{"uid":"cap_Zie2CYtvY3n26NjD6XEjr","slug":"sitesignal-crossref-doi-metadata-12b7b55b","name":"SiteSignal Crossref DOI Metadata","description":"Return bounded bibliographic, authorship, publication, subject, funding, license, and citation-count metadata for one DOI from Crossref.","url":"https://trinity-throw-thursday-gravity.trycloudflare.com/x402/doi-metadata","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["doi"],"properties":{"doi":{"type":"string","maxLength":255,"minLength":7,"description":"Bare DOI without a doi.org resolver URL."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KFoZJa6bGI0pCeLy7Tek8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns bounded bibliographic, authorship, publication, subject, funding, license, and citation-count metadata for a single DOI from Crossref.","exampleAgentPrompt":"Can you pull up the full bibliographic details for DOI 10.1038/nature12373 — I need the authors, journal, publication date, citation count, and license information?","exampleUseCases":[{"title":"Verifying citation count for a paper","prompt":"What's the current citation count and publication year for the paper with DOI 10.1016/j.cell.2020.02.052?"},{"title":"Checking license before reuse","prompt":"I need to know the license on the article with DOI 10.1371/journal.pmed.1003326 — is it open access and can I republish it?"},{"title":"Enriching research bibliography with metadata","prompt":"Fetch me the full author list, journal name, and subject classifications for DOI 10.1126/science.aav9771 so I can add it to my bibliography."}],"resultDescription":"A structured record containing bibliographic metadata (title, authors, abstract), publication details (journal, publisher, volume, issue, page numbers, publication date), subject/category classifications, funding acknowledgements, license terms, and the Crossref citation count for the requested DOI.","failureModes":["DOI not found in Crossref — returns empty or error response","Malformed DOI string (too short, invalid prefix) — rejected by input validation","DOI exists but metadata is sparse (common for older articles) — partial fields returned","Crossref API downtime or rate limiting — upstream timeout or error","Payment failure — endpoint requires $0.01 USDC x402 payment before serving response"],"whenToPreferThis":"Use this endpoint when you need structured, authoritative bibliographic metadata for a known DOI from Crossref's database, particularly when citation counts, funding details, and license terms are required alongside standard bibliographic fields. Prefer this over scraping publisher pages or using general web search when you need machine-readable, normalized metadata for academic literature workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T15:26:50.473Z","isFirstParty":false}