> ## Documentation Index
> Fetch the complete documentation index at: https://docs.x402x.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported tokens and networks

> How to choose tokens, warm up cache, and query support

## Choose tokens

* Prefer mainstream stablecoins that natively support EIP-3009 or Permit (USDC/USDT/DAI, etc.)
* If unsure, just use auto detection (default)

## Warm-up and allowlist

```ts theme={null}
await server.initialize([USDC, DAI]); // warm up on startup
const { supportedMethods } = await detector.detect(USDC);
```

## Dynamic capability query

```ts theme={null}
const all = await facilitator.supported(); // { kinds, networks, ... }
```

<Note>
  Use the correct network and token addresses for different environments. Recommended to store in .env.
</Note>