feat: Add Monad Testnet support for CCTP transfers (#71)

- Added MONAD_TESTNET (chain ID 10143) 
- Configured Monad Testnet CCTP contract addresses:
  - USDC: 0x534b2f3A21130d7a60830c2Df862319e593943A3
  - Token Messenger V2: 0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA
  - Message Transmitter V2: 0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275
- Set destination domain to 15
- Added Monad Testnet chain definition with RPC and block explorer
- Updated viem to v2.39.3 for arcTestnet support

---------

Co-authored-by: Chen Hui Jing <huijing.chen@circle.com>
Co-authored-by: Ali Kafel <ali.kafel@circle.com>

Author: 3 people

.github/workflows/ci.yml

@@ -6,15 +6,7 @@ on:
 jobs:
   lint-and-test:
     runs-on: ubuntu-latest
-    permissions:
-      id-token: write
     steps:
-      - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
-        with:
-          egress-policy: block
-          policy: global-allowed-endpoints-policy
-
       - name: Check out repository code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:

package-lock.json

@@ -31,7 +31,7 @@
     "react-timer-hook": "^4.0.5",
     "tailwind-merge": "^3.3.1",
     "tailwindcss-animate": "^1.0.7",
-    "viem": "^2.38.4"
+    "viem": "^2.39.3"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.13",

package.json

@@ -50,7 +50,8 @@ import {
   xdcTestnet,
   hyperliquidEvmTestnet,
   inkSepolia,
-  plumeSepolia
+  plumeSepolia,
+  arcTestnet
 } from "viem/chains";
 import { defineChain } from "viem";
 
@@ -84,29 +85,6 @@ import { getBytes } from "ethers";
 import { SystemProgram } from "@solana/web3.js";
 import { TOKEN_PROGRAM_ID } from "@solana/spl-token";
 
-// Custom Arc Testnet configuration
-const arcTestnet = defineChain({
-  id: 5042002,
-  name: "Arc Testnet",
-  nativeCurrency: {
-    decimals: 18,
-    name: "USDC",
-    symbol: "USDC",
-  },
-  rpcUrls: {
-    default: {
-      http: ["https://rpc.testnet.arc.network"],
-    },
-  },
-  blockExplorers: {
-    default: {
-      name: "Arc Testnet Explorer",
-      url: "https://testnet.arcscan.app/",
-    },
-  },
-  testnet: true,
-});
-
 // Custom Sonic Testnet configuration
 const sonicTestnet = defineChain({
   id: 14601,
@@ -153,6 +131,29 @@ const codexTestnet = defineChain({
   testnet: true,
 });
 
+// Monad Testnet configuration
+const monadTestnet = defineChain({
+  id: 10143,
+  name: "Monad Testnet",
+  nativeCurrency: {
+    decimals: 18,
+    name: "MON",
+    symbol: "MON",
+  },
+  rpcUrls: {
+    default: {
+      http: ["https://testnet-rpc.monad.xyz"],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: "Monad Explorer",
+      url: "https://testnet.monadexplorer.com",
+    },
+  },
+  testnet: true,
+});
+
 export type TransferStep =
   | "idle"
   | "approving"
@@ -180,6 +181,7 @@ const chains = {
   [SupportedChainId.XDC_TESTNET]: xdcTestnet,
   [SupportedChainId.HYPEREVM_TESTNET]: hyperliquidEvmTestnet,
   [SupportedChainId.INK_SEPOLIA]: inkSepolia,
+  [SupportedChainId.MONAD_TESTNET]: monadTestnet,
 };
 
 export function useCrossChainTransfer() {

src/hooks/use-cross-chain-transfer.ts

@@ -37,6 +37,7 @@ export enum SupportedChainId {
   PLUME_SEPOLIA = 98867,
   HYPEREVM_TESTNET = 998,
   INK_SEPOLIA = 763373,
+  MONAD_TESTNET = 10143,
 }
 
