{"uid":"cap_JQ-forX3KK9mKMwAhR3KP","slug":"ambolt-doi-lookup-d1ce4c6b","name":"Ambolt DOI Lookup","description":"Pay-per-call data tools for developers and AI agents: company registers, documents, tenders, rates and on-chain facts as MCP tools, x402 endpoints and Apify Actors.","url":"https://api.ambolt.dev/v1/doi-lookup?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"const":"http"},"method":{"enum":["GET","POST"]},"queryParams":{"type":"object","properties":{"doi":{"type":"string","pattern":"^10\\.\\d{4,9}/\\S+$","maxLength":200,"description":"DOI, e.g. 10.1038/nature14539."},"limit":{"type":"integer","default":5,"maximum":20,"minimum":1,"description":"Maximum search results."},"query":{"type":"string","maxLength":300,"description":"Citation or title text to search when no DOI is known."}},"additionalProperties":false}}}}},"responseSchema":{"type":"json","example":{"doi":"10.1038/nature14539","count":1,"works":[{"doi":"10.1038/nature14539","url":"https://doi.org/10.1038/nature14539","type":"journal-article","year":2015,"title":"Deep learning","authors":["Yann LeCun","Yoshua Bengio","Geoffrey Hinton"],"licenses":["https://www.springer.com/tdm","https://www.springer.com/tdm"],"container":"Nature","publisher":"Springer Science and Business Media LLC","citedByCount":77858,"referenceCount":103}],"source":"Source: Crossref REST API; metadata is available without restriction (CC0 facts).","fetchedAt":"2026-10-02T21:35:41.793Z"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_eMq2pwk2Sbuu6MDhEzMDA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up scholarly publication metadata by DOI or citation text search, returning title, authors, year, publisher, citation count, and license information via the Crossref REST API.","exampleAgentPrompt":"Can you look up the metadata for DOI 10.1038/nature14539? I want the title, authors, year, journal, publisher, and how many times it's been cited.","exampleUseCases":[{"title":"Verify citation details for a paper","prompt":"I have this DOI — 10.1126/science.1226461 — can you pull up the full citation info including title, authors, year, and which journal published it?"},{"title":"Find paper DOI by title search","prompt":"I'm trying to find the DOI and publication details for a paper called 'Attention Is All You Need' by Vaswani et al. — can you search for it and return the metadata?"},{"title":"Check citation count for literature review","prompt":"For my literature review I need to know how many times the paper with DOI 10.1016/j.cell.2018.02.052 has been cited — can you look that up along with the authors and journal?"}],"resultDescription":"Returns a JSON object containing the resolved DOI, canonical URL, article type, publication year, title, author list, license URLs, journal/container name, publisher name, cited-by count, reference count, data source attribution, and fetch timestamp. Up to 20 results can be returned per search query.","failureModes":["Invalid DOI format (must match ^10\\.\\d{4,9}/\\S+$) results in a validation error","DOI not found in Crossref returns an empty works array","Search query with no matching results returns count of 0","Network timeout or Crossref API unavailability causes a service error","Payment of $0.003 USDC required per call via x402 protocol; missing payment returns 402"],"whenToPreferThis":"Choose this endpoint when you need structured bibliographic metadata — authors, year, journal, publisher, citation count, license — for a known DOI or when searching by title/citation text. Ideal for academic research workflows, automated literature reviews, citation verification, or enriching datasets with scholarly metadata. Prefer over general web search when you need structured, machine-readable Crossref metadata rather than scraped HTML.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:43:12.224Z","isFirstParty":false,"canonicalSlug":"ambolt-doi-lookup-d1ce4c6b"}