{"uid":"cap_sx3oZWdQMkFtWhDjqY96g","slug":"free-books-natural-history-59a6de5c","name":"free-books-natural-history","description":"Free public-domain books on \"Natural history\": browse the catalogue's works tagged with that Library of Congress subject (617 in Project Gutenberg alone, plus Internet Archive scans), ranked by relevance and popularity, with direct epub/txt/html download links. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.","url":"https://intel.rallylive.ca/library/subject/natural-history","method":"GET","headers":{},"bodySchema":{"type":"object","$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","properties":{}}},"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":"unknown","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_WyL0520mhyFZIsTgYEiSQ","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":"Browse and download public-domain books on Natural History from Project Gutenberg and Internet Archive, ranked by relevance and popularity, with epub/txt/html links.","exampleAgentPrompt":"Can you find me a list of free public-domain books on natural history — ideally something by Darwin or Audubon — with links I can download in epub or txt format?","exampleUseCases":[{"title":"Research classic natural history texts","prompt":"Can you browse the free public-domain natural history catalogue and show me popular titles I can download as epub or txt? I'm looking for foundational works on animals and ecology."},{"title":"Find books by a specific author","prompt":"Search the free natural history book catalogue for anything written by Charles Darwin that I can download — show me the title, format options, and a direct download link."},{"title":"Narrow results by topic keyword","prompt":"Can you pull up free downloadable natural history books with 'birds' in the title from the public domain catalogue? I want epub or html versions if possible."}],"resultDescription":"A paginated list (20 per page) of public-domain Natural History books including titles, authors, relevance/popularity rankings, and direct download links in epub, txt, and/or html formats, sourced from Project Gutenberg and Internet Archive and re-verified daily.","failureModes":["No results returned if query keywords are too specific or misspelled","Pagination out of range returns empty result set","Download links may occasionally be stale between daily re-verification cycles","Rate or payment failure if USDC balance is insufficient for the $0.01 per call fee"],"whenToPreferThis":"Choose this endpoint when you need a curated, daily-verified catalogue of public-domain Natural History books with direct download links, especially when you want to filter by title or author keyword within that subject. Prefer it over a generic web search when you specifically need epub/txt/html download links and ranked results from Project Gutenberg or Internet Archive.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:21:43.396Z","isFirstParty":false}