> ## Documentation Index > Fetch the complete documentation index at: https://circle-devdocs-test-ai-codegen-component.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # CCTP EVM Contracts and Interfaces > CCTP smart contracts for EVM-compatible blockchains ## Contract responsibilities * **TokenMessengerV2**: Entrypoint for cross-chain USDC transfer. Routes messages to burn USDC on a source chain, and mint USDC on a destination chain. * **MessageTransmitterV2**: Generic message passing. Sends all messages on the source chain, and receives all messages on the destination chain. * **TokenMinterV2**: Responsible for minting and burning USDC. Contains chain-specific settings used by burners and minters. * **MessageV2**: Provides helper functions for cross-chain transfers, such as `bytes32ToAddress` and `addressToBytes32`, which are commonly used when bridging between EVM and non-EVM chains. These conversions are simple: prepend 12 zero bytes to an EVM address, or strip them to convert back. **Note:** If you're writing your own integration, it's more gas-efficient to [include this logic directly in your contract](https://github.com/circlefin/evm-cctp-contracts/blob/5f1901a9791b18204e8556bb53fb0dfcb05a832a/src/messages/Message.sol#L146) rather than calling an external one. Full contract source code is [available on GitHub](https://github.com/circlefin/evm-cctp-contracts). ## Mainnet contract addresses ### TokenMessengerV2: Mainnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | --------------- | ----------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | | **Ethereum** | 0 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://etherscan.io/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Avalanche** | 1 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://snowtrace.io/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **OP Mainnet** | 2 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://optimistic.etherscan.io/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Arbitrum** | 3 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://arbiscan.io/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Base** | 6 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://basescan.org/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Polygon PoS** | 7 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://polygonscan.com/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Unichain** | 10 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://uniscan.xyz/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Linea** | 11 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://lineascan.build/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Codex** | 12 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://explorer.codex.xyz/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Sonic** | 13 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://sonicscan.org/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **World Chain** | 14 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://worldscan.org/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Sei** | 16 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://seitrace.com/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d?chain=pacific-1) | | **XDC** | 18 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://xdcscan.com/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **HyperEVM** | 19 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://hyperscan.com/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Ink** | 21 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://explorer.inkonchain.com/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | | **Plume** | 22 | [`0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d`](https://explorer.plume.org/address/0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d) | ### MessageTransmitterV2: Mainnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | --------------- | ----------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | | **Ethereum** | 0 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://etherscan.io/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Avalanche** | 1 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://snowtrace.io/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **OP Mainnet** | 2 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://optimistic.etherscan.io/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Arbitrum** | 3 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://arbiscan.io/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Base** | 6 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://basescan.org/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Polygon PoS** | 7 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://polygonscan.com/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Unichain** | 10 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://uniscan.xyz/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Linea** | 11 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://lineascan.build/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Codex** | 12 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://explorer.codex.xyz/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Sonic** | 13 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://sonicscan.org/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **World Chain** | 14 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://worldscan.org/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Sei** | 16 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://seitrace.com/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64?chain=pacific-1) | | **XDC** | 18 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://xdcscan.com/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **HyperEVM** | 19 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://hyperscan.com/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Ink** | 21 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://explorer.inkonchain.com/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | | **Plume** | 22 | [`0x81D40F21F12A8F0E3252Bccb954D722d4c464B64`](https://explorer.plume.org/address/0x81D40F21F12A8F0E3252Bccb954D722d4c464B64) | ### TokenMinterV2: Mainnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | --------------- | ----------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | | **Ethereum** | 0 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://etherscan.io/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Avalanche** | 1 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://snowtrace.io/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **OP Mainnet** | 2 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://optimistic.etherscan.io/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Arbitrum** | 3 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://arbiscan.io/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Base** | 6 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://basescan.org/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Polygon PoS** | 7 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://polygonscan.com/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Unichain** | 10 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://uniscan.xyz/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Linea** | 11 