# AtCoder on Onekey

> 4 endpoints for AtCoder (4 stable, 0 beta), 1 to 5 credits each. Category: Developer platforms. One key, one JSON shape.

Base URL: https://api.onekey.dev
Auth: header `x-api-key: <key>`. Call shape: `GET /v1/{platform}/{endpoint}?{params}`.
Every response is `{success, data, metadata, error}`; check `success` first. Cost is in `metadata.credits_charged`. Free when served from cache (0.2 credit for a cached response over 100 KB). Failed and not-found calls are refunded.
Status: stable = verified against the live source; beta = not yet verified, fields may be missing.

Page: https://onekey.dev/platforms/atcoder
Reference (Markdown): https://onekey.dev/docs/api/atcoder.md
All docs: https://onekey.dev/llms.txt

## Canonical fields returned

Unified-schema fields (same names on every platform), with how many of the 4 mapped AtCoder endpoints return each:

- `content.createdAt` (ISO 8601 date): 2
- `content.title` (string): 2
- `entity.id` (string): 2
- `entity.stats.rank` (integer): 2
- `media.durationSeconds` (number): 1
- plus 8 platform-specific fields under `ext.`

## Endpoints

### atcoder.ac_rank

An AtCoder user's accepted-problem count and rank (kenkoooo).
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/atcoder/ac_rank?user=chokudai` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `user` (string, required): AtCoder user id, e.g. chokudai
- Fields returned: `entity.stats.rank`, `ext.solved`
- Reference: https://onekey.dev/docs/api/atcoder/ac_rank.md

### atcoder.contest_history

An AtCoder user's rated contest history.
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/atcoder/contest_history?user=chokudai` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `user` (string, required): AtCoder user id, e.g. chokudai
- Fields returned: `content.title`, `entity.id`, `content.createdAt`, `ext.newRating`, `ext.oldRating`, `ext.place`, `ext.performance`, `ext.rated`
- Reference: https://onekey.dev/docs/api/atcoder/contest_history.md

### atcoder.contests

All AtCoder contests (kenkoooo problem archive).
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/atcoder/contests` with header `x-api-key: YOUR_API_KEY`
- Parameters: none
- Fields returned: `entity.id`, `content.title`, `content.createdAt`, `media.durationSeconds`, `ext.rateChange`
- Reference: https://onekey.dev/docs/api/atcoder/contests.md

### atcoder.rated_point_sum

An AtCoder user's rated-point-sum and rank (kenkoooo).
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/atcoder/rated_point_sum?user=chokudai` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `user` (string, required): AtCoder user id, e.g. chokudai
- Fields returned: `entity.stats.rank`, `ext.ratedPointSum`
- Reference: https://onekey.dev/docs/api/atcoder/rated_point_sum.md

## Sample request

```bash
curl "https://api.onekey.dev/v1/atcoder/ac_rank?user=chokudai" \
  -H "x-api-key: YOUR_API_KEY"
```