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cctp-bridging

Use when building cross-chain USDC transfers, integrating with Circle's Cross-Chain Transfer Protocol (CCTP V2), or using Circle Gateway for unified balances. Covers the burn-attestation-mint flow, MessageTransmitter and TokenMessenger contracts, domain IDs for all chains, Gateway Wallet/Minter addresses, and Solidity integration patterns.

skills/cctp-bridging/SKILL.md

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Oct 23, 2026
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# CCTP Bridging — Circle Cross-Chain Transfer Protocol

## Architecture Overview

Cross-Chain Transfer Protocol (CCTP) enables **native** USDC transfers between chains through a burn-and-mint mechanism:

1. **Burn** — USDC is burned on the source chain via `TokenMessenger.depositForBurn()`
2. **Attest** — Circle's offchain attestation service observes the burn event and produces a signed attestation
3. **Mint** — Fresh USDC is minted on the destination chain via `MessageTransmitter.receiveMessage()`

This is **not** a lock-and-unlock bridge. USDC is destroyed on the source chain and recreated on the destination chain. There are no wrapped tokens, no liquidity pools, and no bridge TVL risk. Circle is the sole minter/burner.

### CCTP V2 Improvements