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://lineascan.build/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Codex** | 12 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://explorer.codex.xyz/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Sonic** | 13 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://sonicscan.org/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **World Chain** | 14 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://worldscan.org/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Sei** | 16 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://seitrace.com/address/0xfd78EE919681417d192449715b2594ab58f5D002?chain=pacific-1) | | **XDC** | 18 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://xdcscan.com/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **HyperEVM** | 19 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://hyperscan.com/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Ink** | 21 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://explorer.inkonchain.com/address/0xfd78EE919681417d192449715b2594ab58f5D002) | | **Plume** | 22 | [`0xfd78EE919681417d192449715b2594ab58f5D002`](https://explorer.plume.org/address/0xfd78EE919681417d192449715b2594ab58f5D002) | ### MessageV2: Mainnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | --------------- | ----------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | | **Ethereum** | 0 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://etherscan.io/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Avalanche** | 1 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://snowtrace.io/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **OP Mainnet** | 2 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://optimistic.etherscan.io/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Arbitrum** | 3 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://arbiscan.io/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Base** | 6 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://basescan.org/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Polygon PoS** | 7 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://polygonscan.com/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Unichain** | 10 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://uniscan.xyz/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Linea** | 11 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://lineascan.build/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Codex** | 12 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://explorer.codex.xyz/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Sonic** | 13 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://sonicscan.org/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **World Chain** | 14 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://worldscan.org/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Sei** | 16 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://seitrace.com/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78?chain=pacific-1) | | **XDC** | 18 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://xdcscan.com/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **HyperEVM** | 19 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://hyperscan.com/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Ink** | 21 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://explorer.inkonchain.com/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | | **Plume** | 22 | [`0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78`](https://explorer.plume.org/address/0xec546b6B005471ECf012e5aF77FBeC07e0FD8f78) | ## Testnet contract addresses ### TokenMessengerV2: Testnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | ----------------------- | ----------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | **Ethereum Sepolia** | 0 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://sepolia.etherscan.io/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Avalanche Fuji** | 1 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://testnet.snowtrace.io/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **OP Sepolia** | 2 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://sepolia-optimism.etherscan.io/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Arbitrum Sepolia** | 3 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://sepolia.arbiscan.io/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Base Sepolia** | 6 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://base-sepolia.blockscout.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Polygon PoS Amoy** | 7 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://amoy.polygonscan.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Unichain Sepolia** | 10 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://unichain-sepolia.blockscout.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Linea Sepolia** | 11 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://sepolia.lineascan.build/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Codex Testnet** | 12 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://explorer.codex-stg.xyz/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Sonic Testnet** | 13 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://blaze.soniclabs.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **World Chain Sepolia** | 14 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://sepolia.worldscan.org/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Sei Testnet** | 16 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://seitrace.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA?chain=atlantic-2) | | **XDC Apothem** | 18 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://testnet.xdcscan.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **HyperEVM Testnet** | 19 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://testnet.purrsec.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Ink Testnet** | 21 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://explorer-sepolia.inkonchain.com/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | | **Plume Testnet** | 22 | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://testnet-explorer.plume.org/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) | ### MessageTransmitterV2: Testnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | ----------------------- | ----------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | **Ethereum Sepolia** | 0 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://sepolia.etherscan.io/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Avalanche Fuji** | 1 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://testnet.snowtrace.io/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **OP Sepolia** | 2 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://sepolia-optimism.etherscan.io/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Arbitrum Sepolia** | 3 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://sepolia.arbiscan.io/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Base Sepolia** | 6 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://base-sepolia.blockscout.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Polygon PoS Amoy** | 7 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://amoy.polygonscan.