nasa.apod

stable Standard

Astronomy Picture of the Day (today).

GET /v1/nasa/apod

What you get#

One Nasa 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#

This endpoint takes no parameters.

Request#

curl "https://api.onekey.dev/v1/nasa/apod" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

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

json

{
  "success": true,
  "data": {
    "content": {
      "title": "Cosmic Latte: The Average Color of the Universe",
      "text": "What color is the universe?  More precisely, if the entire sky were smeared out, what color would the final mix be?  This whimsical question came up when trying to determine what stars are commonplace in nearby galaxies. The answer, depicted here, is a conditionally perceived shade of beige. In computer parlance: #FFF8E7.  To determine this, astronomers computationally averaged the light emitted b",
      "createdAt": "2026-09-28T00:00:00Z"
    },
    "media": {
      "url": "https://apod.nasa.gov/apod/image/2609/CosmicLatte_jhu_960_annotated.jpg",
      "thumbnailUrl": null
    },
    "entity": {
      "url": "https://apod.nasa.gov/apod/image/2609/CosmicLatte_jhu_960.jpg",
      "category": "image"
    },
    "author": {
      "displayName": null
    }
  },
  "metadata": {
    "platform": "nasa",
    "endpoint": "apod",
    "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. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`title`	`content.title`	-
`explanation`	`content.text`	-
`url`	`media.url`	`safeUrl`
`hdurl`	`entity.url`	`safeUrl`
`media_type`	`entity.category`	-
`date`	`content.createdAt`	`toIsoDate`
`copyright`	`author.displayName`	-
`thumbnail_url`	`media.thumbnailUrl`	`safeUrl`

Caching and freshness#

Fresh for about 30 minutes. Repeat calls in that window are served from cache and are free.
Between 30 minutes and 6 hours 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 day 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; 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 for the full list and retry guidance.

Status: stable (verified against the live source).