> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hedera.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Chainlink CCIP

> Learn how Chainlink’s Cross-Chain Interoperability Protocol (CCIP) integrates with Hedera to enable secure cross-chain messaging and token transfers.

## Chainlink CCIP on Hedera

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.

***

## 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

<Warning>
  **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**.
</Warning>

***

## Getting Started with CCIP on Hedera

To explore CCIP functionality, start with the [**Hedera CCIP Demo Repository**](https://github.com/mgarbs/hedera-ccip-demos), which showcases **bi-directional cross-chain messaging** between the **Hedera Testnet** and **Ethereum Sepolia** using the Chainlink CCIP JavaScript SDK.

<Columns cols={3}>
  <Card title="➡ DEMO REPO" href="https://github.com/mgarbs/hedera-ccip-demos" arrow>
    Explore Chainlink CCIP cross-chain message passing between Hedera and Ethereum Sepolia.
  </Card>

  {" "}

  <Card title="➡ CCIP SDK" href="https://docs.chain.link/ccip/ccip-javascript-sdk" arrow>
    Learn how to integrate CCIP in your JavaScript dApps.
  </Card>

  <Card title="➡ TOKEN MANAGER" href="https://tokenmanager.chain.link/" arrow>
    Deploy and manage Cross-Chain Tokens (CCTs) with a no-code interface.
  </Card>
</Columns>

***

### Setup

1. **Install dependencies**

   ```bash theme={null}
   pnpm install
   ```

2. **Configure your environment**

   ```bash theme={null}
   cp .env.example .env
   ```

   Add your Hedera Testnet private key:

   ```
   PRIVATE_KEY=0x...
   ```

3. **Run a demo**

   ```bash theme={null}
   pnpm run demo:hedera-sepolia-link
   ```

***

## Available Demos

| Direction        | Payment | Command                              | Description                                            |
| ---------------- | ------- | ------------------------------------ | ------------------------------------------------------ |
| Read-only        | —       | `pnpm run demo:readonly`             | Query CCIP configuration without sending transactions. |
| Hedera → Sepolia | LINK    | `pnpm run demo:hedera-sepolia-link`  | Send a message using LINK for fees.                    |
| Hedera → Sepolia | WHBAR   | `pnpm run demo:hedera-sepolia-whbar` | Send a message using Wrapped HBAR for fees.            |
| Sepolia → Hedera | ETH     | `pnpm run demo:sepolia-hedera`       | Send a message using ETH for fees.                     |

<Info>
  💡 **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.
</Info>

***

## Network Configuration

### Hedera Testnet

| Parameter          | Value                                        |
| ------------------ | -------------------------------------------- |
| **Network Name**   | Hedera Testnet                               |
| **RPC Endpoint**   | `https://testnet.hashio.io/api`              |
| **Chain ID**       | `296`                                        |
| **CCIP Router**    | `0x802C5F84eAD128Ff36fD6a3f8a418e339f467Ce4` |
| **Chain Selector** | `222782988166878823`                         |

[**Add Hedera Testnet**](https://chainlist.org/chain/296)

***

### Ethereum Sepolia

| Parameter          | Value                                        |
| ------------------ | -------------------------------------------- |
| **Network Name**   | Ethereum Sepolia                             |
| **Chain ID**       | `11155111`                                   |
| **CCIP Router**    | `0x0BF3dE8c5D3e8A2B34D2BEeB17ABfCeBaf363A59` |
| **Chain Selector** | `16015286601757825753`                       |

[**Add Ethereum Sepolia**](https://chainlist.org/chain/11155111)

***

## Token Addresses

| Network              | Token | Address                                      |
| -------------------- | ----- | -------------------------------------------- |
| **Hedera Testnet**   | LINK  | `0x90a386d59b9A6a4795a011e8f032Fc21ED6FEFb6` |
| **Hedera Testnet**   | WHBAR | `0xb1F616b8134F602c3Bb465fB5b5e6565cCAd37Ed` |
| **Ethereum Sepolia** | LINK  | `0x779877A7B0D9E8603169DdbD7836e478b4624789` |

<Info>
  ⚠️ **Note:** WHBAR uses **8 decimals**, while most EVM tokens use **18
  decimals**.
</Info>

***

## Developer Considerations

### 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](/evm/differences).

### Cross-Chain Fees

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

### Message Timing

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

***

## Test Tokens and Faucets

| Network | Token | Faucet                                                               |
| ------- | ----- | -------------------------------------------------------------------- |
| Hedera  | HBAR  | [Hedera Faucet](https://portal.hedera.com/faucet)                    |
| Hedera  | LINK  | [Chainlink Hedera Faucet](https://faucets.chain.link/hedera-testnet) |
| Sepolia | ETH   | [Chainlink Sepolia Faucet](https://faucets.chain.link/sepolia)       |

***

## Additional Resources

* [**CCIP Documentation**](https://docs.chain.link/ccip)
* [**CCIP Token Manager**](https://tokenmanager.chain.link/)
* [**CCIP SDK (JavaScript)**](https://docs.chain.link/ccip/ccip-javascript-sdk)
* [**Hedera CCIP Demo Repository**](https://github.com/mgarbs/hedera-ccip-demos)
* [**HashScan Explorer**](https://hashscan.io/testnet)
* [**Chainlink Faucets**](https://faucets.chain.link/)

***

## 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**](/evm/integrations/cross-chain/layerzero) and **Hashport**, positioning Hedera as a key network in the interoperable web3 ecosystem.