x402 v2 · Multi-chain · Gasless

RelAI Facilitator

Accept payments in your API
with one line of code

Turn any endpoint into a paid resource using x402.
No wallets, no gas, no billing logic.

https://facilitator.x402.fi

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server.ts

$ npm install @relai-fi/x402

import { relai } from "@relai-fi/x402"

app.use(relai({
  price: "0.001",
  wallet: "your-address"
}))

Every request to your API now requires payment

How it works

From HTTP request to on-chain payment

Payments settle automatically in seconds.

Client sends request

Client hits your API endpoint

SDK verifies payment

x402 header is validated

Facilitator executes

On-chain transfer fires

API returns response

Your handler runs normally

What the facilitator does

Handles everything behind the scenes

You don't need to manage wallets, gas or blockchain logic.

Verifies payments — Validates x402 headers and signatures

Executes on-chain transfers — Signs and broadcasts USDC transactions

Sponsors gas fees — RelAI pays gas — users pay zero

Confirms settlement — Waits for on-chain confirmation

Your API

Express / Fastify / any framework

RelAI Facilitator

verify · execute · confirm

Blockchain

Solana · Base · Avalanche · SKALE

Why use RelAI

Built for developers

No billing infrastructure

No subscriptions, invoices or usage tracking.

One line integration

Add payments to any endpoint instantly.

Gasless for users

RelAI sponsors all transaction costs.

Multi-chain by default

Works across Solana and EVM networks.

Quick example

Protect a paid endpoint

Three lines. That's it.

api.ts

app.get("/premium-data",
  relai({ price: "0.002" }),
  (req, res) => {
    res.json({ data: "paid response" })
  }
)

API endpoints

Base URL

https://facilitator.x402.fi

POST/verify

Checks if the request includes a valid payment.

POST/settle

Executes on-chain transfer.

GET/activity

Real-time payment events.

GET/live-settlements

Recent on-chain transactions.

Live data

Real-time settlement

Payments are executed instantly on-chain.

Settles (24h)

Active chains0

Last update—

Volume (24h)

$0.00

USDC settled via RelAI

Active chains

No data yet

Live feed

Auto-refresh 30s

—

Activity Trends

Hourly · last 24h

Volume

$0.00

———

$0$0$0$0

Time (UTC)0 settles in window

Settlement cadence

0 settles across window

———

Last refresh

—

LIVE

No recent settlements

Supported networks

Works across multiple chains

All transactions settle in USDC.

◎

Solana (SPL)

Mainnet & Devnet

SPL Token

⬡

Base · Avalanche · Polygon

EVM-compatible chains

EIP-3009

⚡

SKALE (zero gas)

SKALE Base & BITE

Zero gas

Security model

Secure by design

No private keys for agents

Capped spending via budgets

Server never stores secrets

Deterministic payment verification

Start accepting payments in your API

Integrate x402 in minutes and turn any endpoint into a paid resource.

Start building View docs