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This page gets you set up quickly as a merchant (server) or a buyer (client). Choose your language and framework below to get started.
Scroll to the end to see all supported blockchain networks.

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Servers (Merchants)

Express

Quickstart for building an x402-enabled server with Express.

Hono

Quickstart for building an x402-enabled server with Hono.

NextJS

NextJS server quickstart is coming soon.

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Clients (Buyers)

Axios

Quickstart for building an x402 client with Axios.

Fetch

Quickstart for building an x402 client with Fetch.

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Facilitator

All PayAI starter templates include @payai/facilitator, which automatically connects to the PayAI facilitator at https://facilitator.payai.network. No manual URL configuration needed. 
import { facilitator } from "@payai/facilitator";
import { HTTPFacilitatorClient } from "@x402/core/server";

const facilitatorClient = new HTTPFacilitatorClient(facilitator);
The facilitator works immediately on the free tier. When you’re ready for production, set PAYAI_API_KEY_ID and PAYAI_API_KEY_SECRET environment variables to authenticate — see Facilitator Pricing. The PayAI facilitator supports the following endpoints:
  • /supported - see which networks and schemes are supported
  • /verify - verify that a payment is valid
  • /settle - settle the payment
  • /discovery/resources - view the bazaar, a marketplace of merchants
Read the reference for more information on the facilitator endpoints and responses.

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Supported networks

The PayAI facilitator supports x402 on the following networks:
Network NameV1 Network StringV2 CAIP-2 ID
Avalancheavalancheeip155:43114
Avalanche Fujiavalanche-fujieip155:43113
Basebaseeip155:8453
Base Sepoliabase-sepoliaeip155:84532
Polygonpolygoneip155:137
Polygon Amoypolygon-amoyeip155:80002
Seiseieip155:1329
Sei Testnetsei-testneteip155:713715
SKALE Baseskale-baseeip155:1187947933
SKALE Base Sepoliaskale-base-sepoliaeip155:324705682
Solanasolanasolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
Solana Devnetsolana-devnetsolana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1
X Layerxlayereip155:196
X Layer Testnetxlayer-testneteip155:1952

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