nasa.donki_cme

beta Advanced

Coronal mass ejections (DONKI) in a date window (max 30 days).

GET /v1/nasa/donki_cme

What you get#

A list of Nasa 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
`start`	string	yes	(required)	Date YYYY-MM-DD	max 10 chars; must match `\d{4}-\d{2}-\d{2}`; trimmed
`end`	string	yes	(required)	Date YYYY-MM-DD	max 10 chars; must match `\d{4}-\d{2}-\d{2}`; trimmed

Request#

curl "https://api.onekey.dev/v1/nasa/donki_cme?start=2024-01-01&end=2024-01-10" \
  -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": [
    {
      "entity": {
        "id": "2024-01-01T17:00:00-CME-001",
        "date": "2024-01-01T17:00:00Z",
        "description": "Faint CME where the source is likely the minor movement of field lines behind the limb in SE in AIA 171 starting around 2024-01-01T16:30Z. Fully covered by data gap in STEREO A.",
        "category": "M2M_CATALOG",
        "url": "https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/CME/28435/-1"
      },
      "ext": {
        "sourceLocation": "",
        "activeRegion": null
      }
    },
    {
      "entity": {
        "id": "2024-01-02T11:09:00-CME-001",
        "date": "2024-01-02T11:09:00Z",
        "description": "The source of this wide CME is likely a very faint opening of field lines behind the SW limb seen in AIA 171 only after 2024-01-02T10:54Z.",
        "category": "M2M_CATALOG",
        "url": "https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/CME/28440/-1"
      },
      "ext": {
        "sourceLocation": "",
        "activeRegion": null
      }
    }
  ],
  "metadata": {
    "platform": "nasa",
    "endpoint": "donki_cme",
    "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. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`activityID`	`entity.id`	-
`startTime`	`entity.date`	`toIsoDate`
`sourceLocation`	`ext.sourceLocation`	-
`note`	`entity.description`	-
`catalog`	`entity.category`	-
`link`	`entity.url`	`safeUrl`
`activeRegionNum`	`ext.activeRegion`	`toNumber`

Caching and freshness#

Fresh for about 1 hour. Repeat calls in that window are served from cache and are free.
Between 1 hour and 1 day 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`	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 for the full list and retry guidance.

Status: beta (not yet verified against the live source).