Chainlink CCIP API Reference Documentation

Available Versions

Latest Release

• CCIP v1.5.1 (Current Version)
  • Added support for tokens with different decimals across chains
  • Enhanced token pool upgrades to support multiple active pools, ensuring in-flight messages remain deliverable during upgrades
  • Added decimal validation and overflow protection
  • Upgraded token pool access control from OwnerIsCreator to Ownable2StepMsgSender for better security
  • Added support for OpenZeppelin's AccessControl DEFAULT_ADMIN_ROLE in token admin registration
  • Introduced BurnMintERC20 contract for easy token deployment and cross-chain expansion
    • Configurable decimals and max supply
    • Built-in CCIP admin support
    • Role-based access control for minting and burning

Previous Versions

• CCIP v1.5.0 (Legacy Version)
  • Base implementation
  • Cross-chain:
    • Send arbitrary data
    • Transfer tokens
    • Programmable Token Transfers
  • Cross-Chain Token (CCT) standard
  • ⚠️ We recommend upgrading to v1.5.1 for latest features

Documentation Structure

Each version includes detailed documentation for:

• Core Contracts (Router, Receiver)
• Token Pool Implementations
• Registry Components
• Interface Definitions
• Library Definitions
• Error Handling