# kitsu.trending_anime

**stable** **Advanced**

Trending anime on Kitsu.

`GET /v1/kitsu/trending_anime`

## What you get

A list of Kitsu 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

This endpoint takes no parameters.

## Request

```bash
curl "https://api.onekey.dev/v1/kitsu/trending_anime" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

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

```json
{
  "success": true,
  "data": [
    {
      "entity": {
        "id": "7442",
        "name": "Attack on Titan",
        "description": "Centuries ago, mankind was slaughtered to near extinction by monstrous humanoid creatures called titans, forcing humans to hide in fear behind enormous concentric walls. What makes these giants truly terrifying is that their taste for human flesh is not born out of hunger but what appears to be out of pleasure. To ensure their survival, the remnants of humanity began living within defensive barriers, resulting in one hundred years without a single titan encounter. However, that fragile calm is s",
        "status": "finished",
        "type": "TV",
        "stats": {
          "score": 84.42
        }
      },
      "event": {
        "startDate": "2013-04-07"
      },
      "ext": {
        "episodes": 25,
        "popularityRank": 1
      },
      "media": {
        "thumbnailUrl": "https://media.kitsu.app/anime/poster_images/7442/small.jpg"
      }
    },
    {
      "entity": {
        "id": "11469",
        "name": "Boku no Hero Academia",
        "description": "What would the world be like if 80 percent of the population manifested extraordinary superpowers called “Quirks” at age four? Heroes and villains would be battling it out everywhere! Becoming a hero would mean learning to use your power, but where would you go to study? U.A. High's Hero Program of course! But what would you do if you were one of the 20 percent who were born Quirkless?\n\nMiddle school student Izuku Midoriya wants to be a hero more than anything, but he hasn't got an ounce of powe",
        "status": "finished",
        "type": "TV",
        "stats": {
          "score": 83.07
        }
      },
      "event": {
        "startDate": "2016-04-03"
      },
      "ext": {
        "episodes": 13,
        "popularityRank": 2
      },
      "media": {
        "thumbnailUrl": "https://media.kitsu.app/anime/poster_images/11469/small.jpg"
      }
    }
  ],
  "metadata": {
    "platform": "kitsu",
    "endpoint": "trending_anime",
    "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 |
| --- | --- | --- |
| `id` | `entity.id` | - |
| `attributes.canonicalTitle` | `entity.name` | - |
| `attributes.synopsis` | `entity.description` | - |
| `attributes.status` | `entity.status` | - |
| `attributes.subtype` | `entity.type` | - |
| `attributes.startDate` | `event.startDate` | - |
| `attributes.episodeCount` | `ext.episodes` | `toNumber` |
| `attributes.averageRating` | `entity.stats.score` | `toNumber` |
| `attributes.popularityRank` | `ext.popularityRank` | `toNumber` |
| `attributes.posterImage.small` | `media.thumbnailUrl` | `safeUrl` |

## Caching and freshness

- Fresh for about 30 seconds. Repeat calls in that window are served from cache and are free.
- Between 30 seconds and 5 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 10 minutes 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).