# Encyclopedia Entry Lookup

> Encyclopedia Entry Lookup is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Looks up a Wikipedia article by title and returns structured JSON with the title, short description, lead summary, thumbnail image, and canonical URL.

## Facts

- Endpoint: POST https://x402.forgemesh.io/encyclopedia-entry-lookup
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/encyclopedia-entry-lookup-1d8ce2f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7anW_UgVnT1_wHboDPAbz

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 encyclopedia-entry-lookup-1d8ce2f2 -d '<json body>'
```

Example prompt: Pull up the Wikipedia entry for Alan Turing — I need the title, a short description, the lead summary paragraph, thumbnail image, and the canonical article URL as structured data.

## When to prefer this

Prefer this endpoint when you need a grounded, factual summary of a named entity, concept, or topic and want structured JSON output (title, description, lead paragraph, thumbnail, URL) rather than a free-form generation. Ideal for entity enrichment pipelines, fact-checking agents, and research assistants that need Wikipedia-sourced summaries without hallucination risk.

## Known failure modes

- Article not found for the given title — returns empty or error response
- Ambiguous title matching wrong article — agent should try a more specific title
- Wikipedia article has no thumbnail — thumbnail field may be null
- Rate limit or payment failure — 402 payment required if USDC not provided
- Cached result may be up to 24 hours old for fast-changing topics

## How this service works

Look up any topic on the web's largest collaboratively-edited encyclopedia and get back the title, short description, lead summary paragraph, thumbnail image, and canonical article URL as structured JSON. For entity enrichment, fact-checking, and research agents that need a grounded summary instead of a hallucinated one. Cached 24 hours, attribution included.

## Output

Structured JSON containing the Wikipedia article title, a short description, the full lead summary paragraph, a thumbnail image URL, and the canonical Wikipedia article URL. Results are cached for 24 hours and include attribution.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "title": {
   "type": "string",
   "description": "Article title, e.g. Alan Turing"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "title": "Alan Turing",
   "extract": "Alan Mathison Turing was an English mathematician...",
   "description": "English computer scientist (1912–1954)"
  },
  "attribution": "Wikipedia, CC BY-SA 4.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/encyclopedia-entry-lookup-1d8ce2f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.forgemesh.io](https://www.zero.xyz/host/x402.forgemesh.io/llms.txt)