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Wikidata Facts – Identifier Lookup
x402
Wikidata Facts – Identifier Lookup is a paid API for AI agents from wikidata-facts.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-21).
Looks up the Wikidata entity matching a given identifier (ISBN, ORCID, IMDb ID, ISO code, VIAF, GeoNames ID, or DOI) with check-digit validation.
Price / call$0.03
Success—
StatusUnknown
How this service works
Find the Wikidata entity for an ISBN, ORCID, IMDb id, ISO code, VIAF, GeoNames id or DOI, with check-digit validation.
Output
Returns the matched Wikidata entity or entities (Q-id, label, description, URL), validation status of the identifier including check-digit result, the normalised form of the identifier, any reasons for validation failure, and source attribution with an as-of timestamp.
Example use cases
Book metadata enrichment by ISBN
“I have the ISBN 9780141439518 — can you find its Wikidata entity and confirm the ISBN is valid?”
Resolve author ORCID to Wikidata
“Can you find the Wikidata entry for the researcher with ORCID 0000-0001-5109-3700 and tell me their Q-id?”
Look up country entity by ISO code
“What's the Wikidata entity for the country with ISO alpha-2 code 'FR'? I need the Q-id and description.”
Technical details
Endpoint
GEThttps://wikidata-facts.x402tookit.com/identifier-lookup?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have a structured external identifier (ISBN, ORCID, IMDb, ISO code, VIAF, GeoNames, DOI) and need to resolve it to a Wikidata entity with validation. Prefer this over general Wikidata search when the identifier is known, as it provides check-digit validation and a precise 1-to-1 match rather than a fuzzy name search.
Side effects
- Invalid check digit causes validation failure with reasons array populated
- Identifier not found in Wikidata returns empty matches array
- Unsupported identifier type returns an error
- Malformed identifier value (wrong format) causes rejection
- Wikidata service temporarily unavailable may return degraded flag set to true
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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