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

# Network Support

> Settle on any EVM-compatible chain. Need one that isn't listed? Let us know.

Prism can settle on any EVM-compatible chain. Merchants configure which chains and tokens to accept in the [Prism Console](https://apps.fd.xyz/prism/).

## Enabled Chains

The chains below are enabled today. Need one that isn't listed? [Contact us](/overview/resources/support).

### Mainnet

| Chain    | Chain ID | Settlement Time | Gas Cost |
| -------- | -------- | --------------- | -------- |
| Base     | 8453     | \~2 seconds     | Very low |
| Arbitrum | 42161    | \~2 seconds     | Very low |
| BSC      | 56       | \~3 seconds     | Low      |
| Ethereum | 1        | \~12 seconds    | Higher   |

## Enabled Tokens

Prism supports any ERC-20 token that implements [ERC-3009](https://eips.ethereum.org/EIPS/eip-3009) (`transferWithAuthorization`). The tokens below are enabled today. Need one that isn't listed? [Contact us](/overview/resources/support).

| Token             | Symbol | Chains                        |
| ----------------- | ------ | ----------------------------- |
| First Digital USD | FDUSD  | Ethereum, BSC                 |
| USD Coin          | USDC   | Ethereum, Base, BSC, Arbitrum |

<Note>
  In x402 payment requirements, the `asset` field is the token's **ERC-20 contract address** — not the symbol shown above. See the [API Reference](/prism/api-reference/endpoints) for example values.
</Note>

## Choosing a Chain

L2 chains (Base, Arbitrum) offer the fastest settlement and lowest gas. Consider these factors when choosing:

| Factor                           | Guidance                         |
| -------------------------------- | -------------------------------- |
| API monetization / micropayments | Base or Arbitrum (low gas, fast) |
| Large value transactions         | Ethereum (deepest liquidity)     |
| FDUSD settlement                 | BSC or Ethereum                  |
| Maximum agent compatibility      | Accept multiple chains           |

<Tip>
  Accept payments on multiple chains to maximize compatibility with different
  agent wallets. Settlement is simplest when both the agent and merchant operate
  on the same chain.
</Tip>

## Environments

| Component     | URL                          |
| ------------- | ---------------------------- |
| Prism Gateway | `https://prism-gw.fd.xyz`    |
| Prism Console | `https://apps.fd.xyz/prism/` |

Test your integration on production with small amounts. The API and SDK work identically regardless of transaction size.