crossref.work

stable Standard

Crossref work by DOI.

GET /v1/crossref/work

What you get#

One Crossref 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
`doi`	string	yes	(required)	DOI, e.g. 10.1037/0003-066X.59.1.29	max 170 chars; must match `10\.[0-9]{4,9}/[^\s\x00-\x1f\x7f]{1,150}`; trimmed

Request#

curl "https://api.onekey.dev/v1/crossref/work?doi=10.1037%2F0003-066X.59.1.29" \
  -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 Crossref response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "content": {
      "id": "10.1037/0003-066x.59.1.29",
      "title": "How the Mind Hurts and Heals the Body.",
      "type": "journal-article",
      "year": 2004,
      "url": "https://doi.org/10.1037/0003-066x.59.1.29"
    },
    "paper": {
      "publisher": "American Psychological Association (APA)",
      "journal": "American Psychologist"
    },
    "engagement": {
      "citations": 113
    },
    "author": {
      "displayName": "Ray"
    }
  },
  "metadata": {
    "platform": "crossref",
    "endpoint": "work",
    "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
`DOI`	`content.id`	-
`title.0`	`content.title`	-
`type`	`content.type`	-
`publisher`	`paper.publisher`	-
`container-title.0`	`paper.journal`	-
`issued.date-parts.0.0`	`content.year`	`toNumber`
`URL`	`content.url`	`safeUrl`
`is-referenced-by-count`	`engagement.citations`	`toNumber`
`author.0.family`	`author.displayName`	-

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).