europepmc.article

stable Standard

Europe PMC article (PubMed record) with abstract.

GET /v1/europepmc/article

What you get#

One Europepmc 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
`pmid`	string	yes	(required)	PubMed id (PMID)	max 9 chars; must match `[0-9]{1,9}`; trimmed

Request#

curl "https://api.onekey.dev/v1/europepmc/article?pmid=33087721" \
  -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 Europepmc response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "content": {
      "id": "33087721",
      "title": "Antibody-mediated disruption of the SARS-CoV-2 spike glycoprotein.",
      "text": "The CR3022 antibody, selected from a group of SARS-CoV monoclonal antibodies for its ability to cross-react with SARS-CoV-2, has been examined for its ability to bind to the ectodomain of the SARS-CoV-2 spike glycoprotein. Using cryo-electron microscopy we show that antibody binding requires rearrangements in the S1 domain that result in dissociation of the spike.",
      "year": 2020
    },
    "author": {
      "displayName": "Wrobel AG, Benton DJ, Hussain S, Harvey R, Martin SR, Roustan C, Rosenthal PB, Skehel JJ, Gamblin SJ."
    },
    "paper": {
      "journal": "Nature communications",
      "doi": "10.1038/s41467-020-19146-5"
    },
    "engagement": {
      "citations": 59
    }
  },
  "metadata": {
    "platform": "europepmc",
    "endpoint": "article",
    "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
`id`	`content.id`	-
`title`	`content.title`	-
`abstractText`	`content.text`	`stripHtml`
`authorString`	`author.displayName`	-
`journalInfo.journal.title`	`paper.journal`	-
`pubYear`	`content.year`	`toNumber`
`doi`	`paper.doi`	-
`citedByCount`	`engagement.citations`	`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 3 days 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).