# Wikidata Entity Search

> Wikidata Entity Search is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Searches the Wikidata knowledge base for entities (people, companies, places) by label and returns matching entity data as JSON.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/wikidata-entity-search
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wikidata-entity-search-44b967ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j0Equd9Zs-Jci6Ds9MRmL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability wikidata-entity-search-44b967ac -d '<json body>'
```

Example prompt: Can you search Wikidata for the entity matching 'Marie Curie' and give me the structured knowledge-base results including her entity ID and description?

## When to prefer this

Use this endpoint when you need to resolve a real-world name (person, organization, or place) to a structured Wikidata entity with a Q-identifier, especially for knowledge-graph enrichment, entity linking, or fact-checking tasks. Prefer this over general web search when you need canonical, structured, machine-readable entity data from the Wikidata knowledge base.

## Known failure modes

- No matching entities found for the given label — returns empty results or 404
- Ambiguous label returns multiple entities requiring further disambiguation
- Wikidata service temporarily unavailable — upstream timeout or 503
- Malformed or missing query parameter returns error response
- Non-English labels may return fewer or no results depending on Wikidata coverage

## How this service works

Wikidata knowledge-base entity search (people, companies, places) by label (q) Query: ?q= Returns JSON.

## Output

A JSON array or object of Wikidata entities matching the query label, including entity IDs (Q-numbers), labels, descriptions, and entity types for people, companies, or places.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wikidata-entity-search-44b967ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)