Release Notes - Stablecoins - 2025

• Added support for CCTP v2 on the Sei mainnet.
• Updated CCTP V2 Fast Transfer fee and standard message attestation time for Codex.

Added the following Quickstart to showcase how to transfer USDC on the Sei testnet:

• Quickstart: Set up and transfer USDC on Sei

Updated the following documentation to reflect support for Sei:

• CCTP Overview
• CCTP Contract Addresses and Interfaces
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• Supported Domains

Updated the following documentation to reflect updates to Codex:

• Required Block Confirmations
• Finality Thresholds and Fees

Added support on CCTP V2 for USYC transfers between Ethereum and BNB Smart Chain.

Updated documentation to reflect support for USYC transfers between Ethereum and BNB Smart Chain using CCTP V2:

• Supported Domains
• CCTP Supported Blockchains
• Required Block Confirmations

• Added support for USDC on the Sei mainnet and testnet.
• Added support for CCTP V2 on the Sei testnet.
• Added support for CCTP V2 Standard Transfer fee switch.

Updated the following documentation to reflect support for USDC on Sei and CCTP v2 on Sei testnet:

• USDC Contract Addresses
• CCTP Supported Blockchains
• CCTP Contract Addresses and Interfaces

Updated the following documentation to reflect support for the CCTP V2 Standard Transfer fee switch, including an explainer, a new getMinFeeAmount function, and a new security audit, respectively:

• CCTP Finality Threshold and Fees
• CCTP Contract Addresses and Interfaces
• CCTP FAQ

Added support for CCTP V2 on the Polygon PoS mainnet.

Updated the following documentation to reflect support for Polygon:

• CCTP Overview
• CCTP Contract Addresses and Interfaces
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• Supported Domains

Added support for CCTP V2 on the Unichain mainnet.

Updated the following documentation to reflect support for Unichain mainnet:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• CCTP Contract Addresses and Interfaces

Added support for CCTP V2 on the Codex mainnet.

Updated the following documentation to reflect support for Codex mainnet:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• CCTP Contract Addresses and Interfaces

Added support for CCTP V2 on the Solana mainnet.

Updated the following documentation to reflect support for Solana mainnet:

• CCTP Overview
• Finality Thresholds and Fees
• CCTP Supported Blockchains
• CCTP Contract Addresses and Interfaces
• Solana Programs

Added support for CCTP V2 on the OP Mainnet.

Updated the following documentation to reflect support for OP Mainnet:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces

• Added support for USDC on the Ripple Ledger (XRPL).
• Added a Quickstart for USDC on XRPL, featuring a script that demonstrates how to set up a USDC trustline, and prepare the wallet to receive USDC.

Updated the following documentation to reflect support for XRPL:

• USDC Contract Addresses - Mainnet
• USDC Contract Addresses - Testnet

Added the following documentation to reflect support for XRPL:

• Quickstart: Set up a USDC trustline on XRPL

• Added support for CCTP V2 on the following chains: Unichain Sepolia, Solana Devnet, Polygon PoS Amoy.
• Added a new CCTP V2 endpoint that retrieves both Fast and Standard Transfer fees, and deprecated the endpoint that retrieves Fast Transfer fees only.

Updated the following documentation to reflect support for Unichain Sepolia testnet:

• CCTP Contract Addresses and Interfaces
• CCTP Supported Blockchains

Updated the following documentation to reflect support for the Solana Devnet:

• CCTP Supported Blockchains
• Supported Domains
• Required Block Confirmations
• Solana Programs

Updated the following documentation to reflect support for the Polygon PoS Amoy testnet:

• CCTP Contract Addresses and Interfaces
• CCTP Supported Blockchains

Added the following CCTP V2 API endpoint:

• GET /v2/burn/USDC/fees/:sourceDomainId/:destDomainId

Deprecated the following CCTP V2 API endpoint:

• GET /v2/fastBurn/USDC/fees/:sourceDomainId/:destDomainId

• Added support for USDC and CCTP V2 on the Codex mainnet and testnet.
• Added support for CCTP V2 on the OP Sepolia testnet.

