zFINIA

Build & Earn

Build your first x402 API

A competent developer should leave this page with a working unpaid 402 and a deterministic paid handler.

zFinia published 7 September 2026. No guaranteed-income claims.

Start with one route, one JSON schema, one exact price, and one deterministic result. Do not invent a marketplace, a wallet product, or a guaranteed-income story.

Minimum viable machine-purchasable API

  • Document the outcome in one sentence.
  • Freeze input and output JSON Schema with additionalProperties: false.
  • On unpaid POST, return HTTP 402 with live payment requirements.
  • On paid retry, validate input, then return the documented result.
  • Keep private keys off the seller process. Receive-only.

This website does not run x402 settlement. Use the educational contract on https://api.zfinia.com/v1/learn and the live paid catalogue at https://api.zfinia.com/openapi.json. Copy patterns, not secrets.

Do not put a seller private key in the server. Do not paste a seed phrase into an agent prompt.

Machine copy: https://api.zfinia.com/v1/learn