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

# Supported testnets

> Testnet networks, assets, and faucets for settler agents.

**Celo Sepolia and Tron Shasta are used as a running example across the Settle payments guides — a starting point, not a limit.** Atum supports many additional EVM networks, plus Solana, with more chains on the way. See [Supported networks](/get-started/reference/supported-networks) for the full gateway list.

The reference agent template ships preconfigured for the Celo Sepolia ↔ Tron Shasta corridor. The EVM plugin can point at any supported EVM testnet, and additional corridors can be enabled — [email support@atum.xyz](mailto:support@atum.xyz) to enable networks beyond the template defaults.

The tables below list the generally supported source-deposit tokens on each testnet, not every token `/v1/defaults` returns. That endpoint is still the authoritative live allowlist — a token absent there cannot be deposited, whatever this page says. Tempo Moderato (`eip155:42431`) is omitted here because its corridors are access-gated. Tron Shasta USDC is still served by the gateway and omitted here because USDC on Tron is no longer officially supported.

## Networks

| Network          | CAIP-2 chain ID                           | Gas token | Explorer                                                                |
| ---------------- | ----------------------------------------- | --------- | ----------------------------------------------------------------------- |
| Ethereum Sepolia | `eip155:11155111`                         | ETH       | [sepolia.etherscan.io](https://sepolia.etherscan.io/)                   |
| Optimism Sepolia | `eip155:11155420`                         | ETH       | [sepolia-optimism.etherscan.io](https://sepolia-optimism.etherscan.io/) |
| Arbitrum Sepolia | `eip155:421614`                           | ETH       | [sepolia.arbiscan.io](https://sepolia.arbiscan.io/)                     |
| Base Sepolia     | `eip155:84532`                            | ETH       | [sepolia.basescan.org](https://sepolia.basescan.org/)                   |
| Polygon Amoy     | `eip155:80002`                            | POL       | [amoy.polygonscan.com](https://amoy.polygonscan.com/)                   |
| Avalanche Fuji   | `eip155:43113`                            | AVAX      | [testnet.snowtrace.io](https://testnet.snowtrace.io/)                   |
| Celo Sepolia     | `eip155:11142220`                         | CELO      | [celo-sepolia.blockscout.com](https://celo-sepolia.blockscout.com/)     |
| Tron Shasta      | `tron:shasta`                             | TRX       | [shasta.tronscan.org](https://shasta.tronscan.org/)                     |
| Solana devnet    | `solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1` | SOL       | [solscan.io](https://solscan.io/?cluster=devnet)                        |

***

## Assets

Asset identifiers follow the [CAIP-19](https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-19.md) standard — use them when configuring a settler agent. All testnet assets below use 6 decimals.

<Warning>
  A ticker is not a unique identifier. The same symbol maps to different tokens on
  different chains, and a single chain can host multiple versions of the "same" asset —
  native vs. bridged or wrapped (e.g. Polygon's native `USDC` and bridged `USDC.e` are
  distinct tokens). Always identify an asset by its full CAIP-19 string, never by ticker.
  See [Supported assets](/get-started/reference/supported-assets) for the exact identifier
  on each chain.
</Warning>

| Network          | Asset | CAIP-19                                                                                    |
| ---------------- | ----- | ------------------------------------------------------------------------------------------ |
| Ethereum Sepolia | USDC  | `eip155:11155111/erc20:0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238`                         |
| Ethereum Sepolia | USDT  | `eip155:11155111/erc20:0xaA8E23Fb1079EA71e0a56F48a2aA51851D8433D0`                         |
| Ethereum Sepolia | PYUSD | `eip155:11155111/erc20:0xCaC524BcA292aaade2DF8A05cC58F0a65B1B3bB9`                         |
| Optimism Sepolia | USDC  | `eip155:11155420/erc20:0x5fd84259d66Cd46123540766Be93DFE6D43130D7`                         |
| Arbitrum Sepolia | USDC  | `eip155:421614/erc20:0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d`                           |
| Arbitrum Sepolia | PYUSD | `eip155:421614/erc20:0x637A1259C6afd7E3AdF63993cA7E58BB438aB1B1`                           |
| Base Sepolia     | USDC  | `eip155:84532/erc20:0x036CbD53842c5426634e7929541eC2318f3dCF7e`                            |
| Polygon Amoy     | USDC  | `eip155:80002/erc20:0x41E94Eb019C0762f9Bfcf9Fb1E58725BfB0e7582`                            |
| Avalanche Fuji   | USDC  | `eip155:43113/erc20:0x5425890298aed601595a70AB815c96711a31Bc65`                            |
| Avalanche Fuji   | USDT  | `eip155:43113/erc20:0x134Dc38AE8C853D1aa2103d5047591acDAA16682`                            |
| Celo Sepolia     | USDC  | `eip155:11142220/erc20:0x01C5C0122039549AD1493B8220cABEdD739BC44E`                         |
| Tron Shasta      | USDT  | `tron:shasta/trc20:TG3XXyExBkPp9nzdajDZsozEu4BkaSJozs`                                     |
| Solana devnet    | USDC  | `solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1/spl:4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU` |

***

## Faucets

| Network        | Token      | Faucet                                                            |
| -------------- | ---------- | ----------------------------------------------------------------- |
| EVM testnets   | USDC       | [faucet.circle.com](https://faucet.circle.com/)                   |
| Celo Sepolia   | CELO (gas) | [faucet.celo.org](https://faucet.celo.org/celo-sepolia)           |
| Tron Shasta    | TRX + USDT | Discord "Tron Developers and SRs", channel `#faucet-shasta-coins` |
| Other networks | Gas token  | Each network's official testnet faucet                            |

<Info>
  To see which networks the gateway currently supports, call its [health endpoint](/get-started/reference/supported-networks#testnet-support).
</Info>