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The Chainlink Cross-Chain Interoperability Protocol (CCIP) is a standard for blockchain interoperability that enables developers to build secure cross-chain applications capable of transferring tokens, sending messages, and executing actions across multiple blockchains. Through the Cross-Chain Token (CCT) standard, CCIP allows token developers to integrate new or existing tokens in a self-serve way—without vendor lock-in or restrictive dependencies. CCTs support:
  • Self-serve deployments with full control and ownership
  • Zero-slippage transfers across supported chains
  • Enhanced programmability via configurable rate limits
  • Smart Execution for reliable cross-chain delivery
CCIP is powered by Chainlink Decentralized Oracle Networks (DONs)—infrastructure that has secured tens of billions of dollars and enabled over $21 trillion in on-chain transaction value.

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Overview of CCIP and HTS Compatibility

On Hedera, CCIP extends interoperability between Hedera’s Hashgraph network and EVM-compatible blockchains such as Ethereum.
It integrates seamlessly with both the Hedera Token Service (HTS) and standard EVM tokens (ERC-20 and ERC-721), enabling developers to bridge tokens, data, and logic across ecosystems. With CCIP, developers can:
  • Send and receive arbitrary messages between chains
  • Execute programmable cross-chain logic via Chainlink’s oracle network
  • Use LINK, Wrapped HBAR (WHBAR), or ETH as fee tokens
  • Prepare for Cross-Chain Token (CCT) transfers once fully enabled on Hedera
Note: Cross-Chain Token (CCT) transfers on Hedera are currently in progress on testnet. Current demos focus on message passing between Hedera Testnet and Ethereum Sepolia.

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Getting Started with CCIP on Hedera

To explore CCIP functionality, start with the Hedera CCIP Demo Repository, which showcases bi-directional cross-chain messaging between the Hedera Testnet and Ethereum Sepolia using the Chainlink CCIP JavaScript SDK.

➡ DEMO REPO

Explore Chainlink CCIP cross-chain message passing between Hedera and Ethereum Sepolia.

➡ CCIP SDK

Learn how to integrate CCIP in your JavaScript dApps.

➡ TOKEN MANAGER

Deploy and manage Cross-Chain Tokens (CCTs) with a no-code interface.

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Setup

  1. Install dependencies 
    pnpm install
  2. Configure your environment 
    cp .env.example .env
    Add your Hedera Testnet private key: 
    PRIVATE_KEY=0x...
  3. Run a demo 
    pnpm run demo:hedera-sepolia-link

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Available Demos

DirectionPaymentCommandDescription
Read-only—pnpm run demo:readonlyQuery CCIP configuration without sending transactions.
Hedera → SepoliaLINKpnpm run demo:hedera-sepolia-linkSend a message using LINK for fees.
Hedera → SepoliaWHBARpnpm run demo:hedera-sepolia-whbarSend a message using Wrapped HBAR for fees.
Sepolia → HederaETHpnpm run demo:sepolia-hederaSend a message using ETH for fees.
💡 Tip: Wrap HBAR before running WHBAR examples: bash pnpm run wrap-hbar All demos operate on testnet and are for educational purposes only. They are not audited and should not be used in production.

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Network Configuration

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Hedera Testnet

ParameterValue
Network NameHedera Testnet
RPC Endpointhttps://testnet.hashio.io/api
Chain ID296
CCIP Router0x802C5F84eAD128Ff36fD6a3f8a418e339f467Ce4
Chain Selector222782988166878823
Add Hedera Testnet

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Ethereum Sepolia

ParameterValue
Network NameEthereum Sepolia
Chain ID11155111
CCIP Router0x0BF3dE8c5D3e8A2B34D2BEeB17ABfCeBaf363A59
Chain Selector16015286601757825753
Add Ethereum Sepolia

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Token Addresses

NetworkTokenAddress
Hedera TestnetLINK0x90a386d59b9A6a4795a011e8f032Fc21ED6FEFb6
Hedera TestnetWHBAR0xb1F616b8134F602c3Bb465fB5b5e6565cCAd37Ed
Ethereum SepoliaLINK0x779877A7B0D9E8603169DdbD7836e478b4624789
⚠️ Note: WHBAR uses 8 decimals, while most EVM tokens use 18 decimals.

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Developer Considerations

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Decimal Precision

HBAR’s smallest unit is the tinybar (8 decimals). Since CCIP on EVM networks operates with 18-decimal precision, conversions between tinybars and wei-based values may be required. See Understanding Hedera’s EVM Differences and Compatibility.

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Cross-Chain Fees

Ensure your wallet holds sufficient LINK, WHBAR, or ETH to cover CCIP transaction fees.

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Message Timing

Cross-chain message delivery on testnet may take several minutes while the Chainlink oracle network finalizes execution.

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Test Tokens and Faucets

NetworkTokenFaucet
HederaHBARHedera Faucet
HederaLINKChainlink Hedera Faucet
SepoliaETHChainlink Sepolia Faucet

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Additional Resources

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Summary

Chainlink CCIP establishes a universal standard for secure, decentralized cross-chain interoperability. It connects Hedera to a broader multi-chain ecosystem—enabling assets, logic, and state to move across blockchains through a unified protocol. On Hedera, CCIP provides a modular, future-ready foundation for interoperability, supporting HTS and EVM token compatibility under the CCT standard. This complements other interoperability solutions such as LayerZero and Hashport, positioning Hedera as a key network in the interoperable web3 ecosystem.