{"uid":"cap_h7fSF00tt3-tdNOyQbis-","slug":"wikidata-facts-identifier-lookup-a4e5852e","name":"Wikidata Facts – Identifier Lookup","description":"Find the Wikidata entity for an ISBN, ORCID, IMDb id, ISO code, VIAF, GeoNames id or DOI, with check-digit validation.","url":"https://wikidata-facts.x402tookit.com/identifier-lookup?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["type","value"],"properties":{"type":{"type":"string","description":"One of: isbn, orcid, imdb, iso-alpha2, iso-alpha3, iso-numeric, iso-4217, iso-639-1, viaf, geonames, doi"},"value":{"type":"string","description":"The identifier, e.g. 9780141439518 or FR or nm0000093"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"type":{"type":["null","string"]},"valid":{"type":["boolean","null"]},"value":{"type":["null","string"]},"source":{"type":["null","string"]},"matches":{"type":["array","null"],"items":{"type":"object","properties":{"id":{"type":["null","string"]},"url":{"type":["null","string"]},"label":{"type":["null","string"]},"description":{"type":["null","string"]}}}},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"property":{"type":["null","string"]},"sourceUrl":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"normalised":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"attribution":{"type":["null","string"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_zHL3G264X4MR-_pauvECn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up the Wikidata entity matching a given identifier (ISBN, ORCID, IMDb ID, ISO code, VIAF, GeoNames ID, or DOI) with check-digit validation.","exampleAgentPrompt":"Can you look up the Wikidata entity for ISBN 9780141439518 and validate the check digit?","exampleUseCases":[{"title":"Book metadata enrichment by ISBN","prompt":"I have the ISBN 9780141439518 — can you find its Wikidata entity and confirm the ISBN is valid?"},{"title":"Resolve author ORCID to Wikidata","prompt":"Can you find the Wikidata entry for the researcher with ORCID 0000-0001-5109-3700 and tell me their Q-id?"},{"title":"Look up country entity by ISO code","prompt":"What's the Wikidata entity for the country with ISO alpha-2 code 'FR'? I need the Q-id and description."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:19:01.458Z","isFirstParty":false,"canonicalSlug":"wikidata-facts-identifier-lookup-a4e5852e"}