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

# CCTP chain domains V1

> Mapping of supported CCTP V1 domains

<Warning>
  **This is CCTP V1 version. For the latest version, see [CCTP](/cctp)**.
</Warning>

A **domain** is a Circle-issued identifier for a blockchain where CCTP V1
contracts are deployed. Domains do not map to any existing public chain ID.

## CCTP V1 Domains

| Domain | Name        |
| :----- | :---------- |
| 0      | Ethereum    |
| 1      | Avalanche   |
| 2      | OP          |
| 3      | Arbitrum    |
| 4      | Noble       |
| 5      | Solana      |
| 6      | Base        |
| 7      | Polygon PoS |
| 8      | Sui         |
| 9      | Aptos       |
| 10     | Unichain    |