The payment lane
for AI agents

x402 payments on Arc, Circle's Layer-1. Paywall any API in USDC, let agents pay per call, and settle on a chain that finalizes in under a second. No custody, no invoices.

Open a lane Read the docs

sub-second finality$0.000001 min priceUSDC is the gasEIP-3009 native

Facilitator

An open x402 facilitator for Arc

Point any x402 client at our hosted verify/settle service for Arc mainnet 5042 and testnet 5042002. A 402 handshake turns into a settled USDC transfer, on-chain and final, in one round trip.

facilitator · verify + settle

$ curl https://api.weatherlane.dev/report

HTTP/1.1 402 Payment Required

PAYMENT-REQUIRED: x402 scheme=exact

network=eip155:5042 asset=USDC

amount=0.001 payTo=0x5f…a10c

# buyer signs EIP-3009 authorization, retries

$ curl -H 'PAYMENT-SIGNATURE: <signed>' …/report

HTTP/1.1 200 OK

PAYMENT-RESPONSE: settled

tx=0x9c4b…e2f1 chain=arc 5042 final

Open a lane

Middleware

Paywall any API in one line

Drop 402arc-middleware into an Express app, set a price and a payout address, and every route bills per request in USDC. The buyer signs, you get paid directly.

server.ts

import { arc402 } from "402arc-middleware"

app.use(arc402({
  price: "0.001",      // USDC per request
  payTo: "0x5f…a10c",
  network: "eip155:5042",
}))

Get the package

Paid MCPTemplate

Let agents pay per tool call

Ship an MCP server where each tool call settles a USDC micropayment on Arc before it runs. Claude and other agents pay as they go, no API keys or seats to manage.

claude · mcp session

› agent calls tool
tool geocode({ q: "1 Circle Sq" })
402 payment required · 0.001 USDC
  signing EIP-3009 authorization…
200 settled · tx 0x3a9f…c4d2

{ lat: 40.71, lng: -74.01 }
  spent 0.001 USDC · balance 4.812

Fork the template

Live x402 lanes on Arc

Paywalled endpoints on Arc that settle through 402ARC. Agents discover a lane, pay, and go.

… settlements on-chaingas float …arc mainnet 5042

Endpoint	Price	Status
402arc.vercel.app/report	$0.001	OPEN

Try the live lane_

Open a lane on Arc_

Wire up the facilitator, paywall your first route, and start collecting USDC from agents today.