Crossref DOI Search

x402

Crossref DOI Search is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Searches Crossref's academic metadata database by DOI to retrieve bibliographic details about scholarly publications.

Price / call$0.002

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Success—

StatusUnknown

How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

Output

Returns a JSON object with ok:true and bibliographic metadata for the queried DOI, including title, authors, journal, publication date, publisher, abstract (if available), and citation counts sourced from the Crossref database.

Example use cases

Verify paper citation details

“I need to verify the full citation for DOI 10.1016/j.cell.2023.01.005 — can you pull the title, authors, journal name, and year from Crossref?”

Enrich reference list with metadata

“I have this DOI from a paper I'm citing: 10.1126/science.abc1234 — fetch me the bibliographic details so I can format a proper reference.”

Check if DOI resolves to real paper

“Can you search Crossref for DOI 10.1371/journal.pone.0123456 and confirm it's a real published article, and if so, what it's about?”

Technical details

Endpoint

GEThttps://x402-toolbox.shablony-pro.workers.dev/research/crossref-doi-search?utm_source=zero.xyz

When to prefer

Use this endpoint when you need structured bibliographic metadata for a specific academic DOI without signing up for a Crossref API key. Ideal for AI agents that need to enrich citations, verify publication details, or resolve DOIs programmatically at low cost ($0.002/call) with no credential management — payment via USDC on Base is the only requirement.

Side effects

DOI not found in Crossref database — returns empty or error result
Malformed DOI string causes lookup failure
Crossref API rate limiting or downtime propagates as error
Payment failure over x402 prevents request from being processed
Incomplete metadata returned if Crossref record is sparse

Input

Schema · Request body

Field	Type	Description
schema	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "paid": true
  }
}

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