semanticscholar.paper

stable Standard

Semantic Scholar paper by id.

GET /v1/semanticscholar/paper

What you get#

One Semanticscholar 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
`id`	string	yes	(required)	Semantic Scholar paper id (40-hex, CorpusId:n, DOI:..., ARXIV:...)	max 150 chars; must match `(?:[0-9a-f]{40}\|CorpusId:[0-9]{1,12}\|DOI:10\.[0-9]{4,9}/[^\s\x00-\x1f\x7f]{1,120}\|ARXIV:[0-9]{4}\.[0-9]{4,5})`; trimmed

Request#

curl "https://api.onekey.dev/v1/semanticscholar/paper?id=649def34f8be52c8b66281af98ae884c09aef38b" \
  -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 Semanticscholar response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "content": {
      "id": "649def34f8be52c8b66281af98ae884c09aef38b",
      "title": "Construction of the Literature Graph in Semantic Scholar",
      "year": 2018,
      "url": "https://www.semanticscholar.org/paper/649def34f8be52c8b66281af98ae884c09aef38b",
      "text": "We describe a deployed scalable system for organizing published scientific literature into a heterogeneous graph to facilitate algorithmic manipulation and discovery. The resulting literature graph consists of more than 280M nodes, representing papers, authors, entities and various interactions between them (e.g., authorships, citations, entity mentions). We reduce literature graph construction into familiar NLP tasks (e.g., entity extraction and linking), point out research challenges due to di"
    },
    "paper": {
      "venue": "North American Chapter of the Association for Computational Linguistics"
    },
    "engagement": {
      "citations": 458
    }
  },
  "metadata": {
    "platform": "semanticscholar",
    "endpoint": "paper",
    "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
`paperId`	`content.id`	-
`title`	`content.title`	-
`year`	`content.year`	`toNumber`
`url`	`content.url`	`safeUrl`
`venue`	`paper.venue`	-
`citationCount`	`engagement.citations`	`toNumber`
`abstract`	`content.text`	-

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).