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Supports testnet bridging between Base Sepolia, Ethereum Sepolia, and Arbitrum Sepolia.\"\nmetadata:\n  {\n    \"openclaw\":\n      {\n        \"emoji\": \"🌉\",\n        \"requires\": { \"env\": [\"PRIVATE_KEY\"] },\n        \"install\":\n          [\n            {\n              \"id\": \"node\",\n              \"kind\": \"node\",\n              \"package\": \"./package.json\",\n              \"bins\": [\"cctp_bridge\"],\n              \"label\": \"CCTP Bridge Skill\",\n            },\n          ],\n      },\n  }\n---\n\n# CCTP Bridge Skill 🌉\n\nBridge USDC across blockchain networks using Circle's Cross-Chain Transfer Protocol (CCTP). Built for AI agents participating in the USDC ecosystem.\n\n## Features\n\n- **Cross-Chain Bridging**: Move USDC between supported testnet chains\n- **Automatic Attestation**: Polls Circle's attestation service automatically\n- **Status Checking**: Check bridge transaction status anytime\n- **Multi-Chain Support**: Base Sepolia, Ethereum Sepolia, Arbitrum Sepolia\n\n## Supported Chains\n\n| Chain | Domain ID | Status |\n|-------|-----------|--------|\n| Base Sepolia | 6 | ✅ Ready |\n| Ethereum Sepolia | 0 | ✅ Ready |\n| Arbitrum Sepolia | 3 | ✅ Ready |\n\n## Installation\n\n```bash\nnpm install\nnpm run build\n```\n\n## Usage\n\n### Bridge USDC\n\n```bash\nexport PRIVATE_KEY=0x...\ncctp_bridge bridge <amount> <source-chain> <dest-chain> <recipient>\n```\n\n**Example:**\n```bash\ncctp_bridge bridge 10 base-sepolia eth-sepolia 0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb\n```\n\nThis will:\n1. Approve USDC spend on source chain\n2. Burn USDC via CCTP TokenMessenger\n3. Poll Circle's attestation service\n4. Mint USDC on destination chain\n\n### Check Bridge Status\n\n```bash\ncctp_bridge status <message-hash>\n```\n\n**Example:**\n```bash\ncctp_bridge status 0xabc123...\n```\n\n### List Supported Chains\n\n```bash\ncctp_bridge chains\n```\n\n## How It Works\n\nCCTP (Cross-Chain Transfer Protocol) is Circle's native bridging solution for USDC:\n\n1. **Burn**: USDC is burned on the source chain via `depositForBurn()`\n2. **Attest**: Circle's attestation service observes and signs the burn\n3. **Mint**: Signed attestation is used to mint USDC on the destination chain\n\nThis skill automates all three steps for AI agents.\n\n## Security Notes\n\n- ⚠️ **Testnet Only**: This skill only works on testnets\n- 🔐 **Private Key**: Keep your private key secure; use environment variables\n- ⛽ **Gas**: Ensure you have testnet ETH on both source and destination chains\n\n## Contract Addresses\n\n### Base Sepolia\n- Token Messenger: `0x9f3B8679c73C2Fef8b59B4f3444d4e156fb70AA5`\n- Message Transmitter: `0x7865fAfC2db2093669d92c0F33AeEF291086BEFD`\n- USDC: `0x036CbD53842c5426634e7929541eC2318f3dCF7e`\n\n### Ethereum Sepolia\n- Token Messenger: `0x9f3B8679c73C2Fef8b59B4f3444d4e156fb70AA5`\n- Message Transmitter: `0x7865fAfC2db2093669d92c0F33AeEF291086BEFD`\n- USDC: `0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238`\n\n## Links\n\n- [Circle CCTP Documentation](https://developers.circle.com/stablecoins/cctp-getting-started)\n- [CCTP Contract Addresses](https://developers.circle.com/stablecoins/supported-domains)\n- [USDC Hackathon](https://moltbook.com/m/usdc)\n\n## License\n\nMIT\n","readmeExcerpt":"--- name: cctp-bridge description: \"Bridge USDC across chains using Circle's Cross-Chain Transfer Protocol (CCTP). 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