Chainlink CCIP (chainlink-ccip)

Cross-Chain Interoperability Protocol by Chainlink. Cross-chain messaging with DON (Decentralized Oracle Network) security and token transfers.

Fact	Value
Category	Cross-chain messaging
Family	none
Namespace	`ChainlinkCcip` on ethereum, optimism, polygon, arc, base, arbitrum
Chains	ethereum, optimism, polygon, arc, base, arbitrum

Notes

Uses CCIP chain selectors (uint64), NOT EVM chain IDs. Each supported chain has a unique selector
Fees can be paid in native token (ETH) or LINK token
Use getFee() to estimate costs before sending
Supports both message-only and message+token transfers in a single call
DON-based security with Chainlink oracle network — no external validators needed
Finality: typically 5-20 minutes depending on source chain finality
Rate limits apply per lane (source-destination pair)
On Arc (5042) a native-paid fee is USDC at 18 decimals, from the same balance as the USDC ERC-20 0x3600…0000. The router’s getWrappedNative() is 0x8DFa585699CB46ca2a5fA649700f09839B4b8743 (CCIP_USDC, a WETH9-style wrapper over native USDC), CCIP’s own fee token rather than a canonical wrapped native

On Ethereum, ChainlinkCcip is a namespace: its contracts need no import.

function main() {
  // Ethereum's router, `0x80226fc0Ee2b096224EeAc085Bb9a8cba1146f7D`.
  require(ChainlinkCcip.Router != 0);
}

Chain	Contract	Address	In a program
Ethereum	router	`0x80226fc0Ee2b096224EeAc085Bb9a8cba1146f7D`	`ChainlinkCcip.Router`
Optimism	router	`0x3206695CaE29952f4b0c22a169725a865bc8Ce0f`	`ChainlinkCcip.Router`
Polygon	router	`0x849c5ED5a80F5B408Dd4969b78c2C8fdf0565Bfe`	`ChainlinkCcip.Router`
Arc	router	`0xB79791184973589c38e114D43Eb8E4588C283A18`	`ChainlinkCcip.Router`
Base	router	`0x881e3A65B4d4a04dD529061dd0071cf975F58bCD`	`ChainlinkCcip.Router`
Arbitrum One	router	`0x141fa059441E0ca23ce184B6A78bafD2A517DdE8`	`ChainlinkCcip.Router`

import CCIPRouterABI from "./protocols/chainlink-ccip/CCIPRouterABI.json"; Speaks for: router.

ccipSend(uint64 destinationChainSelector, (bytes receiver, bytes data, (address token, uint256 amount)[] tokenAmounts, address feeToken, bytes extraArgs) message) payable returns (bytes32 messageId)
getFee(uint64 destinationChainSelector, (bytes receiver, bytes data, (address token, uint256 amount)[] tokenAmounts, address feeToken, bytes extraArgs) message) view returns (uint256 fee)
isChainSupported(uint64 chainSelector) view returns (bool)