research · doi-lookup · publication-metadata · scholarly-data · citation-metadata · crossref · open-data

Crossref DOI metadata enrichment

Resolve one DOI into normalized open Crossref bibliographic, author, container, citation-count, license, identifier, and correction or retraction-link metadata without abstracts or full text.

$0.003 USDCBase + Solanax402 v2POST

Pay $0.003 USDC and run in your browser View free result sample

Endpoint

https://apiacre.com/v1/research/crossref-doi-metadata

Send the JSON body below. An unpaid request returns HTTP 402 with a PAYMENT-REQUIRED header; an x402-compatible buyer signs the requirement and retries with PAYMENT-SIGNATURE.

Pay $0.003 USDC and run in your browser

Official Coinbase agent path

Coinbase Agentic Wallet can satisfy this x402 request in one command. Running it may pay automatically, so --max-amount is fixed to $0.003 USDC in atomic units. Copying the command does not install, authenticate, sign, or pay; review the request and use a separate low-value wallet before running it.

npx --yes awal@latest x402 pay https://apiacre.com/v1/research/crossref-doi-metadata \
  -X POST \
  -d '{"doi":"10.1038/s41586-021-03819-2"}' \
  --max-amount 3000 \
  --json

Coinbase pay-for-service documentation · Buyer setup and wallet safety

Alternative third-party AgentCash commands

Run check first without payment. Its fetch command may automatically pay up to the exact listed price.

npx --yes agentcash@latest check https://apiacre.com/v1/research/crossref-doi-metadata
npx --yes agentcash@latest fetch https://apiacre.com/v1/research/crossref-doi-metadata \
  --method POST \
  --header 'content-type: application/json' \
  --body '{"doi":"10.1038/s41586-021-03819-2"}' \
  --payment-protocol x402 \
  --payment-network base \
  --max-amount 0.003

AgentCash CLI documentation

Input example

{
  "doi": "10.1038/s41586-021-03819-2"
}

Response shape

View free static sample JSON

{
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "research.crossref-doi-metadata",
  "version": "1",
  "data": {
    "doi": "10.1038/s41586-021-03819-2",
    "status": "matched",
    "work": {
      "doi": "10.1038/s41586-021-03819-2",
      "title": "Example normalized DOI record",
      "type": "journal-article",
      "publishedDate": "2021-08-25",
      "authors": [],
      "publisher": "Springer Science and Business Media LLC",
      "containerTitle": "Nature",
      "subjects": [],
      "language": "en",
      "doiUrl": "https://doi.org/10.1038/s41586-021-03819-2",
      "resourceUrl": "https://api.crossref.org/works/10.1038%2Fs41586-021-03819-2",
      "referenceCount": 0,
      "citedByCount": 0,
      "issn": [],
      "isbn": [],
      "licenses": [],
      "updates": []
    },
    "source": "https://api.crossref.org/works/10.1038%2Fs41586-021-03819-2",
    "retrievedAt": "2026-08-20T12:00:00+00:00",
    "documentation": "https://www.crossref.org/documentation/retrieve-metadata/rest-api/",
    "metadataLicense": {
      "name": "Open bibliographic metadata / Crossref-generated data CC0",
      "url": "https://www.crossref.org/documentation/retrieve-metadata/",
      "abstractsReturned": false
    },
    "limitations": [
      "Demonstration metadata only; paid calls return the current DOI record.",
      "Abstracts and full text are deliberately excluded."
    ]
  },
  "meta": {
    "duration_ms": 42,
    "cached": false,
    "sources": [],
    "warnings": [],
    "next_actions": []
  }
}

Try the payment challenge

curl -i -X POST 'https://apiacre.com/v1/research/crossref-doi-metadata' \
  -H 'content-type: application/json' \
  --data '{"doi":"10.1038/s41586-021-03819-2"}'