Release Notes - Stablecoins - 2025

• Added support for USDC bridge to native upgrade for World Chain.
• Added CCTP v2 support for World Chain mainnet and Sepolia testnet.

Updated the following documentation to reflect World Chain support:

• USDC Contract Addresses
• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• EVM Smart Contracts
• Supported Domains

Added support for USDC bridge to native upgrade for Sonic.

Updated the following documentation to reflect Sonic support:

• USDC Contract Addresses

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 CCTP v2 support to the Linea mainnet.

Updated the following documents to support CCTP v2 on the Linea mainnet:

• CCTP Supported Blockchains
• Supported Domains
• EVM Smart Contracts

Added CCTP v2 support to the Linea Sepolia testnet.

Updated the following documents to support CCTP v2 on the Linea Sepolia testnet:

• CCTP Supported Blockchains
• Required Blockchain Confirmations
• EVM Smart Contracts

Added support for USDC on the Linea blockchain.

Updated the following documents 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 documents to support CCTP v2 on the new mainnets:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• Finality Thresholds and Fees
• EVM Smart Contracts
• Supported Domains
• CCTP FAQ

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

Added CCTP v2 support to CCTP Quickstart:

• Quickstart: Transfer USDC on testnet from Ethereum to Avalanche

Added support for CCTP v1 on the Unichain blockchain.

Updated the following documents to support CCTP v1 on Unichain:

• CCTP Overview
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• EVM Smart Contracts
• Supported Domains

Launched the CCTP v2 solution, featuring Fast Transfer mode, on the following testnets:

• Avalanche Fuji
• Base Sepolia
• Ethereum Sepolia

Added the following documents to reflect CCTP v2 support:

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

Updated the following documents to reflect CCTP v2 support:

• CCTP Overview
• Generalized Message Passing
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• EVM Smart Contracts
• 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 Quickstart for USDC on Aptos, featuring a web app that transfers USDC.

• Quickstart: Set up and transfer USDC on Aptos

Launched the Paymaster solution.

Added the following documents 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 document to reflect CCTP v1 support on Aptos:

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

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

• CCTP Overview
• Generalized Message Passing
• CCTP Supported Blockchains
• Required Blockchain Confirmations
• EVM Smart Contracts
• Supported Domains
• CCTP FAQ

Added support for USDC on the Aptos mainnet.

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

• USDC Contract Addresses