts b/src/client.ts
index 9dd80b9..90e1ea4 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -16,7 +16,6 @@ import {
     OrderHistory,
 } from "./types";
 import { createL1Headers, createL2Headers } from "./headers";
-import { CREDS_CREATION_WARNING } from "./constants";
 import { del, DELETE, GET, get, POST, post } from "./http_helpers";
 import { L1_AUTH_UNAVAILABLE_ERROR, L2_AUTH_NOT_AVAILABLE } from "./errors";
 import { marketOrderToJson, limitOrderToJson, addQueryParamsToUrl } from "./utilities";
@@ -35,6 +34,7 @@ import {
     PRICE,
     OPEN_ORDERS,
     ORDER_HISTORY,
+    DERIVE_API_KEY,
 } from "./endpoints";
 import { OrderBuilder } from "./order-builder/builder";
 
@@ -92,13 +92,32 @@ export class ClobClient {
     }
 
     // L1 Authed
-    public async createApiKey(): Promise<ApiKeyCreds> {
+
+    /**
+     * Creates a new API key for a user
+     * @param nonce
+     * @returns ApiKeyCreds
+     */
+    public async createApiKey(nonce?: number): Promise<ApiKeyCreds> {
         this.canL1Auth();
 
         const endpoint = `${this.host}${CREATE_API_KEY}`;
-        const headers = await createL1Headers(this.signer as Wallet | JsonRpcSigner);
+        const headers = await createL1Headers(this.signer as Wallet | JsonRpcSigner, nonce);
         const resp = await post(endpoint, headers);
-        console.log(CREDS_CREATION_WARNING);
+        return resp;
+    }
+
+    /**
+     * Derives an existing API key for a user
+     * @param nonce
+     * @returns ApiKeyCreds
+     */
+    public async deriveApiKey(nonce?: number): Promise<ApiKeyCreds> {
+        this.canL1Auth();
+
+        const endpoint = `${this.host}${DERIVE_API_KEY}`;
+        const headers = await createL1Headers(this.signer as Wallet | JsonRpcSigner, nonce);
+        const resp = await get(endpoint, headers);
         return resp;
     }
 
diff --git a/src/endpoints.ts b/src/endpoints.ts
index 9816cd5..ecf9a43 100644
--- a/src/endpoints.ts
+++ b/src/endpoints.ts
@@ -12,6 +12,8 @@ export const GET_API_KEYS = "/get-api-keys";
 
 export const DELETE_API_KEY = "/delete-api-key";
 
+export const DERIVE_API_KEY = "/derive-api-key";
+
 export const TRADE_HISTORY = "/trade-history";
 
 export const ORDER_HISTORY = "/order-history";
diff --git a/src/headers/index.ts b/src/headers/index.ts
index e0a207a..eb21e7d 100644
--- a/src/headers/index.ts
+++ b/src/headers/index.ts
@@ -3,15 +3,21 @@ import { Wallet } from "@ethersproject/wallet";
 import { buildClobEip712Signature, buildPolyHmacSignature } from "../signing";
 import { ApiKeyCreds, L1PolyHeader, L2HeaderArgs, L2PolyHeader } from "../types";
 
-export const createL1Headers = async (signer: Wallet | JsonRpcSigner): Promise<L1PolyHeader> => {
+export const createL1Headers = async (signer: Wallet | JsonRpcSigner, nonce?: number): Promise<L1PolyHeader> => {
     const now = Math.floor(Date.now() / 1000);
-    const sig = await buildClobEip712Signature(signer, now);
+    let n = 0; // Default nonce is 0
+    if (nonce !== undefined) {
+        n = nonce;
+    }
+
+    const sig = await buildClobEip712Signature(signer, now, n);
     const address = await signer.getAddress();
 
     const headers = {
         POLY_ADDRESS: address,
         POLY_SIGNATURE: sig,
         POLY_TIMESTAMP: `${now}`,
+        POLY_NONCE: `${n}`,
     };
     return headers;
 };
diff --git a/src/signing/eip712.ts b/src/signing/eip712.ts
index a901672..e7a43b1 100644
--- a/src/signing/eip712.ts
+++ b/src/signing/eip712.ts
@@ -9,7 +9,11 @@ import { MSG_TO_SIGN } from "./constants";
  * @param ts
  * @returns string
  */
-export const buildClobEip712Signature = async (signer: Wallet | JsonRpcSigner, timestamp: number): Promise<string> => {
+export const buildClobEip712Signature = async (
+    signer: Wallet | JsonRpcSigner,
+    timestamp: number,
+    nonce: number,
+): Promise<string> => {
     const address = await signer.getAddress();
     const chainID = await signer.getChainId();
     const ts = `${timestamp}`;
@@ -24,12 +28,14 @@ export const buildClobEip712Signature = async (signer: Wallet | JsonRpcSigner, t
         ClobAuth: [
             { name: "address", type: "address" },
             { name: "timestamp", type: "string" },
+            { name: "nonce", type: "uint256" },
             { name: "message", type: "string" },
         ],
     };
     const value = {
         address,
         timestamp: ts,
+        nonce,
         message: MSG_TO_SIGN,
     };
     // eslint-disable-next-line no-underscore-dangle
diff --git a/src/types.ts b/src/types.ts
index ca680d6..8c3430b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -17,6 +17,7 @@ export interface L1PolyHeader {
     POLY_ADDRESS: string;
     POLY_SIGNATURE: string;
     POLY_TIMESTAMP: string;
+    POLY_NONCE: string;
 }
 
 // API key verification