{"uid":"cap_gESWRSKm9Cnv-kd5y12yp","slug":"api-direct-search-substack-publications-bc45aeab","name":"API Direct – Search Substack Publications","description":"Search Substack publications by name or keyword.","url":"https://x402.apidirect.io/v1/substack/publications?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":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["query"],"properties":{"page":{"type":"integer","default":1,"maximum":4,"minimum":1,"description":"Page number for pagination (1-4). Each page returns up to 20 publications."},"query":{"type":"string","maxLength":500,"description":"Search keyword (max 500 characters)."},"language":{"type":"string","maxLength":2,"minLength":2,"description":"Two-letter language code, e.g. es, to rank publications in that language first"}}}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rZinjBB5akKUD4gCCaRkf","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Search Substack publications by name or keyword, with optional language and pagination filters.","exampleAgentPrompt":"Search Substack for publications about personal finance and return the first page of results.","exampleUseCases":[{"title":"Discover newsletters on a niche topic","prompt":"Find me Substack newsletters about climate science — show me the first page of results."},{"title":"Search for a specific publication by name","prompt":"Can you look up Substack publications with 'Morning Brew' in the name?"},{"title":"Find foreign-language Substack content","prompt":"Search Substack for newsletters about politics, but rank Spanish-language publications first — page 1 please."}],"resultDescription":"Returns a paginated list of Substack publications matching the search query, including publication names, descriptions, and metadata. Up to 20 results per page, across up to 4 pages.","failureModes":["Empty results if the keyword matches no publications","Pagination out of range if page > 4 is requested","Query too long if keyword exceeds 500 characters","Invalid language code if not a valid 2-letter ISO code"],"whenToPreferThis":"Use this endpoint when you need to discover or search for Substack publications by topic or name, especially when you want paginated browsing or language-ranked results. Prefer this over manually scraping Substack or using generic web search when you need structured publication metadata.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:07:43.840Z","isFirstParty":false,"canonicalSlug":"api-direct-search-substack-publications-bc45aeab"}