> ## 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.

# Supported Blockchains and Domains

> Blockchains and domain identifiers supported by CCTP

CCTP is available on multiple blockchains where USDC is natively issued. Each
blockchain is assigned a unique domain identifier used in
[CCTP contracts](/cctp/references/contract-addresses) and API calls.

## Supported blockchains

CCTP provides
[Standard Transfer](/cctp/concepts/finality-and-block-confirmations#standard-transfer-attestation-times),
[Fast Transfer](/cctp/concepts/finality-and-block-confirmations#fast-transfer-attestation-times),
Hooks, and [Forwarding Service](/cctp/concepts/forwarding-service) capabilities
on the following blockchains. All chains listed below are supported as
destination chains.

| Blockchain                  | Source (Standard transfer) | Source (Fast transfer) | Forwarding Service |
| --------------------------- | -------------------------- | ---------------------- | ------------------ |
| Arc Testnet                 | ✅                          | ❌                      | ✅                  |
| Arbitrum                    | ✅                          | ✅                      | ✅                  |
| Avalanche                   | ✅                          | ❌                      | ✅                  |
| Base                        | ✅                          | ✅                      | ✅                  |
| BNB Smart Chain (USYC only) | ✅                          | ✅                      | ❌                  |
| Codex                       | ✅                          | ✅                      | ✅                  |
| EDGE                        | ✅                          | ✅                      | ✅                  |
| Ethereum                    | ✅                          | ✅                      | ✅                  |
| HyperEVM                    | ✅                          | ❌                      | ✅                  |
| Injective                   | ✅                          | ❌                      | ❌                  |
| Ink                         | ✅                          | ✅                      | ✅                  |
| Linea                       | ✅                          | ✅                      | ✅                  |
| Monad                       | ✅                          | ❌                      | ✅                  |
| Morph                       | ✅                          | ✅                      | ❌                  |
| OP Mainnet                  | ✅                          | ✅                      | ✅                  |
| Pharos                      | ✅                          | ❌                      | ❌                  |
| Plume                       | ✅                          | ✅                      | ✅                  |
| Polygon PoS                 | ✅                          | ❌                      | ✅                  |
| Sei                         | ✅                          | ❌                      | ✅                  |
| Solana                      | ✅                          | ✅                      | ✅                  |
| Sonic                       | ✅                          | ❌                      | ✅                  |
| Starknet                    | ✅                          | ✅                      | ❌                  |
| Stellar Testnet             | ✅                          | ✅                      | ❌                  |
| Unichain                    | ✅                          | ✅                      | ✅                  |
| World Chain                 | ✅                          | ✅                      | ✅                  |
| XDC                         | ✅                          | ❌                      | ✅                  |

<Note>
  On Stellar, USDC precision and address encoding differ from other CCTP-supported
  blockchains. For inbound transfers, use
  [`CctpForwarder`](/cctp/references/stellar#use-cctpforwarder-for-stellar-recipients)
  so funds reach the correct recipient. See
  [CCTP on Stellar](/cctp/references/stellar).
</Note>

<Note>
  **Forwarding Service support:**

  The column labeled "Forwarding Service" indicates whether the blockchain is
  available as a destination chain for the
  [Circle Forwarding Service](/cctp/concepts/forwarding-service).

  **Testnet support:**

  If a mainnet is listed, its official testnet is also supported. For example,
  Ethereum includes both Ethereum Mainnet and Ethereum Sepolia.

  **Fast Transfer availability:**

  [Fast Transfer](/cctp/concepts/fast-transfer-allowance) is available for source
  chains only when it provides a meaningful speed improvement over standard burn
  attestation times. For blockchains where standard attestation is already fast,
  Fast Transfer does not provide additional value.
</Note>

## Domain identifiers

A domain is a Circle-issued identifier for a blockchain where CCTP contracts are
deployed. Domain identifiers don't map to existing public chain IDs.

Use domain identifiers when calling CCTP contracts and API endpoints:

| Domain | Blockchain      |
| :----- | :-------------- |
| 0      | Ethereum        |
| 1      | Avalanche       |
| 2      | OP Mainnet      |
| 3      | Arbitrum        |
| 5      | Solana          |
| 6      | Base            |
| 7      | Polygon PoS     |
| 10     | Unichain        |
| 11     | Linea           |
| 12     | Codex           |
| 13     | Sonic           |
| 14     | World Chain     |
| 15     | Monad           |
| 16     | Sei             |
| 17     | BNB Smart Chain |
| 18     | XDC             |
| 19     | HyperEVM        |
| 21     | Ink             |
| 22     | Plume           |
| 25     | Starknet        |
| 26     | Arc Testnet     |
| 27     | Stellar         |
| 28     | EDGE            |
| 29     | Injective       |
| 30     | Morph           |
| 31     | Pharos          |

## Supported tokens

Not all domains support the same tokens:

* [USDC](/stablecoins/what-is-usdc): Supported on all CCTP domains except BNB
  Smart Chain
* [USYC](/tokenized/usyc/overview): Supported only on Ethereum and BNB Smart
  Chain

## CCTP V1 (Legacy) only

The following blockchains are supported only by CCTP V1 (Legacy). If you are
building on these chains, refer to the [V1 documentation](/cctp/v1) for
integration guides and contract references.

| Blockchain | Domain | Documentation                                                                                                 |
| ---------- | ------ | ------------------------------------------------------------------------------------------------------------- |
| Aptos      | 9      | [Aptos packages](/cctp/v1/aptos-packages), [Quickstart](/cctp/v1/transfer-usdc-on-testnet-from-aptos-to-base) |
| Noble      | 4      | [Noble Cosmos module](/cctp/v1/noble-cosmos-module)                                                           |
| Sui        | 8      | [Sui packages](/cctp/v1/sui-packages), [Quickstart](/cctp/v1/transfer-usdc-on-testnet-from-sui-to-ethereum)   |