diff --git a/packages/onchain/package.json b/packages/onchain/package.json
index b146bd6..e6e1d2a 100644
--- a/packages/onchain/package.json
+++ b/packages/onchain/package.json
@@ -26,6 +26,9 @@
     "clean": "rimraf ./dist",
     "typecheck": "tsc --noEmit"
   },
+  "devDependencies": {
+    "@coinbase-platform/utils": "workspace:*"
+  },
   "peerDependencies": {
     "typescript": ">=5.0.4"
   },
diff --git a/packages/onchain/src/address/list-address-transactions.test.ts b/packages/onchain/src/address/list-address-transactions.test.ts
index ef7d4fb..70ee26b 100644
--- a/packages/onchain/src/address/list-address-transactions.test.ts
+++ b/packages/onchain/src/address/list-address-transactions.test.ts
@@ -1,5 +1,5 @@
 import { describe, test } from "vitest";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { createRpcClient } from "../rpc";
 import { listAddressTransactions } from "./list-address-transactions";
 
diff --git a/packages/onchain/src/balance/list-balance-details.test.ts b/packages/onchain/src/balance/list-balance-details.test.ts
index 987d398..4830330 100644
--- a/packages/onchain/src/balance/list-balance-details.test.ts
+++ b/packages/onchain/src/balance/list-balance-details.test.ts
@@ -1,5 +1,5 @@
 import { describe, test } from "vitest";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { createRpcClient } from "../rpc";
 import { listBalanceDetails } from "./list-balance-details";
 
diff --git a/packages/onchain/src/balance/list-balance-histories.test.ts b/packages/onchain/src/balance/list-balance-histories.test.ts
index c044f93..427b5f9 100644
--- a/packages/onchain/src/balance/list-balance-histories.test.ts
+++ b/packages/onchain/src/balance/list-balance-histories.test.ts
@@ -1,5 +1,5 @@
 import { describe, test } from "vitest";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { createRpcClient } from "../rpc";
 import { listBalanceHistories } from "./list-balance-histories";
 
diff --git a/packages/onchain/src/balance/list-balances.test.ts b/packages/onchain/src/balance/list-balances.test.ts
index 63f2b46..615c68c 100644
--- a/packages/onchain/src/balance/list-balances.test.ts
+++ b/packages/onchain/src/balance/list-balances.test.ts
@@ -1,5 +1,5 @@
 import { describe, test } from "vitest";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { createRpcClient } from "../rpc";
 import { listBalances } from "./list-balances";
 
diff --git a/packages/onchain/src/mocks/address.ts b/packages/onchain/src/mocks/address.ts
index 62e6504..19f57ca 100644
--- a/packages/onchain/src/mocks/address.ts
+++ b/packages/onchain/src/mocks/address.ts
@@ -1,6 +1,6 @@
 import { http, HttpResponse } from "msw";
 import type { DefaultBodyType, PathParams } from "msw";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { withRpcMethod } from "./predicates";
 
 export const handlers = [
diff --git a/packages/onchain/src/mocks/balance.ts b/packages/onchain/src/mocks/balance.ts
index d9c3bbe..9121e63 100644
--- a/packages/onchain/src/mocks/balance.ts
+++ b/packages/onchain/src/mocks/balance.ts
@@ -1,6 +1,6 @@
 import { http, HttpResponse } from "msw";
 import type { DefaultBodyType, PathParams } from "msw";
-import { RPC_URL } from "../constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { withRpcMethod } from "./predicates";
 
 export const handlers = [
diff --git a/packages/onchain/src/rpc.test.ts b/packages/onchain/src/rpc.test.ts
index 08b50ea..a592a9c 100644
--- a/packages/onchain/src/rpc.test.ts
+++ b/packages/onchain/src/rpc.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "vitest";
-import { RPC_URL } from "./constants";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
 import { createRpcClient } from "./rpc";
 
 describe("rpc", () => {
diff --git a/packages/onchain/src/rpc.ts b/packages/onchain/src/rpc.ts
index 51aabbb..2ff475a 100644
--- a/packages/onchain/src/rpc.ts
+++ b/packages/onchain/src/rpc.ts
@@ -1,5 +1,5 @@
-import { RPC_URL } from "./constants";
-import * as http from "./http";
+import { RPC_URL } from "@coinbase-platform/utils/constants";
+import * as http from "@coinbase-platform/utils/http";
 
 export type RpcClient = {
   __url: string;
diff --git a/packages/onchain/src/constants.ts b/packages/utils/constants.ts
similarity index 100%
rename from packages/onchain/src/constants.ts
rename to packages/utils/constants.ts
diff --git a/packages/onchain/src/http.ts b/packages/utils/http.ts
similarity index 100%
rename from packages/onchain/src/http.ts
rename to packages/utils/http.ts
diff --git a/packages/utils/package.json b/packages/utils/package.json
new file mode 100644
index 0000000..3360d7f
--- /dev/null
+++ b/packages/utils/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "@coinbase-platform/utils",
+  "version": "0.0.0",
+  "description": "Coinbase Platform Utils package",
+  "author": "roushou <roushou9@gmail.com>",
+  "license": "MIT",
+  "private": true,
+  "homepage": "https://github.com/roushou/coinbase-platform#readme",
+  "type": "module",
+  "files": ["src"],
+  "scripts": {
+    "typecheck": "tsc --noEmit"
+  },
+  "peerDependencies": {
+    "typescript": ">=5.0.4"
+  },
+  "peerDependenciesMeta": {
+    "typescript": {
+      "optional": true
+    }
+  },
+  "engine": {
+    "node": "^18.0.0 || >=20.0.0"
+  }
+}
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
new file mode 100644
index 0000000..53858a2
--- /dev/null
+++ b/packages/utils/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext", "DOM"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "allowJs": false,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d791f17..6fa57c4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -41,6 +41,16 @@ importers:
       typescript:
         specifier: '>=5.0.4'
         version: 5.4.5
+    devDependencies:
+      '@coinbase-platform/utils':
+        specifier: workspace:*
+        version: link:../utils
+
+  packages/utils:
+    dependencies:
+      typescript:
+        specifier: '>=5.0.4'
+        version: 5.4.5
 
 packages: