{"uid":"cap_v8z2uxHHK8pJBzPPFwVKU","slug":"api-direct-search-substack-users-a3d3b034","name":"API Direct – Search Substack Users","description":"Search Substack authors and publication profiles by name or keyword.","url":"https://x402.apidirect.io/v1/substack/users?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 profiles."},"query":{"type":"string","maxLength":500,"description":"Search keyword (max 500 characters)"}}}},"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_267j70WxDgbCTRAajNL3-","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 authors and publication profiles by name or keyword, returning paginated results.","exampleAgentPrompt":"Can you search Substack for authors writing about personal finance — show me the first page of results?","exampleUseCases":[{"title":"Find a known writer's Substack","prompt":"I'm looking for a Substack author named Morgan Housel — can you search Substack users for that name and show me their profile?"},{"title":"Discover niche newsletter writers","prompt":"Search Substack for authors writing about climate tech and show me the first page of results so I can find some good newsletters to follow."},{"title":"Research competitors in a content space","prompt":"I want to know who the main Substack writers are in the productivity and self-improvement space — can you search for 'productivity' on Substack users and return page 1?"}],"resultDescription":"A paginated list (up to 20 per page, pages 1–4) of Substack author and publication profiles matching the search keyword, including user names, profile details, and associated metadata.","failureModes":["Empty results if the keyword matches no Substack users","Page number out of range (must be 1–4) returns an error","Query exceeding 500 characters is rejected","Rate limiting or payment failure returns a 402 error","Network timeout if Substack's underlying data is slow to respond"],"whenToPreferThis":"Use this endpoint when you need to search for Substack authors or creators by name or topic keyword, especially when you have a person's name or a niche subject and want to discover who is publishing on Substack. Prefer this over the publication search endpoint when the target is a person/author rather than a named publication. It is ideal for author discovery, competitive research on content creators, and finding subject-matter experts on Substack.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:06:39.065Z","isFirstParty":false,"canonicalSlug":"api-direct-search-substack-users-a3d3b034"}