_Cross-Chain Transfer Protocol (CCTP) is a permissionless on-chain utility that can burn native USDC on a source chain and mint native USDC of the same amount on a destination chain. This is made possible by two primary CCTP contracts found on each chain, MessageTransmitter and TokenMessenger._

## Contract responsibilities

• **[TokenMessenger](🔗)**: Entrypoint for cross-chain USDC transfer. Routes messages to burn USDC on source chain, and mint USDC on destination chain.

• **[MessageTransmitter](🔗)**: Generic message passing. Sends all messages on the source chain, and receives all messages on the destination chain.

• **TokenMinter**: Responsible for minting and burning USDC. Contains chain-specific settings used by minters and burners.

\*Full contract source code is available at <https://github.com/circlefin/evm-cctp-contracts>

## Mainnet contract addresses

### TokenMessenger: Mainnet

### MessageTransmitter: Mainnet

### TokenMinter: Mainnet

## Testnet contract addresses

### TokenMessenger: Testnet

### MessageTransmitter: Testnet

### TokenMinter: Testnet

The relationship between these contracts is outlined in the diagram below: