Research & science · x402

crossref-doi

DOI metadata from Crossref: type, title, container (journal/book), publisher, authors with ORCID and affiliations, dates, volume/issue/pages, ISSN/ISBN, licenses, abstract, subjects, citation counts, funders, and optionally the reference list.

0.002 USDC / call · {atomic} atomic · 2000 atomic

Endpoint

GET|POST https://forge-tools.dentreprise.workers.dev/api/crossref-doi

Parameters

Name	Required	Type	Description
`doi`	Required	string	DOI or doi.org URL
`references`	Optional	string	true to include references

Example request (unpaid — expect 402)

curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/crossref-doi?doi=10.1038%2Fnature12373"

Example 402 challenge

The same object is also sent as a base64 PAYMENT-REQUIRED header. Amounts are atomic USDC units (6 decimals).

{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://forge-tools.dentreprise.workers.dev/api/crossref-doi",
    "description": "DOI metadata from Crossref: type, title, container (journal/book), publisher, authors with ORCID and affiliations, dates, volume/issue/pages, ISSN/ISBN, licenses, abstract, subjects, citation counts, funders, and optionally the reference list.",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "2000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Retry with payment

curl -sS "https://forge-tools.dentreprise.workers.dev/api/crossref-doi?doi=10.1038%2Fnature12373" \
  -H "PAYMENT-SIGNATURE: $PAYMENT"

Example response

{
  "found": true,
  "title": "Nanometre-scale thermometry in a living cell",
  "container": "Nature"
}

Related endpoints

Research & science · x402

pubmed-search

PubMed / MEDLINE search with full records: PMID, title, authors, journal, year, volume/pages, DOI, PMCID, publication types, MeSH terms and abstract.

0.003 USDC/ call

Documentation →

Research & science · x402

arxiv-search

arXiv preprint search (plain words or arXiv field syntax ti:, au:, abs:, cat:) or id lookup: title, authors, dates, categories, abstract, DOI, journal ref, abs and PDF links.

0.002 USDC/ call

Documentation →