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Unichain Sepolia** | 10 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://unichain-sepolia.blockscout.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Linea Sepolia** | 11 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://sepolia.lineascan.build/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Codex Testnet** | 12 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://explorer.codex-stg.xyz/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Sonic Testnet** | 13 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://blaze.soniclabs.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **World Chain Sepolia** | 14 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://sepolia.worldscan.org/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Sei Testnet** | 16 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://seitrace.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275?chain=atlantic-2) | | **XDC Apothem** | 18 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://testnet.xdcscan.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **HyperEVM Testnet** | 19 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://testnet.purrsec.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Ink Testnet** | 21 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://explorer-sepolia.inkonchain.com/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | | **Plume Testnet** | 22 | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://testnet-explorer.plume.org/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) | ### TokenMinterV2: Testnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | ----------------------- | ----------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | **Ethereum Sepolia** | 0 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://sepolia.etherscan.io/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Avalanche Fuji** | 1 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://testnet.snowtrace.io/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **OP Sepolia** | 2 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://sepolia-optimism.etherscan.io/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Arbitrum Sepolia** | 3 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://sepolia.arbiscan.io/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Base Sepolia** | 6 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://base-sepolia.blockscout.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Polygon PoS Amoy** | 7 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://amoy.polygonscan.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Unichain Sepolia** | 10 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://unichain-sepolia.blockscout.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Linea Sepolia** | 11 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://sepolia.lineascan.build/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Codex Testnet** | 12 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://explorer.codex-stg.xyz/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Sonic Testnet** | 13 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://blaze.soniclabs.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **World Chain Sepolia** | 14 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://sepolia.worldscan.org/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Sei Testnet** | 16 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://seitrace.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192?chain=atlantic-2) | | **XDC Apothem** | 18 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://testnet.xdcscan.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **HyperEVM Testnet** | 19 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://testnet.purrsec.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Ink Testnet** | 21 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://explorer-sepolia.inkonchain.com/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | | **Plume Testnet** | 22 | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://testnet-explorer.plume.org/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) | ### MessageV2: Testnet | Chain | [Domain](/cctp/cctp-supported-blockchains#cctp-supported-domains) | Address | | ----------------------- | ----------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | **Ethereum Sepolia** | 0 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://sepolia.etherscan.io/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Avalanche Fuji** | 1 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://testnet.snowtrace.io/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **OP Sepolia** | 2 | [`0xbac0179bb358a8936169a63408c8481d582390c4`](https://sepolia-optimism.etherscan.io/address/0xbac0179bb358a8936169a63408c8481d582390c4) | | **Arbitrum Sepolia** | 3 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://sepolia.arbiscan.io/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Base Sepolia** | 6 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://base-sepolia.blockscout.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Polygon PoS Amoy** | 7 | [`0xbac0179bb358a8936169a63408c8481d582390c4`](https://amoy.polygonscan.com/address/0xbac0179bb358a8936169a63408c8481d582390c4) | | **Unichain Sepolia** | 10 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://unichain-sepolia.blockscout.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Linea Sepolia** | 11 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://sepolia.lineascan.build/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Codex Testnet** | 12 | [`0xbac0179bb358a8936169a63408c8481d582390c4`](https://explorer.codex-stg.xyz/address/0xbac0179bb358a8936169a63408c8481d582390c4) | | **Sonic Testnet** | 13 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://blaze.soniclabs.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **World Chain Sepolia** | 14 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://sepolia.worldscan.org/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Sei Testnet** | 16 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://seitrace.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4?chain=atlantic-2) | | **XDC Apothem** | 18 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://testnet.xdcscan.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **HyperEVM Testnet** | 19 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://testnet.purrsec.