# Crossref on Onekey

> 10 endpoints for Crossref (10 stable, 0 beta), 1 to 5 credits each. Category: Science & research. One key, one JSON shape.

Base URL: https://api.onekey.dev
Auth: header `x-api-key: <key>`. Call shape: `GET /v1/{platform}/{endpoint}?{params}`.
Every response is `{success, data, metadata, error}`; check `success` first. Cost is in `metadata.credits_charged`. Free when served from cache (0.2 credit for a cached response over 100 KB). Failed and not-found calls are refunded.
Status: stable = verified against the live source; beta = not yet verified, fields may be missing.

Page: https://onekey.dev/platforms/crossref
Reference (Markdown): https://onekey.dev/docs/api/crossref.md
All docs: https://onekey.dev/llms.txt

## Canonical fields returned

Unified-schema fields (same names on every platform), with how many of the 10 mapped Crossref endpoints return each:

- `entity.name` (string): 7
- `entity.id` (string): 5
- `entity.location` (string): 4
- `paper.publisher` (string): 4
- `content.id` (string): 3
- `content.title` (string): 3
- `author.displayName` (string): 2
- `content.type` (string): 2
- `content.url` (URL): 2
- `content.year` (integer): 2
- `engagement.citations` (integer): 2
- `paper.issn` (string): 2
- `paper.journal` (string): 2
- plus 1 platform-specific field under `ext.`

## Endpoints

### crossref.funder

Crossref funder by funder id.
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/crossref/funder?id=100000001` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `id` (string, required): Funder id
- Fields returned: `entity.id`, `entity.name`, `entity.location`, `ext.works`
- Reference: https://onekey.dev/docs/api/crossref/funder.md

### crossref.funders_search

Search Crossref funders.
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/crossref/funders_search?q=national%20science%20foundation` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `q` (string, required): Search query
- Fields returned: `entity.id`, `entity.name`, `entity.location`
- Reference: https://onekey.dev/docs/api/crossref/funders_search.md

### crossref.journal

Crossref journal by ISSN.
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/crossref/journal?issn=0028-0836` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `issn` (string, required): ISSN, e.g. 0028-0836
- Fields returned: `entity.name`, `paper.publisher`, `paper.issn`, `ext.works`
- Reference: https://onekey.dev/docs/api/crossref/journal.md

### crossref.journals_search

Search Crossref journals.
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/crossref/journals_search?q=journal%20of%20the%20american%20chemical%20society` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `q` (string, required): Search query
- Fields returned: `entity.name`, `paper.publisher`, `paper.issn`, `ext.works`
- Reference: https://onekey.dev/docs/api/crossref/journals_search.md

### crossref.member

Crossref member by member id.
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/crossref/member?id=78` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `id` (string, required): Member id
- Fields returned: `entity.id`, `entity.name`, `entity.location`, `ext.works`
- Reference: https://onekey.dev/docs/api/crossref/member.md

### crossref.members_search

Search Crossref members (publishers).
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/crossref/members_search?q=elsevier` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `q` (string, required): Search query
- Fields returned: `entity.id`, `entity.name`, `entity.location`
- Reference: https://onekey.dev/docs/api/crossref/members_search.md

### crossref.prefix

Crossref DOI prefix owner.
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/crossref/prefix?prefix=10.1016` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `prefix` (string, required): DOI prefix, e.g. 10.1016
- Fields returned: `entity.id`, `entity.name`
- Reference: https://onekey.dev/docs/api/crossref/prefix.md

### crossref.types

Crossref work types.
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/crossref/types` with header `x-api-key: YOUR_API_KEY`
- Parameters: none
- Fields returned: `content.id`, `content.title`
- Reference: https://onekey.dev/docs/api/crossref/types.md

### crossref.work

Crossref work by DOI.
- Price: 1 credit per fresh call. Status: stable. Returns: one record.
- Request: `GET https://api.onekey.dev/v1/crossref/work?doi=10.1037%2F0003-066X.59.1.29` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `doi` (string, required): DOI, e.g. 10.1037/0003-066X.59.1.29
- Fields returned: `content.id`, `content.title`, `content.type`, `paper.publisher`, `paper.journal`, `content.year`, `content.url`, `engagement.citations`, `author.displayName`
- Reference: https://onekey.dev/docs/api/crossref/work.md

### crossref.works_search

Search Crossref scholarly works.
- Price: 5 credits per fresh call. Status: stable. Returns: a list.
- Request: `GET https://api.onekey.dev/v1/crossref/works_search?q=graphene` with header `x-api-key: YOUR_API_KEY`
- Parameters:
  - `q` (string, required): Search query
- Fields returned: `content.id`, `content.title`, `content.type`, `paper.publisher`, `paper.journal`, `content.year`, `content.url`, `engagement.citations`, `author.displayName`
- Reference: https://onekey.dev/docs/api/crossref/works_search.md

## Sample request

```bash
curl "https://api.onekey.dev/v1/crossref/funder?id=100000001" \
  -H "x-api-key: YOUR_API_KEY"
```