nws.observation_latest

stable Standard

Latest observation at a station (temperature, wind, pressure, humidity).

GET /v1/nws/observation_latest

What you get#

One Nws 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#

Name	Type	Required	Default	What it is	Constraints
`station`	string	yes	(required)	Station id, UPPERCASE (e.g. KTOP)	max 6 chars; must match `[A-Z0-9]{3,6}`; trimmed

Request#

curl "https://api.onekey.dev/v1/nws/observation_latest?station=KTOP" \
  -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 Nws response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "entity": {
      "id": "KTOP",
      "name": "Topeka, Philip Billard Municipal Airport",
      "category": "Clear",
      "date": "2026-09-28T20:05:00Z"
    },
    "ext": {
      "temperatureC": 26,
      "dewpointC": 17,
      "windSpeedKmH": 14.832,
      "windDirectionDeg": 110,
      "pressurePa": 101557.8,
      "humidityPct": 57.634332679046,
      "visibilityM": 16093.44
    }
  },
  "metadata": {
    "platform": "nws",
    "endpoint": "observation_latest",
    "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
`stationId`	`entity.id`	-
`stationName`	`entity.name`	-
`textDescription`	`entity.category`	-
`timestamp`	`entity.date`	`toIsoDate`
`temperature.value`	`ext.temperatureC`	`toNumber`
`dewpoint.value`	`ext.dewpointC`	`toNumber`
`windSpeed.value`	`ext.windSpeedKmH`	`toNumber`
`windDirection.value`	`ext.windDirectionDeg`	`toNumber`
`barometricPressure.value`	`ext.pressurePa`	`toNumber`
`relativeHumidity.value`	`ext.humidityPct`	`toNumber`
`visibility.value`	`ext.visibilityM`	`toNumber`

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 1 hour 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; 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).