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Ink Testnet** | 21 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://explorer-sepolia.inkonchain.com/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | | **Plume Testnet** | 22 | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://testnet-explorer.plume.org/address/0xbaC0179bB358A8936169a63408C8481D582390C4) | ## CCTP V2 Interface This section provides the **Smart Contract Interface** exposed by **CCTP V2**, outlining the available functions, and their parameters. The interface below serves as a reference for permissionless messaging functions exposed by the **TokenMessengerV2** and **MessageTransmitterV2** functions. ### Changes from CCTP V1 #### New functions * `TokenMessengerV2#depositForBurnWithHook` (extends `depositForBurn` by adding hook data) * `TokenMessengerV2#handleReceiveUnfinalizedMessage` (replaces `handleReceiveMessage`) * `TokenMessengerV2#handleReceiveFinalizedMessage` (replaces `handleReceiveMessage`) #### Modified functions * `TokenMessengerV2#depositForBurn` * `MessageTransmitterV2#sendMessage` * `MessageTransmitterV2#receiveMessage` #### Removed functions * `TokenMessengerV2#handleReceiveMessage` * `TokenMessengerV2#replaceDepositForBurn` * `TokenMessengerV2#depositForBurnWithCaller` * `MessageTransmitterV2#replaceMessage` * `MessageTransmitterV2#sendMessageWithCaller` ### TokenMessengerV2 #### depositForBurn Deposits and burns tokens from sender to be minted on destination domain, and emits a cross-chain message by calling MessageTransmitter's `sendMessage` function. Minted tokens will be transferred to `mintRecipient`. **Parameters** | Field | Type | Description | | ---------------------- | --------- | --------------------------------------------------------------------------------------------------------------------------------------- | | `amount` | `uint256` | Amount of tokens to deposit and burn | | `destinationDomain` | `uint32` | Destination domain ID to send the message to | | `mintRecipient` | `bytes32` | Address of mint recipient on destination domain (must be converted to 32 byte array, that is, prefix with zeros if needed) | | `burnToken` | `address` | Address of contract to burn deposited tokens on local domain | | `destinationCaller` | `bytes32` | Address as `bytes32` which can call `receiveMessage` on destination domain. If set to bytes32(0), any address can call `receiveMessage` | | `maxFee` | `uint256` | Max fee paid for fast burn, specified in units of `burnToken` | | `minFinalityThreshold` | `uint32` | Minimum finality threshold at which burn will be attested | #### depositForBurnWithHook Deposits and burns tokens from sender to be minted on destination domain, and emits a cross-chain message with additional hook data appended. In addition to the standard `depositForBurn` parameters, `depositForBurnWithHook` accepts a dynamic-length `hookData` parameter, allowing the caller to include additional metadata to the attested message, which can be used to trigger custom logic on the destination chain. **Parameters** | Field | Type | Description | | ---------------------- | --------- | --------------------------------------------------------------------------------------------------------------------------------------- | | `amount` | `uint256` | Amount of tokens to burn | | `destinationDomain` | `uint32` | Destination domain to send the message to | | `mintRecipient` | `bytes32` | Address of mint recipient on destination domain (must be converted to 32 byte array, that is, prefix with zeros if needed) | | `burnToken` | `address` | Address of contract to burn deposited tokens on local domain | | `destinationCaller` | `bytes32` | Address as `bytes32` which can call `receiveMessage` on destination domain. If set to bytes32(0), any address can call `receiveMessage` | | `maxFee` | `uint256` | Max fee paid for fast burn, specified in units of `burnToken` | | `minFinalityThreshold` | `uint32` | Minimum finality threshold at which burn will be attested | | `hookData` | `bytes` | Additional metadata attached to the attested message, which can be used to trigger custom logic on the destination chain | #### getMinFeeAmount Calculates and returns the minimum fee required for a given amount in a Standard Transfer. If the `minFee` (per unit of `burnToken`) is non-zero, the specified `maxFee` must be at least the returned minimum fee. Otherwise, the burn will revert onchain. **Parameters** | Field | Type | Description | | -------- | --------- | ----------------------------------------------------------------------------------------------- | | `amount` | `uint256` | The amount used to compute the minimum fee. Must be greater than `1` if standard fee is applied | #### handleReceiveFinalizedMessage Handles incoming message received by the local MessageTransmitter, and takes the appropriate action. For a burn message, mints the associated token to the requested recipient on the local domain. Validates the function sender is the local MessageTransmitter, and the remote sender is a registered remote TokenMessenger for `remoteDomain`. **Parameters** | Field | Type | Description | | --------------------------- | ------------------------ | ------------------------------------------------------------ | | `remoteDomain` | `uint32` | The domain where the message originated from | | `sender` | `bytes32` | The sender of the message (remote TokenMessenger) | | `finalityThresholdExecuted` | `uint32` | Specifies the level of finality Iris signed the message with | | `messageBody` | `bytes` (dynamic length) | The message body bytes | #### handleReceiveUnfinalizedMessage Handles incoming message received by the local MessageTransmitter, and takes the appropriate action. For a burn message, mints the associated token to the requested recipient on the local domain. Validates the function sender is the local MessageTransmitter, and the remote sender is a registered remote TokenMessenger for `remoteDomain`. Similar to `handleReceiveFinalizedMessage`, but is called for messages which are not finalized (`finalityThresholdExecuted` \< 2000). Unlike `handleReceiveFinalizedMessage`, `handleReceiveUnfinalizedMessage` has the following `messageBody` parameters: * **`expirationBlock`**. If `expirationBlock` ≤ `blockNumber` on the destination domain, the message will revert and must be re-signed without the expiration block. * **`feeExecuted`**. If nonzero, the `feeExecuted` is minted to the `feeRecipient`. **Parameters** | Field | Type | Description | | --------------------------- | ------------------------ | --------------------------------------------------------------------------------- | | `remoteDomain` | `uint32` | The domain where the message originated from | | `sender` | `bytes32` | The sender of the message (remote TokenMessenger) | | `finalityThresholdExecuted` | `uint32` | Specifies the level of finality Iris signed the message with | | `messageBody` | `bytes` (dynamic length) | The message body bytes (see [Message format](/cctp/technical-guide#message-body)) | ### MessageTransmitterV2 #### receiveMessage Receive message on destination chain by passing message and attestation. Emits `MessageReceived` event. Messages with a given nonce can only be broadcast successfully once for a pair of domains. The message body of a valid message is passed to the specified recipient for further processing. **Parameters** | Field | Type | Description | | ------------- | ------- | -------------------------------------------------------------------------- | | `message` | `bytes` | Encoded message (see [Message format](/cctp/technical-guide#message-body)) | | `attestation` | `bytes` | Signed attestation received from attestation service (Iris) | #### sendMessage Sends a message to the recipient on the destination domain. Emits a `MessageSent` event which will be attested by Circle's attestation service. **Parameters** | Field | Type | Description | | ---------------------- | --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `destinationDomain` | `uint32` | Destination domain ID to send the message to | | `recipient` | `bytes32` | Address of recipient on destination domain | | `destinationCaller` | `bytes32` | Address as `bytes32` which can call `receiveMessage` on destination domain. If set to bytes32(0), any address can call `receiveMessage` | | `minFinalityThreshold` | `uint32` | Minimum finality threshold requested.