 export const DEFAULT_MAX_FEE = 1000n;
@@ -61,6 +62,7 @@ export const CHAIN_TO_CHAIN_NAME: Record<number, string> = {
   [SupportedChainId.PLUME_SEPOLIA]: "Plume Sepolia",
   [SupportedChainId.HYPEREVM_TESTNET]: "HyperEvm Testnet",
   [SupportedChainId.INK_SEPOLIA]: "Ink Sepolia",
+  [SupportedChainId.MONAD_TESTNET]: "Monad Testnet",
 };
 
 export const CHAIN_IDS_TO_USDC_ADDRESSES: Record<number, Hex | string> = {
@@ -82,6 +84,7 @@ export const CHAIN_IDS_TO_USDC_ADDRESSES: Record<number, Hex | string> = {
   [SupportedChainId.PLUME_SEPOLIA]: "0xcB5f30e335672893c7eb944B374c196392C19D18",
   [SupportedChainId.HYPEREVM_TESTNET]: "0x2B3370eE501B4a559b57D449569354196457D8Ab",
   [SupportedChainId.INK_SEPOLIA]: "0xFabab97dCE620294D2B0b0e46C68964e326300Ac",
+  [SupportedChainId.MONAD_TESTNET]: "0x534b2f3a21130d7a60830c2df862319e593943a3",
 };
 
 export const CHAIN_IDS_TO_TOKEN_MESSENGER: Record<number, Hex | string> = {
@@ -103,6 +106,7 @@ export const CHAIN_IDS_TO_TOKEN_MESSENGER: Record<number, Hex | string> = {
   [SupportedChainId.PLUME_SEPOLIA]: "0x8fe6b999dc680ccfdd5bf7eb0974218be2542daa",
   [SupportedChainId.HYPEREVM_TESTNET]: "0x8fe6b999dc680ccfdd5bf7eb0974218be2542daa",
   [SupportedChainId.INK_SEPOLIA]: "0x8fe6b999dc680ccfdd5bf7eb0974218be2542daa",
+  [SupportedChainId.MONAD_TESTNET]: "0x8fe6b999dc680ccfdd5bf7eb0974218be2542daa",
 };
 
 export const CHAIN_IDS_TO_MESSAGE_TRANSMITTER: Record<number, Hex | string> = {
@@ -124,6 +128,7 @@ export const CHAIN_IDS_TO_MESSAGE_TRANSMITTER: Record<number, Hex | string> = {
   [SupportedChainId.PLUME_SEPOLIA]: "0xe737e5cebeeba77efe34d4aa090756590b1ce275",
   [SupportedChainId.HYPEREVM_TESTNET]: "0xe737e5cebeeba77efe34d4aa090756590b1ce275",
   [SupportedChainId.INK_SEPOLIA]: "0xe737e5cebeeba77efe34d4aa090756590b1ce275",
+  [SupportedChainId.MONAD_TESTNET]: "0xe737e5cebeeba77efe34d4aa090756590b1ce275",
 };
 
 export const DESTINATION_DOMAINS: Record<number, number> = {
@@ -145,6 +150,7 @@ export const DESTINATION_DOMAINS: Record<number, number> = {
   [SupportedChainId.PLUME_SEPOLIA]: 22,
   [SupportedChainId.HYPEREVM_TESTNET]: 19,
   [SupportedChainId.INK_SEPOLIA]: 21,
+  [SupportedChainId.MONAD_TESTNET]: 15,
 };
 
 export const SUPPORTED_CHAINS = [
@@ -166,6 +172,7 @@ export const SUPPORTED_CHAINS = [
   SupportedChainId.PLUME_SEPOLIA,
   SupportedChainId.HYPEREVM_TESTNET,
   SupportedChainId.INK_SEPOLIA,
+  SupportedChainId.MONAD_TESTNET,
 ];
 
 // Solana RPC endpoint