# NASA Exoplanets on Onekey

> 2 endpoints for NASA Exoplanets (2 stable, 0 beta), 5 credits each. Category: Maps, weather & space. 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/exoplanets
Reference (Markdown): https://onekey.dev/docs/api/exoplanets.md
All docs: https://onekey.dev/llms.txt

## Canonical fields returned

Unified-schema fields (same names on every platform), with how many of the 2 mapped NASA Exoplanets endpoints return each:

- `entity.name` (string): 2
- plus 5 platform-specific fields under `ext.`

## Endpoints

### exoplanets.by_name

Confirmed exoplanet by name (NASA Exoplanet Archive).
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/exoplanets/by_name?name=Kepler-22%20b` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `name` (string, required): Planet name, e.g. Kepler-22 b
- Fields returned: `entity.name`, `ext.host`, `ext.discoveryYear`, `ext.method`, `ext.orbitalPeriodDays`, `ext.radiusEarth`
- Reference: https://onekey.dev/docs/api/exoplanets/by_name.md

### exoplanets.by_year

Confirmed exoplanets discovered in a year (NASA Exoplanet Archive).
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/exoplanets/by_year?year=2024` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `year` (string, required): Discovery year
- Fields returned: `entity.name`, `ext.host`, `ext.discoveryYear`, `ext.method`, `ext.orbitalPeriodDays`, `ext.radiusEarth`
- Reference: https://onekey.dev/docs/api/exoplanets/by_year.md

## Sample request

```bash
curl "https://api.onekey.dev/v1/exoplanets/by_name?name=Kepler-22%20b" \
  -H "x-api-key: YOUR_API_KEY"
```