API Acre · Research Crossref Work Search

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-work-search", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "max_results": 5,
    "query": "agentic commerce payment protocols",
    "sort_by": "relevance",
    "work_type": "journal-article"
  }),
});
const data = await res.json();

curl -X POST \
  "https://apiacre.com/v1/research/crossref-work-search" \
  -H "Content-Type: application/json" \
  -d '{"max_results":5,"query":"agentic commerce payment protocols","sort_by":"relevance","work_type":"journal-article"}' \
  -H "X-PAYMENT: <signed x402 payment>"

{
  "data": {
    "documentation": "https://www.crossref.org/documentation/retrieve-metadata/rest-api/",
    "limitations": [
      "Demonstration metadata only; paid calls return current publisher-deposited re...",
      "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/"
    },
    "query": {
      "bibliographic": "agentic commerce payment protocols",
      "publishedFrom": null,
      "publishedUntil": null,
      "sortBy": "relevance",
      "workType": "journal-article"
    },
    "results": [
      {
        "authors": [
          {
            "affiliations": [
              "Example Institute"
            ],
            "family": "Example",
            "given": "Ada",
            "name": "Ada Example",
            "orcid": null
          }
        ],
        "doi": "10.1000/apiacre.example",
        "publishedDate": "2026-08-20",
        "title": "A bounded example scholarly work",
        "type": "journal-article"
      }
    ],
    "resultsReturned": 1,
    "retrievedAt": "2026-08-20T12:00:00+00:00",
    "source": "https://api.crossref.org/works",
    "totalResults": 1
  },
  "meta": {
    "cached": false,
    "duration_ms": 42,
    "next_actions": [
      {
        "method": "POST",
        "path": "/v1/research/crossref-doi-metadata",
        "reason": "Resolve one selected scholarly-search candidate into a focused current DOI me...",
        "service": "research.crossref-doi-metadata",
        "title": "Crossref DOI metadata enrichment"
      }
    ],
    "sources": [],
    "warnings": []
  },
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "research.crossref-work-search",
  "version": "1"
}