Initially, supported values for `minFinalityThreshold` are \[1, 2000]. A value outside of the support values range will be interpreted as 2000 (finalized) by the attestation service (Iris).

For a value within the supported range, the attestation service (Iris) will attest the message with a `finalityThresholdExecuted` >= `minFinalityThreshold`.

Initial thresholds supported:

1000: Confirmed
2000: Finalized | | `messageBody` | `bytes` | App-specific message to be handled by recipient | ## CCTP V2 Workflow vs. CCTP V1 This table highlights the key workflow improvements of CCTP V2 over CCTP V1 in terms of enhanced cross-chain messaging, fewer manual steps, and greater control over message acceptance: | CCTP V2 | CCTP V1 | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Burn USDC via `depositForBurnWithHook`**

You can call `depositForBurnWithHook` on **TokenMessengerV2**, which supports **hooks** and **finality thresholds**. New parameters include `destinationCaller`, `maxFee`, and `minFinalityThreshold`, allowing you to choose **Fast Transfer (1000)** or **Standard Transfer (2000)**. | **Burn USDC via `depositForBurn`**

In CCTP V1, you call `depositForBurn` on **TokenMessenger**. | | **Retrieve, Hash, and Wait for Attestation**

Iris automates message retrieval and hashing, allowing you to just poll for attestation via [GET /v2/messages](/api-reference/cctp/all/get-messages-v-2). The attestation includes both the hashed message and the attestation signature. | **Retrieve and Hash Message explicitly**

In CCTP V1, you need to manually extract and hash the `messageBytes` data from the `MessageSent` event logs using `Keccak256`. | | **Wait for Attestation via Iris**

The attestation request is merged with message retrieval and hashing from the previous step. You simply wait for the polling to complete and retrieve the attestation. | **Request Attestation from Circle's Attestation Service**

In CCTP V1, you poll for attestation via [GET /v1/attestations](/api-reference/cctp/all/get-attestation). | | **Send Messages via `MessageTransmitterV2#sendMessage`**

The recipient must implement message handling methods based on finality thresholds:
• `handleReceiveFinalizedMessage` for messages with `finalityThresholdExecuted ≥ 2000` (fully finalized).
• `handleReceiveUnfinalizedMessage` for messages with `finalityThresholdExecuted < 2000` (pre-finalized).

This allows recipients to enforce specific finality requirements before accepting a message. | **Send Messages via `MessageTransmitter#sendMessage`**

In CCTP V1, you send an arbitrary message via `sendMessage` on **MessageTransmitter**. The recipient must implement `IMessageHandler#handleReceiveMessage` to process the message. |
**WHAT'S NEXT** * [CCTP Solana Programs and Interfaces ](/cctp/solana-programs)