# AgentRXI Facts – Wikipedia & Wikidata Lookup

> AgentRXI Facts – Wikipedia & Wikidata Lookup is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-15).

Returns the best-matching Wikipedia article summary plus structured Wikidata facts (website, founding date, birth/death dates, population, coordinates) and source link for any topic, person, place, or thing.

## Facts

- Endpoint: GET https://agentrxi.com/v1/facts?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-facts-wikipedia-wikidata-lookup-27704818
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RKuQzBbbtQOM7fFgIpq6D

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 agentrxi-facts-wikipedia-wikidata-lookup-27704818
```

Example prompt: What are the key facts about Marie Curie — her birth date, death date, and a quick summary of who she was?

## When to prefer this

Choose this endpoint when you need reliable, encyclopedic factual grounding about well-known entities — people, places, organizations, or concepts — especially when structured fields like founding dates, population, coordinates, or birth/death dates are needed alongside a narrative summary. Prefer it over general web search when you want structured Wikidata fields in addition to prose, or when you need multilingual Wikipedia coverage.

## Known failure modes

- No matching Wikipedia article found for the query — returns empty or null result
- Ambiguous query resolves to an unexpected article — agent should refine the query
- Wikidata fields may be partially missing if the entity lacks structured data
- Unsupported or invalid language code returns an error or falls back to English
- Rate limiting or payment failure returns a 402 or 429 error

## How this service works

Fact lookup for grounding: best-matching Wikipedia article summary plus structured Wikidata facts (website, founding date, birth/death dates, population, coordinates) and the source link. Any language edition.

## Output

Returns a JSON object containing the best-matching Wikipedia article summary (a few paragraphs), structured Wikidata fields (website, founding date, birth date, death date, population, geographic coordinates), and a source link to the Wikipedia article. Any Wikipedia language edition is supported.

## Request schema (JSON Schema)

```json
{
 "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": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Topic, person, place or thing"
      },
      "lang": {
       "type": "string",
       "description": "Wikipedia language code, default en"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentrxi-facts-wikipedia-wikidata-lookup-27704818/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)