API Acre · Research Crossref DOI Metadata

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://apiacre.com/v1/research/crossref-doi-metadata", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "doi": "10.1038/s41586-021-03819-2"
  }),
});
const data = await res.json();

curl -X POST \
  "https://apiacre.com/v1/research/crossref-doi-metadata" \
  -H "Content-Type: application/json" \
  -d '{"doi":"10.1038/s41586-021-03819-2"}' \
  -H "X-PAYMENT: <signed x402 payment>"

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