USDC Bridge Skill

Bridge USDC between chains in one command using Circle CCTP.

What It Does

Move USDC between Ethereum, Base, Arbitrum, Optimism, Polygon, and Avalanche using Circle's Cross-Chain Transfer Protocol (CCTP).

• Native USDC — Not wrapped tokens, real USDC on each chain
• No fees — CCTP is free (only gas costs)
• One command — Handles approval, burn, attestation, and mint
• Resumable — If interrupted, pick up where you left off

Quick Start

# Install dependencies
npm install

# Set your wallet key
export WALLET_PRIVATE_KEY=0x...

# Bridge 50 USDC from Base to Arbitrum
node scripts/bridge.js bridge 50 --from base --to arbitrum

Commands

# Bridge USDC
node scripts/bridge.js bridge <amount> --from <chain> --to <chain>

# Check bridge status / resume interrupted bridge
node scripts/bridge.js status <txHash>

# Estimate gas costs
node scripts/bridge.js estimate <amount> --from <chain> --to <chain>

# List supported chains
node scripts/bridge.js chains

# View pending bridges
node scripts/bridge.js pending

Supported Chains

| Chain | Domain | |-------|--------| | Ethereum | 0 | | Avalanche | 1 | | Optimism | 2 | | Arbitrum | 3 | | Base | 6 | | Polygon | 7 |

How CCTP Works

┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│   Source    │     │   Circle    │     │    Dest     │
│   Chain     │────▶│ Attestation │────▶│   Chain     │
│  (burn)     │     │  (~13 min)  │     │   (mint)    │
└─────────────┘     └─────────────┘     └─────────────┘

1. USDC is burned on source chain via TokenMessenger