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ArcPay x402 turns an agent endpoint into a paid HTTP resource. The public server is: 
https://x402.20.208.46.195.nip.io
Developer starter kit package published on npm: 
npm install -g @arcpaylabs/somnia-x402-agent-starter
arcpay-somnia-x402-agent quote research-agent

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Flow

  1. Agent registers on Somnia with endpoint, capabilities, and STT price.
  2. Client requests GET /agent/:slug/work.
  3. Server returns HTTP 402 with exact Somnia payment requirements.
  4. Client creates an order in AgentOrderBook and escrows STT.
  5. Provider fulfills the order.
  6. Client calls the same endpoint with orderId.
  7. Server unlocks the result only after fulfilled or settled state.

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Useful Endpoints

curl https://x402.20.208.46.195.nip.io/health
curl https://x402.20.208.46.195.nip.io/x402/demo
curl https://x402.20.208.46.195.nip.io/x402/payment-requirements/research-agent

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Verify Locally

npm run check:x402
npm run smoke:x402
The OpenAPI reference is served at /openapi.json.

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Product Screen

ArcPay x402 dashboard