# stackexchange.linked

**stable** **Advanced**

Questions that link to a question.

`GET /v1/stackexchange/linked`

## What you get

A list of Stack Exchange results in Onekey's unified shape, in `data` (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free `404 not_found` instead.

## What it costs

- **Advanced · 5 credits** 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 |
| --- | --- | --- | --- | --- | --- |
| `id` | string | yes | (required) | Question id | max 10 chars; must match `[0-9]{1,10}`; trimmed |
| `site` | string | no | - | Stack Exchange site, default stackoverflow | max 41 chars; must match `[a-z][a-z.]{1,40}`; trimmed, lowercased |

## Request

```bash
curl "https://api.onekey.dev/v1/stackexchange/linked?id=11227809" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/stackexchange/linked",
    params={"id": "11227809"},
    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({ id: "11227809" });
const res = await fetch(`https://api.onekey.dev/v1/stackexchange/linked?${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 Stack Exchange response, recorded and returned in Onekey's shape. Fields the platform does not provide are `null`.

```json
{
  "success": true,
  "data": [
    {
      "content": {
        "id": "61419699",
        "title": "Why does sorting make this branchless code faster?",
        "url": "https://stackoverflow.com/questions/61419699/why-does-sorting-make-this-branchless-code-faster",
        "text": null,
        "createdAt": "2020-04-25T00:58:27Z"
      },
      "entity": {
        "name": "c++"
      },
      "engagement": {
        "likes": 5,
        "comments": 2,
        "views": 626
      },
      "author": {
        "id": "12936536",
        "username": "Eric Stotch",
        "url": "https://stackoverflow.com/users/12936536/eric-stotch",
        "avatarUrl": "https://www.gravatar.com/avatar/5510c0d284618c1b3d412086ef6e278a?s=256&d=identicon&r=PG&f=y&so-version=2",
        "reputation": 289
      }
    },
    {
      "content": {
        "id": "30367035",
        "title": "Comparing a vector with an array assuming the elements are in different order",
        "url": "https://stackoverflow.com/questions/30367035/comparing-a-vector-with-an-array-assuming-the-elements-are-in-different-order",
        "text": null,
        "createdAt": "2015-05-21T07:19:46Z"
      },
      "entity": {
        "name": "c++"
      },
      "engagement": {
        "likes": 0,
        "comments": 1,
        "views": 349
      },
      "author": {
        "id": "4502680",
        "username": "Dekoderer Dekoderer",
        "url": "https://stackoverflow.com/users/4502680/dekoderer-dekoderer",
        "avatarUrl": "https://www.gravatar.com/avatar/21776783069b78dc41addf7e45997a0a?s=256&d=identicon&r=PG&f=y&so-version=2",
        "reputation": 171
      }
    }
  ],
  "metadata": {
    "platform": "stackexchange",
    "endpoint": "linked",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "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 |
| --- | --- | --- |
| `question_id` | `content.id` | `toString` |
| `title` | `content.title` | `htmlUnescape` |
| `link` | `content.url` | `safeUrl` |
| `body` | `content.text` | `stripHtml` |
| `creation_date` | `content.createdAt` | `toIsoDate` |
| `tags.0` | `entity.name` | - |
| `score` | `engagement.likes` | `toNumber` |
| `answer_count` | `engagement.comments` | `toNumber` |
| `view_count` | `engagement.views` | `toNumber` |
| `owner.user_id` | `author.id` | `toString` |
| `owner.display_name` | `author.username` | `htmlUnescape` |
| `owner.link` | `author.url` | `safeUrl` |
| `owner.profile_image` | `author.avatarUrl` | `safeUrl` |
| `owner.reputation` | `author.reputation` | `toNumber` |

## Caching and freshness

- Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
- Between 2 minutes and 15 minutes 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 1 hour more (marked stale).
- A "not found" is remembered for 1 minute 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` | Unknown endpoint path. |
| 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).