x402 List

x402 Protocol Service Directory

Submit a Service or Facilitator

Add your x402-compatible service to the directory. Browse existing services to see what's already listed. After submission, we will automatically probe your endpoints for valid HTTP 402 responses, then manually review the results before listing. You can also use our API to submit programmatically. Submissions on free hosting or dev-tunnel domains (vercel.app, workers.dev, ngrok, trycloudflare, etc.) are not accepted: please submit from your own domain.

Running a payment facilitator instead? Switch the form to Facilitator: we check your settler addresses for real on-chain settlement activity, then review manually before listing. Browse existing facilitators.

SUBMISSION FORM

Submission type *

Service: an API that answers HTTP 402. Facilitator: settlement infrastructure that executes x402 payments on-chain.

List your x402-protected endpoint paths, one per line. Each will be probed for HTTP 402.

Resubmitting a service that was rejected less than 14 days ago requires a $0.50 x402 payment. That needs an x402-capable client, so submit it programmatically via the API. After 14 days, and for first-time or still-pending submissions, this form stays free.

HOW IT WORKS

  1. 1. Submit your service or facilitator details
  2. →
  3. 2. We probe endpoints (HTTP 402) or settler addresses (on-chain)
  4. →
  5. 3. Manual review & approval
  6. →
  7. 4. Listed in directory

REQUIREMENTS

Services must respond with HTTP 402 Payment Required and a valid x402 accepts[] payload on protected endpoints. All submissions are manually reviewed before appearing in the directory. See About for more on how the protocol works.

Facilitators must operate settler addresses with real x402 settlement activity on-chain. We probe the submitted addresses for recent USDC settles on the supported chains; approved facilitators are listed right away and marked on-chain once settlement volume is measured.

One submission per email address every 7 days, tracked separately for services and facilitators. Submissions still pending after the 7-day review window are automatically rejected, and you will be notified by email either way.