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API Acre Crossref Work Search
x402
API Acre Crossref Work Search is a paid API for AI agents from apiacre.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).
Search Crossref's open bibliographic metadata by title, author, DOI fragment, or citation query and return normalized publication, author, citation, license, and update metadata.
Price / call$0.008
Success—
StatusUnknown
How this service works
Search open Crossref bibliographic metadata by title, author, DOI fragment, or citation and return bounded normalized publication, author, citation, license, and update metadata without abstracts or full text.
Output
Returns bounded normalized records containing publication metadata (title, DOI, work type, publication date), author details, citation counts, license information, and update metadata — without abstracts or full text.
Example use cases
Citation metadata lookup for a paper
“Find me the Crossref metadata for a journal article titled 'Attention Is All You Need' by Vaswani et al. — I need the DOI, authors, publication date, and citation count, sorted by relevance, returning 5 results.”
Discovering recent preprints on a topic
“Search Crossref for the 10 newest posted-content works about CRISPR gene editing published from 2022 onwards, sorted by newest, so I can see what preprints are out there.”
Building a bibliography for a literature review
“I'm doing a literature review on climate change mitigation — can you pull up to 20 journal articles from Crossref on that topic sorted by most cited, published between 2018 and 2023, and give me the normalized author and license metadata?”
Technical details
Endpoint
POSThttps://apiacre.com/v1/research/crossref-work-searchWhen to prefer
Choose this endpoint when you need open, structured bibliographic metadata from Crossref — including DOIs, authors, citation counts, and license info — without needing abstracts or full text. Prefer it over general web search when you want normalized, machine-readable scholarly metadata across all work types (journal articles, datasets, dissertations, preprints, etc.) and need filtering by date range, work type, or sort order.
Side effects
- Query too vague or short returns low-relevance results
- Crossref has no matching records for an obscure DOI fragment
- published_from or published_until in unsupported date format causes validation error
- max_results set too high may be capped or slow
- Work type filter excludes relevant results if incorrectly specified
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | |
| sort_by | string | |
| work_type | — | |
| max_results | integer | |
| published_from | — | |
| published_until | — |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"query": {
"sortBy": "relevance",
"workType": "journal-article",
"bibliographic": "agentic commerce payment protocols",
"publishedFrom": null,
"publishedUntil": null
},
"source": "https://api.crossref.org/works",
"results": [
{
"doi": "10.1000/apiacre.example",
"type": "journal-article",
"title": "A bounded example scholarly work",
"authors": [
{
"name": "Ada Example",
"given": "Ada",
"orcid": null,
"family": "Example",
"affiliations": [
"Example Institute"
]
}
],
"publishedDate": "2026-08-20"
}
],
"limitations": [
"Demonstration metadata only; paid calls return current publisher-deposited re...",
"Abstracts and full text are deliberately excluded."
],
"retrievedAt": "2026-08-20T12:00:00+00:00",
"totalResults": 1,
"documentation": "https://www.crossref.org/documentation/retrieve-metadata/rest-api/",
"metadataLicense": {
"url": "https://www.crossref.org/documentation/retrieve-metadata/",
"name": "Open bibliographic metadata / Crossref-generated data CC0",
"abstractsReturned": false
},
"resultsReturned": 1
},
"meta": {
"cached": false,
"sources": [],
"warnings": [],
"duration_ms": 42,
"next_actions": [
{
"path": "/v1/research/crossref-doi-metadata",
"title": "Crossref DOI metadata enrichment",
"method": "POST",
"reason": "Resolve one selected scholarly-search candidate into a focused current DOI me...",
"service": "research.crossref-doi-metadata"
}
]
},
"service": "research.crossref-work-search",
"version": "1",
"request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a"
}
}Tags
x402
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