semanticscholar.citations

stable Advanced

Papers citing a Semantic Scholar paper.

GET /v1/semanticscholar/citations

What you get#

A list of Semanticscholar 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
`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/citations?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": "e0b3f67337057f349c301a85ee426a291c30d57a",
        "title": "Layout-Guided Masking for GROBID: Lightweight Structural Gains in Large-Scale Scientific PDF Ingestion",
        "year": 2026,
        "url": "https://www.semanticscholar.org/paper/e0b3f67337057f349c301a85ee426a291c30d57a"
      },
      "engagement": {
        "citations": 0
      }
    },
    {
      "content": {
        "id": "ac310dd8a7c89237c47bd55dedf232e23c1893a5",
        "title": "CABAL: Multi-Agent Simulacra for Tracing the Effects of Collusive Bidding in Peer Review",
        "year": 2026,
        "url": "https://www.semanticscholar.org/paper/ac310dd8a7c89237c47bd55dedf232e23c1893a5"
      },
      "engagement": {
        "citations": 1
      }
    }
  ],
  "metadata": {
    "platform": "semanticscholar",
    "endpoint": "citations",
    "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
`citingPaper.paperId`	`content.id`	-
`citingPaper.title`	`content.title`	-
`citingPaper.year`	`content.year`	`toNumber`
`citingPaper.url`	`content.url`	`safeUrl`
`citingPaper.citationCount`	`engagement.citations`	`toNumber`

Caching and freshness#

Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
Between 2 minutes and 15 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`	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: stable (verified against the live source).