Nexwave Gateway — Unified Crosschain USDC for OpenClaw Agents

What This Skill Does

Circle Gateway gives you a single unified USDC balance that is instantly accessible on any supported chain in under 500 milliseconds. Instead of holding separate USDC balances on Ethereum, Base, Avalanche, etc., you deposit USDC into Gateway on any chain and can mint it out on any other chain — instantly.

This is fundamentally different from bridging. There are no liquidity pools, no bridge operators, no 15-minute waits. Gateway uses a deposit → sign burn intent → receive attestation → mint flow that executes in <500ms.

Supported Chains (Testnet)

Note: Arc is Circle's purpose-built L1 blockchain where USDC is the native gas token. No separate gas token needed — USDC covers everything. Arc has the fastest Gateway finality at ~0.5 seconds.

Gateway Contracts (same address on all EVM chains):

• Gateway Wallet: 0x0077777d7EBA4688BDeF3E311b846F25870A19B9
• Gateway Minter: 0x0022222ABE238Cc2C7Bb1f21003F0a260052475B

Gateway API (testnet): https://gateway-api-testnet.circle.com/v1

Prerequisites

1. Circle Developer Account with API key and entity secret (https://console.circle.com)
2. The circle-wallet skill installed (clawhub install eltontay/circle-wallet) with a wallet set containing wallets on ETH-SEPOLIA, BASE-SEPOLIA, and ARC-TESTNET
3. Testnet USDC from https://faucet.circle.com (20 USDC per address per chain, every 2 hours)
4. Testnet ETH for gas on Sepolia/Base Sepolia (use Google's Sepolia faucet). On Arc, USDC is the native gas token — same faucet covers everything.
5. Node.js installed with the viem, dotenv, and @circle-fin/developer-controlled-wallets packages

How To Use This Skill

Step 1: Setup the Project

Run the setup script to initialize the project with all dependencies:

cd /path/to/nexwave-gateway && bash setup.sh

This creates a gateway-app/ directory with all necessary files pre-configured.

Step 2: Check Gateway Info and Your Balance

cd gateway-app && node check-balance.js

This queries the Gateway API for supported chains and shows your unified USDC balance across all chains.

Step 3: Deposit USDC into Gateway

node deposit.js

This deposits USDC into the Gateway Wallet contract on Ethereum Sepolia and Arc Testnet. After deposit and chain finality, your unified balance is credited. Arc finalizes in ~0.5 seconds; Ethereum may take up to 20 minutes.

Step 4: Transfer USDC Crosschain Instantly

node transfer.js