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SYNTHORA Crossref Bibliographic Search
x402
SYNTHORA Crossref Bibliographic Search is a paid API for AI agents from crossref-works-search.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Full-text search across 150M+ Crossref-registered scholarly works, returning ranked results with DOI, title, authors, journal, publication date, and citation counts.
Price / call$0.001
Success—
StatusUnknown
How this service works
Free-text search across 150M+ Crossref registered works, returning DOI, title, authors, journal, publication date and citation counts ranked by relevance. Serves autonomous research agents and agent-to-agent literature-discovery and reference-resolution workflows as a keyless scholarly ranking surface. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
Output
A ranked list of matching scholarly works from the Crossref registry, each including the DOI, full title, author list, journal or publication venue, publication date, and citation count, returned as a JSON object under the 'result' key.
Example use cases
Literature review for research proposal
“Find me the most cited academic papers on transformer neural networks in natural language processing — I need the DOIs, authors, journal names, and publication dates so I can build a reference list.”
Verify and resolve partial citation
“I have an incomplete reference: something like 'Smith et al., 2019, climate feedback loops' — can you search Crossref to find the full bibliographic details including the DOI?”
Discover recent papers on emerging topic
“Search for scholarly works published about mRNA vaccine mechanisms — return the top results ranked by relevance with titles, authors, and citation counts so I can prioritize what to read.”
Technical details
Endpoint
POSThttps://crossref-works-search.hergertsynthora.com/serviceWhen to prefer
Choose this endpoint when an AI agent needs to discover, rank, or resolve scholarly literature by free-text query across a massive cross-publisher corpus without requiring an API key. Ideal for autonomous research agents performing literature reviews, reference resolution, or citation enrichment workflows. Prefer over PubMed-specific endpoints when breadth of coverage across all academic disciplines is needed, and over Google Scholar scrapers when structured bibliographic data (DOI, citation count) is required programmatically.
Side effects
- Empty result set if query is too specific or uses non-standard terminology
- Ambiguous or broad queries may return loosely related works
- Crossref coverage gaps for non-DOI-registered or pre-2000 literature
- Network or upstream Crossref API errors returning non-200 responses
- Payment failure (x402 protocol) preventing query execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | query |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"niche": "crossref-works-search",
"result": {}
}
}Tags
x402
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