Updated the following documentation to reflect support for Codex chain and OP Sepolia testnet:

• USDC Contract Addresses
• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces
• Supported Domains

• Added support for USDC bridge-to-native upgrade on World Chain.
• Added support for CCTP V2 on World Chain mainnet and Sepolia testnet.

Updated the following documentation to reflect support for World Chain:

• USDC Contract Addresses
• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces
• Supported Domains

• Added support for USDC bridge-to-native upgrade on Sonic.
• Added CCTP V2 support for Sonic.

Added the following documentation on Sonic support:

• Quickstart: Set up and Transfer USDC on Sonic

Updated the following documentation to reflect support for Sonic:

• USDC Contract Addresses
• CCTP Supported Blockchains
• CCTP Required Block Confirmations
• CCTP Contract Addresses and Interfaces

The following Circle Products have been renamed:

This name change is part of a broader effort to simplify and align our product naming, creating a more unified developer experience across the Circle platform.

Added support for CCTP V2 on the Linea mainnet.

Updated the following documentation to reflect CCTP V2 support on the Linea mainnet:

• CCTP Supported Blockchains
• Supported Domains
• CCTP Contract Addresses and Interfaces

Added support for CCTP V2 on the Linea Sepolia testnet.

Updated the following documentation to reflect CCTP V2 support on the Linea Sepolia testnet:

• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces

Added support for USDC on the Linea blockchain.

Updated the following documentation to include USDC contract addresses for Linea:

• USDC Contract Addresses

Added CCTP V2 support, featuring Fast Transfer mode, to the following mainnets:

• Avalanche
• Base
• Ethereum

• Added the CCTP V2 white paper URL to the CCTP Getting Started page.
• Added CCTP V2 support to the CCTP Sample App.

Updated the following documentation to reflect CCTP V2 support on the newly added mainnets:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• CCTP Contract Addresses and Interfaces
• Supported Domains
• CCTP FAQ

Removed the Ecosystem Catalog. For sample apps, visit the Sample Projects page.

Added CCTP V2 support to the CCTP Quickstart:

• Quickstart: Transfer USDC on testnet from Ethereum to Avalanche

Added support for CCTP v1 on the Unichain blockchain.

Updated the following documentation to reflect CCTP V1 support on Unichain:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces
• Supported Domains

Launched the CCTP V2 solution, featuring Fast Transfer mode, on the following testnets:

• Avalanche Fuji
• Base Sepolia
• Ethereum Sepolia

Added the following documentation to reflect CCTP V2 support:

• CCTP APIs
• Finality Thresholds and Fees
• CCTP Supported Blockchains

Updated the following documentation to reflect CCTP V2 support:

• CCTP Overview
• Generalized Message Passing
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces
• Supported Domains
• CCTP limits for burning and minting
• CCTP Message Format
• CCTP FAQ

Added the following CCTP V2 API endpoints:

• GET /v2/publicKeys
• GET /v2/messages/:sourceDomainId
• POST /v2/reattest/:nonce
• GET /v2/fastBurn/USDC/allowance
• GET /v2/fastBurn/USDC/fees/:sourceDomainId/:destDomainId

Added a Quickstart for USDC on Aptos, featuring a web app that demonstrates how to transfer USDC.

• Quickstart: Set up and transfer USDC on Aptos

Launched the Paymaster solution.

Added the following documentation to support the Paymaster launch:

• Paymaster Overview
• Quickstart: Circle Paymaster
• Paymaster Addresses and Events

Added support for CCTP v1 on the Aptos blockchain.

Added the following documentation to reflect CCTP v1 support on Aptos:

• Aptos Packages
• Quickstart: Transfer USDC on testnet between Aptos and Base

Updated the following documentation to reflect CCTP v1 support on Aptos:

• CCTP Overview
• Generalized Message Passing
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• CCTP Contract Addresses and Interfaces
• Supported Domains
• CCTP FAQ

Added support for USDC on the Aptos mainnet.

Updated the following documentation to include USDC contract addresses for Aptos:

• USDC Contract Addresses