{"uid":"cap_1L81-M7aIoQhEF-0AlF6C","slug":"agentfeed-scholarly-paper-lookup-by-doi-fdbbfbb0","name":"AgentFeed Scholarly Paper Lookup by DOI","description":"Crypto market data for AI agents (liquidations, funding, open interest, prices), Solana pre-trade checks, OFAC sanctions screening, scholarly papers, utilities and fixed-purpose language tasks (OCR, translate, summarize, extract, classify, prompt-injection check, transcribe). Paid per call in USDC over x402 on Solana, Base, Polygon, Arbitrum, Arc, Algorand, Optimism, Monad or Avalanche. High-frequency callers pay half price (minimum $0.0005) through batch-settlement (open a channel once, then off-chain vouchers) on Base, Polygon, Arbitrum or Circle Gateway nanopayments on Base, Polygon, Arbitrum, Arc. No API key or account is needed to pay per call. Bots that cannot pay x402 can buy a prepaid key once ($0.25, $1, $5, $20; page at /keys) and send it as X-AgentFeed-Key: each call then costs half the route price, minimum $0.0005, drawn from the balance (GET /api/keys/balance, free). A 30-day bot pass for /api/liq-feed is $25 flat, with nothing drawn per call (/api/keys/buy-pass).","url":"https://x402.ochinimus.app/api/paper/%7Bdoi%7D?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"data":{"doi":"10.1038/nature14539","type":"article","year":2015,"title":"Deep learning","venue":"Nature","cached":false,"source":"OpenAlex (openalex.org)","authors":["Yann LeCun","Yoshua Bengio","Geoffrey E. Hinton"],"license":"CC0 (OpenAlex data is public domain)","abstract":null,"cited_by":83602,"language":"en","open_access":{"url":"https://hal.science/hal-04206682","is_oa":true},"openalex_id":"https://openalex.org/W2919115771","authors_total":3},"paid":true,"tool":"get_paper"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rl9ln4MixQAs-uw0-Dzm8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches metadata for a scholarly paper by its DOI, returning title, authors, venue, year, citation count, open-access URL, and abstract when available.","exampleAgentPrompt":"Can you pull up the metadata for the paper with DOI 10.1038/nature14539 — I need the title, authors, year, where it was published, and how many times it's been cited?","exampleUseCases":[{"title":"Citation count check for literature review","prompt":"I'm building a bibliography and need to know how many times the paper with DOI 10.1145/3292500.3330966 has been cited — can you look it up and also tell me the authors and venue?"},{"title":"Open access availability check","prompt":"Is the paper at DOI 10.1126/science.1248506 available as open access? Can you grab its metadata and include the open access URL if there is one?"},{"title":"Automatic paper enrichment in research tool","prompt":"I have a list of DOIs from my Zotero library and need full metadata for 10.1016/j.cell.2017.06.031 — title, authors, year, journal, abstract, and citation count please."}],"resultDescription":"A JSON object containing the paper's DOI, type, year, title, venue, authors list, total author count, language, citation count, abstract (if available), open-access status and URL, OpenAlex ID, data source attribution, license, and a flag indicating whether the result was served from cache.","failureModes":["DOI not found in OpenAlex — returns error or empty data","Malformed or non-existent DOI returns 404 or error response","Abstract unavailable for many papers (returns null)","Payment failure via x402 if insufficient USDC balance","Rate limiting or network timeout for very high-frequency calls without channel or prepaid key"],"whenToPreferThis":"Choose this endpoint when you need structured bibliographic metadata for a specific paper and have its DOI — it's ideal for citation enrichment, open-access discovery, and literature review automation. It does not require an API key (pay-per-call via x402 in USDC) and sources data from OpenAlex, which has broad coverage of academic literature. Prefer this over general web search when you need machine-readable, structured academic metadata rather than raw HTML.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T12:44:18.935Z","isFirstParty":false,"canonicalSlug":"agentfeed-scholarly-paper-lookup-by-doi-fdbbfbb0"}