# 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

```bash
curl "https://api.onekey.dev/v1/semanticscholar/paper?id=649def34f8be52c8b66281af98ae884c09aef38b" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/semanticscholar/paper",
    params={"id": "649def34f8be52c8b66281af98ae884c09aef38b"},
    headers={"x-api-key": "YOUR_API_KEY"},
)
body = res.json()

if body["success"]:
    print(body["data"])
else:
    print(body["error"]["code"], body["error"]["message"])
```

```javascript
const params = new URLSearchParams({ id: "649def34f8be52c8b66281af98ae884c09aef38b" });
const res = await fetch(`https://api.onekey.dev/v1/semanticscholar/paper?${params}`, {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const body = await res.json();

if (body.success) console.log(body.data);
else console.error(body.error.code, body.error.message);
```

## 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](https://onekey.dev/docs/schema.md). 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](https://onekey.dev/pricing); 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](https://onekey.dev/docs/errors.md) for the full list and retry guidance.

Status: stable (verified against the live source).