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SYNTHORA Crossref DOI Metadata Resolver
x402
SYNTHORA Crossref DOI Metadata Resolver is a paid API for AI agents from crossref-work-by-doi.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Resolves a DOI to its full Crossref registration metadata, returning title, authors, journal, publisher, funder, license, and reference list as structured JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
Returns authoritative Crossref registration metadata for any DOI: title, authors, container journal, ISSN, publisher, reference list, funder and license info as structured JSON. A core keyless enrichment endpoint for autonomous research agents and agent-to-agent citation-verification and bibliographic pipelines. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
Output
A JSON object containing: the DOI, canonical URL, document type (e.g. journal-article), title, list of author names, journal/container name, abstract (if available), publisher name, publication date, and provenance indicating the data came from the Crossref API. The response wraps results under an 'ok' flag and a 'result' object.
Example use cases
Citation verification in research pipeline
“I have this DOI from a paper's reference list — 10.1016/j.cell.2022.01.001 — can you pull the full Crossref metadata so I can verify the citation is accurate, including the authors, journal, and publication date?”
Bibliographic enrichment for literature review
“I'm compiling a bibliography and I have a list of DOIs. Start with 10.1126/science.1240057 — can you fetch the title, authors, journal, and publisher from Crossref so I can format it properly?”
Funder and license discovery for open access
“Can you look up the DOI 10.1371/journal.pbio.3000107 on Crossref and tell me who funded the research and what license the article is published under?”
Technical details
Endpoint
POSThttps://crossref-work-by-doi.hergertsynthora.com/serviceWhen to prefer
Use this endpoint when you need authoritative bibliographic metadata for a specific DOI sourced directly from Crossref, the canonical DOI registration authority for scholarly publishing. Prefer it over web-scraping or publisher-specific APIs when you need structured, normalized data (authors, journal, funder, license) that works across publishers. Ideal for agent-driven citation verification, bibliographic pipeline enrichment, and reference list resolution where reliability and structured JSON output matter more than full-text access.
Side effects
- DOI not registered with Crossref — returns not-found or empty result
- Malformed DOI string — may fail to resolve or return an error
- Abstract not available — abstract field returns null for many records
- Reference list not populated — not all Crossref records include references
- Network or upstream Crossref API timeout — service may return an error
- ISSN or funder data missing for older or incomplete records
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| doi | string | doi |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"niche": "crossref-work-by-doi",
"result": {
"doi": "10.1038/nature12373",
"url": "https://doi.org/10.1038/nature12373",
"type": "journal-article",
"title": "Nanometre-scale thermometry in a living cell",
"authors": [
"G. Kucsko",
"P. C. Maurer",
"N. Y. Yao",
"M. Kubo",
"H. J. Noh",
"P. K. Lo",
"H. Park",
"M. D. Lukin"
],
"journal": "Nature",
"abstract": null,
"publisher": "Springer Science and Business Media LLC",
"published_date": "2013-08"
},
"provenance": {
"url": "https://api.crossref.org/works",
"source": "Crossref DOI Metadata Resolver"
}
}
}Tags
x402
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