# wikipedia.extract

**stable** **Standard**

Plain-text intro extract of a Wikipedia article (follows redirects).

`GET /v1/wikipedia/extract`

## What you get

One Wikipedia record in Onekey's unified shape, in `data`. If the record does not exist you get a `404 not_found` and are not charged.

## What it costs

- **Standard · 1 credit** for a fresh fetch, charged only when it succeeds.
- **Free when served from cache (0.2 credit for a cached response over 100 KB).**
- **Free** if the request is invalid (never charged) or the source fails or reports not found (refunded).

## Parameters

| Name | Type | Required | Default | What it is | Constraints |
| --- | --- | --- | --- | --- | --- |
| `title` | string | yes | (required) | Page title | max 200 chars; must match `[^\x00-\x1f\x7f\|/]{1,200}`; trimmed, repeated spaces collapsed |

## Request

```bash
curl "https://api.onekey.dev/v1/wikipedia/extract?title=Alan%20Turing" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/wikipedia/extract",
    params={"title": "Alan Turing"},
    headers={"x-api-key": "YOUR_API_KEY"},
)
body = res.json()

if body["success"]:
    print(body["data"])
else:
    print(body["error"]["code"], body["error"]["message"])
```

```javascript
const params = new URLSearchParams({ title: "Alan Turing" });
const res = await fetch(`https://api.onekey.dev/v1/wikipedia/extract?${params}`, {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const body = await res.json();

if (body.success) console.log(body.data);
else console.error(body.error.code, body.error.message);
```

## Recorded response

A real Wikipedia response, recorded and returned in Onekey's shape. Fields the platform does not provide are `null`.

```json
{
  "success": true,
  "data": {
    "content": {
      "id": "1208",
      "title": "Alan Turing",
      "text": "Alan Mathison Turing (; 23 June 1912 – 7 June 1954) was an English mathematician and logician widely regarded as the father of theoretical computer science. He formalised the concepts of algorithm and computation with the Turing machine, a model of a general-purpose computer, and his contributions to cryptanalysis helped the Allies of World War II deciper messages encrypted by the German Enigma machine. He also contributed the Turing test to philosophy of artificial intelligence and the Turing p"
    }
  },
  "metadata": {
    "platform": "wikipedia",
    "endpoint": "extract",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 1,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}
```

## Field mapping

How this endpoint's source fields become Onekey's [unified schema](https://onekey.dev/docs/schema.md). Fields the source lacks come back as `null`.

| Source path | Onekey field | Transform |
| --- | --- | --- |
| `pageid` | `content.id` | `toString` |
| `title` | `content.title` | - |
| `extract` | `content.text` | - |

## Caching and freshness

- Fresh for about 1 hour. Repeat calls in that window are served from cache and are free.
- Between 1 hour and 1 day the cached copy is still served instantly and marked `stale: true` while Onekey refreshes it in the background.
- If the source is down when a refresh is needed, the last copy can be served for up to 3 days more (marked stale).
- A "not found" is remembered for 5 minutes and is free.
- The cache is shared across all customers, which is what keeps repeat calls cheap.

## What can go wrong

| Status | Code | What to do |
| --- | --- | --- |
| 401 | `unauthorized` | Check the `x-api-key` header. |
| 402 | `insufficient_credits` | [Add credits](https://onekey.dev/pricing); your balance must cover the price. |
| 404 | `not_found` | That record does not exist. Free; do not retry. |
| 422 | `invalid_params` | Fix the parameters using the table above. Free. |
| 429 | `rate_limited` | Wait `Retry-After` seconds, then retry. |
| 502 | `upstream_error` | The source failed. Refunded; retry with backoff. |

See [Errors](https://onekey.dev/docs/errors.md) for the full list and retry guidance.

Status: stable (verified against the live source).