# Autónomo Simple — Developers

> Spanish Tax & Government APIs. The largest collection of public APIs, fiscal
> validators and administrative services for Spain. Build accounting, invoicing,
> ERP, SaaS and compliance software for the Spanish market faster.

Portal: https://developers.autonomo-simple.es
App: https://www.autonomo-simple.es

## Fiscal validators (free public API, no key, CORS-open)

These are algorithmic validators. GET with ?value=, JSON response.

- Validate any Spanish fiscal id (NIF/NIE/CIF): GET /api/validate-nif?value=B12345674
  -> { value, valid, type: "NIF"|"NIE"|"CIF", entityType?, checks }
- Validate a Spanish CIF (+ entity type): GET /api/validate-cif?value=A58818501
  -> { value, valid, type: "CIF", entityType, checks }
- Validate a Spanish NIE: GET /api/validate-nie?value=X1234567L
  -> { value, valid, type: "NIE", checks }
- Validate an IBAN (any country, ISO 13616): GET /api/validate-iban?value=ES9121000418450200051332
  -> { value, valid, country, countryName, checks }

Example:
  fetch("https://developers.autonomo-simple.es/api/validate-nif?value=B12345674")
    .then((r) => r.json())
    .then(console.log)

## Public / government APIs documented (third-party, free)

- VIES (European Commission) — EU VAT number validation:
  https://ec.europa.eu/taxation_customs/vies/
- BDNS (IGAE) — Spanish public grants & subsidies database:
  https://www.infosubvenciones.es/bdnstrans/GE/es/api
- BOE / BORME (AEBOE) — Official State Gazette & Mercantile Registry open data:
  https://www.boe.es/datos/
- Catastro (DG del Catastro) — cadastral data & INSPIRE cartography:
  https://www.catastro.hacienda.gob.es/ws/Webservices_Libres.pdf
- INE (Instituto Nacional de Estadística) — official statistics API (Tempus3):
  https://www.ine.es/dyngs/DAB/index.htm?cid=1099
- datos.gob.es (Red.es) — national open-data catalogue:
  https://datos.gob.es/es/apidata
- ECB (European Central Bank) — euro reference exchange rates:
  https://data.ecb.europa.eu/help/api/overview

## Notes

- The validator endpoints above are generic utilities; they expose no user or
  business data from the Autónomo Simple application.
- Third-party APIs are operated by their respective public bodies; check each
  body's official terms of use. Autónomo Simple does not operate them.