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

# Supported chains and tokens

> Which chains and tokens BYO wallets support, and ERC-3009 availability.

## Supported chains and tokens

BYO wallets support a subset of the chains available for managed wallets. Unlike managed wallets, BYO wallets on Tempo are not supported in Phase 1 — address monitoring is only available on EVM-compatible chains.

## Supported chains

| Chain    | Chain ID | Tokens     | x402 (ERC-3009) | Deposit monitoring | Testnet                   |
| -------- | -------- | ---------- | --------------- | ------------------ | ------------------------- |
| Base     | 8453     | USDC       | ✓               | ✓                  | Base Sepolia (84532)      |
| Ethereum | 1        | USDC, USDT | ✓               | ✓                  | Sepolia (11155111)        |
| Optimism | 10       | USDC       | ✓               | ✓                  | OP Sepolia (11155420)     |
| Arbitrum | 42161    | USDC       | ✓               | ✓                  | Arbitrum Sepolia (421614) |
| Polygon  | 137      | USDC       | ✓               | ✓                  | Polygon Amoy (80002)      |
| Tempo    | 4217     | —          | —               | —                  | —                         |

Tempo is not supported for BYO wallets in Phase 1. Use a managed wallet for Tempo/MPP payments.

## Using the Chain enum

```typescript theme={null}
import { initialise, Chain, Token } from '@prudra/core';
import { registerBYOWallet } from '@prudra/wallet';

initialise({ apiKey: process.env.PRUDRA_API_KEY! });

// Base USDC wallet
const baseWallet = await registerBYOWallet({
  address:         '0x742d35Cc...',
  chain:           Chain.BASE,
  supportedTokens: [Token.USDC],
});

// Ethereum wallet monitoring both USDC and USDT
const ethWallet = await registerBYOWallet({
  address:         '0x742d35Cc...',
  chain:           Chain.ETHEREUM,
  supportedTokens: [Token.USDC, Token.USDT],
});
```

## Token details

| Token | Contract standard | Chains                                      |
| ----- | ----------------- | ------------------------------------------- |
| USDC  | ERC-20, ERC-3009  | Base, Ethereum, Optimism, Arbitrum, Polygon |
| USDT  | ERC-20            | Ethereum                                    |

USDC implements ERC-3009 (transferWithAuthorization), which is required for x402 payments. USDT does not implement ERC-3009 — it can be monitored for deposits but cannot be used in x402 payment flows.

## Monitoring scope

When you register a BYO wallet with `supportedTokens: [Token.USDC]`, Prudra only fires `deposit.success` webhooks for USDC transfers. Other token transfers to the same address are ignored.

To monitor multiple tokens, include them all in `supportedTokens`:

```typescript theme={null}
await registerBYOWallet({
  address:         '0x742d35Cc...',
  chain:           Chain.ETHEREUM,
  supportedTokens: [Token.USDC, Token.USDT],  // both monitored
});
```

## Plan limits

| Plan       | BYO wallets |
| ---------- | ----------- |
| Hobby      | 1           |
| Pro        | 5           |
| Enterprise | Unlimited   |

Each registered BYO wallet counts against your plan limit regardless of how many tokens it monitors. One wallet address on one chain = one slot.

## Related

* [Register a BYO wallet](/wallets/byo/register) — registration guide
* [Monitor deposits](/wallets/byo/monitor-deposits) — how deposit detection works
* [Managed wallet chains](/wallets/managed/supported-chains) — chains available for managed wallets