The Arbitrum x402 marketplace

Pay-per-call tools for AI agents - settled in USDC on Arbitrum in ~2 seconds, no signup, no API keys. The wallet is the account.

An open index of the whole Arbitrum x402 economy - this host plus every independent seller the hourly crawl finds (CDP Bazaar included). Not a walled market: other venues' listings appear here too.

Latest settlement: $0.001 USDC · on-chain receipt · 2026-08-17T04:41:27.000Z

A paid canary buys tools over the Arbitrum rail daily (facilitator: PayAI) - uptime proven with real settlements, not pings.

Accept the Arbitrum CAIP-2 network (eip155:42161) in your 402 challenge - the PayAI facilitator verifies and settles, gas sponsored. Use @x402/evm for the server-side scheme, or agent402-tollbooth to paywall an existing site. Then serve /.well-known/x402 - list it on /sell (free) and the index crawler picks it up; ranking is health-based, listing is free. Want a guaranteed crawl? Open a seed request.

{
  "scheme": "exact",
  "network": "eip155:42161",
  "asset": "USDC",
  "payTo": "your-wallet"
}