Paraguay RUC check

Q: Can I check RUCs from code or in bulk?

Yes. The same check is available over the REST API (GET /v1/py/ruc/{id}) and the MCP server, with the same key as every other country. See the API docs.

Check that a Paraguay RUC is well formed and its check digit is right, before you pay or onboard a supplier. Format only

Example: 80016096-7 (published example). No account needed: 10 lookups a day per network, shared with the keyless API.

What this check tells you

Format only

We check the structure and the check digit published by the issuing authority, offline. That catches typos and made-up numbers. It does not show that the business exists, is registered or is active, so a well-formed number gets review, never pass. To confirm registration, use the official lookup: DNIT (ex SET): perfil público del contribuyente.

Paraguay ID formats we check

ID type	Level	Check digit	API endpoint	Official lookup
RUC Registro Único del Contribuyente (RUC)	Format only	Mod 11 with weights 2, 3, 4… from the right	`GET /v1/py/ruc/{id}`	DNIT (ex SET): perfil público del contribuyente

From code

Same key and quota as every other country. A well-formed request costs one lookup; a source that does not answer returns HTTP 503 and is not counted.

curl "https://taxid.halpii.com/v1/py/ruc/80016096-7" \
  -H "Authorization: Bearer $KEY"

Get a no-cost API key (100 lookups a day) or read the API docs.

Questions

Does a valid RUC mean the company exists?

No. This is a format check: it confirms the structure and check digit, not that the business exists or is active. Confirm registration with DNIT (ex SET): perfil público del contribuyente.

Where does the data come from?

No registry is queried. The rules come from the issuing authority's published format and check-digit algorithm (Mod 11 with weights 2, 3, 4… from the right).

Can I check RUCs from code or in bulk?

Yes. The same check is available over the REST API (GET /v1/py/ruc/{id}) and the MCP server, with the same key as every other country. See the API docs.

Is this service affiliated with the Paraguay tax authority?

No. HALPII Tax ID is an independent service run by HALPII S.A.C. (Lima, Peru). Results are informational, not legal or tax advice.

Other countries in Americas

All countries and verification levels

Last updated 2026-11-14. An independent service run by HALPII S.A.C. (Lima, Peru), not affiliated with or endorsed by any Paraguay authority.