{"uid":"cap_TGvwAQLfJrMb5gA59_sti","slug":"substack-publication-recommendations-lookup-73b91b58","name":"Substack Publication Recommendations Lookup","description":"Get the publications a Substack publication recommends to its readers, and the publications that recommend it.","url":"https://x402.apidirect.io/v1/substack/publication/recommendations?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":[],"properties":{"publication":{"type":"string","maxLength":500,"description":"Publication subdomain (lenny), host (lenny.substack.com, www.lennysnewsletter.com) or any URL on it (max 500 characters). Provide either publication or publication_id."},"publication_id":{"type":"string","description":"Numeric publication ID, as returned in publication_id. Provide either publication or publication_id."}}}},"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_7wiW2g4YFK5KbeQr-nK2-","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":"Returns the Substack publications that a given publication recommends to its readers, and the publications that recommend it in return.","exampleAgentPrompt":"Can you pull up the list of Substack newsletters that Lenny's Newsletter (lenny.substack.com) recommends to its readers, and also which publications recommend it back?","exampleUseCases":[{"title":"Mapping competitor newsletter networks","prompt":"I'm launching a newsletter in the product management space — can you show me which publications The Pragmatic Engineer recommends and which ones recommend it back? I want to understand who's in that ecosystem."},{"title":"Finding cross-promotion partners","prompt":"I run a Substack called The Bootstrapper and I want to find newsletters already recommending publications similar to mine. Can you look up the recommendations for 'indie hackers' on Substack so I can see potential partners?"},{"title":"Researching a newsletter's editorial affiliations","prompt":"Before I subscribe to a new Substack, I want to know who they endorse and who endorses them — can you check the recommendations for www.noahpinion.blog?"}],"resultDescription":"Returns two lists: (1) publications this Substack recommends to its readers, and (2) publications that recommend this Substack — each entry likely includes publication name, subdomain/host, and publication ID, enabling further graph traversal or filtering.","failureModes":["Publication not found if subdomain/host/URL is misspelled or doesn't exist on Substack","Missing required input if neither publication nor publication_id is provided","Empty recommendation lists if the publication has no mutual recommendations set up","Rate limiting or payment failure if x402 micropayment is not correctly handled","Stale data if Substack recently changed a publication's recommendation settings"],"whenToPreferThis":"Use this endpoint when you need to explore the editorial recommendation graph of Substack publications — particularly for competitive research, partnership discovery, or newsletter ecosystem mapping. Prefer it over generic web scraping when you need structured, machine-readable recommendation data tied to a specific Substack publication by subdomain, host, or numeric ID.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:07:50.954Z","isFirstParty":false,"canonicalSlug":"substack-publication-recommendations-lookup-73b91b58"}