# Wikidata Facts – Property Value Lookup

> Wikidata Facts – Property Value Lookup is a paid API for AI agents from wikidata-facts.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-21).

Returns all values of a specific Wikidata property on a given entity, including ranks, timestamps, and units.

## Facts

- Endpoint: GET https://wikidata-facts.x402tookit.com/property-value?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wikidata-facts-property-value-lookup-2d01c2cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RHqe8k2lulGaOHfR2wwRm

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-facts-property-value-lookup-2d01c2cb
```

Example prompt: What does Wikidata say about the population of Paris? Fetch all values of property P1082 for the entity Q90.

## When to prefer this

Use this endpoint when you need structured, ranked, time-stamped values for a specific Wikidata property on a known entity — especially when you want historical series (e.g. multiple population records), unit metadata, or need to distinguish preferred vs deprecated values. Prefer this over a general entity profile endpoint when you only need one specific property rather than a full profile.

## Known failure modes

- Entity not found if Q-id is invalid or name is ambiguous without a hint
- Property not found on entity returns empty values array
- Name disambiguation failure returns alternatives list instead of values
- Network or Wikidata API timeout results in degraded or partial response
- Invalid property id format returns an error

## How this service works

All values of one Wikidata property (for example P1082 population) on an entity, with ranks and dates.

## Output

A structured response including the entity label, the requested property, an array of all matching values each with its rank (preferred/normal/deprecated), point-in-time date, numeric amount, and unit label; plus a 'best' value summarizing the top-ranked entry, a human-readable summary, and attribution/source metadata.

## 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": [
      "id",
      "property"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "Wikidata Q-id or a name, e.g. Q90 or Paris"
      },
      "hint": {
       "type": "string",
       "description": "Optional words to disambiguate a name"
      },
      "property": {
       "type": "string",
       "description": "Wikidata property id, e.g. P1082 (population) or P36 (capital)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "url": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "best": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "kind": {
         "type": [
          "null",
          "string"
         ]
        },
        "unit": {},
        "lower": {},
        "upper": {},
        "amount": {
         "type": [
          "null",
          "number"
         ]
        },
        "unitLabel": {
         "type": [
          "null",
          "string"
         ]
        },
        "pointInTime": {
         "type": [
          "null",
          "string"
         ]
        }
       }
      },
      "count": {
       "type": [
        "null",
        "number"
       ]
      },
      "label": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "values": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "rank": {
          "type": [
           "null",
           "string"
          ]
         },
         "value": {
          "type": [
           "null",
           "object"
          ],
          "properties": {
           "kind": {
     
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wikidata-facts-property-value-lookup-2d01c2cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wikidata-facts.x402tookit.com](https://www.zero.xyz/host/wikidata-facts.x402tookit.com/llms.txt)