Supported Networks

OpenFacilitator supports both x402 v1 (human-readable) and v2 (CAIP-2) network identifiers.

Network IDs

v1: Human-readable names like base, solana
v2: CAIP-2 format like eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp

Both versions are supported — use whichever you prefer.

Mainnets

Network	v1 ID	v2 ID (CAIP-2)	Chain ID	Type
Base	`base`	`eip155:8453`	8453	EVM
Polygon	`polygon`	`eip155:137`	137	EVM
Avalanche	`avalanche`	`eip155:43114`	43114	EVM
Sei	`sei`	`eip155:1329`	1329	EVM
IoTeX	`iotex`	`eip155:4689`	4689	EVM
Peaq	`peaq`	`eip155:3338`	3338	EVM
X Layer	`xlayer`	`eip155:196`	196	EVM
Solana	`solana`	`solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp`	—	Solana

Testnets

Network	v1 ID	v2 ID (CAIP-2)	Chain ID	Type
Base Sepolia	`base-sepolia`	`eip155:84532`	84532	EVM
Polygon Amoy	`polygon-amoy`	`eip155:80002`	80002	EVM
Avalanche Fuji	`avalanche-fuji`	`eip155:43113`	43113	EVM
Sei Testnet	`sei-testnet`	`eip155:1328`	1328	EVM
X Layer Testnet	`xlayer-testnet`	`eip155:195`	195	EVM
Solana Devnet	`solana-devnet`	`solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1`	—	Solana

Wallet Requirements

Type	Networks	Wallet Needed
EVM	Base, Polygon, Avalanche, Sei, IoTeX, Peaq, X Layer	1 EVM wallet (same address works on all chains)
Solana	Solana	1 Solana wallet

One EVM wallet works across all EVM networks. You don't need separate wallets per chain.

Using Network IDs

In SDK

import { getNetwork, toV2NetworkId } from '@openfacilitator/sdk';
 
// Get network info
const base = getNetwork('base');
console.log(base.chainId); // 8453
 
// Convert between versions
toV2NetworkId('base'); // 'eip155:8453'

In API Requests

Both work:

{ "network": "base" }
{ "network": "eip155:8453" }