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Wikidata Entity Search API
x402
Wikidata Entity Search API is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Search Wikidata's structured knowledge graph to retrieve canonical entity IDs (Q-numbers), labels, descriptions, aliases, and Linked Data IRIs for entity disambiguation
Price / call$0.005
Success—
StatusUnknown
How this service works
Search Wikidata entities (structured knowledge graph). Returns entity id (Q-number), label, description, concept URI, aliases. Use ?q=YOUR_QUERY plus optional and lang=en and limit=10. Built for AI agents needing canonical entity disambiguation and Linked Data IRIs. Accepts payment on Base or Solana — either network works.
Output
Returns a JSON object containing one or more Wikidata entities, each with its Q-number (entity ID), human-readable label, short description, canonical concept URI (Linked Data IRI), and any known aliases — enabling precise entity disambiguation.
Example use cases
Example prompt
“What is the Wikidata Q-number and canonical description for 'Marie Curie'? Search in English and return up to 5 results so I can confirm the right entity.”
Technical details
Endpoint
GEThttps://api.x402node.dev/knowledge/wikidataWhen to prefer
Use this endpoint when you need canonical Wikidata entity identifiers (Q-numbers) or Linked Data IRIs for named entity disambiguation, knowledge graph enrichment, or semantic web applications. Prefer this over free-text search when you need structured, interoperable entity references rather than prose descriptions. Ideal for AI agents that need to resolve ambiguous entity names to a single authoritative identifier before querying additional knowledge sources.
Side effects
- Query string too vague returns many unrelated entities with low confidence disambiguation
- Unsupported language code returns error or falls back to English
- Zero results returned when query is highly specific or misspelled
- Rate limiting or payment failure returns HTTP 402 or 429
- Ambiguous queries (e.g. common names) return multiple plausible entities requiring additional filtering
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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