{"uid":"cap_Y_zFJO6NCgSUnCKsZNhFX","slug":"does-site-use-substack-e045cb23","name":"does-site-use-substack","description":"Does a website use Substack? Fetches the page (homepage for a bare domain) and matches Substack's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (publishing). Technographics for sales, competitor research and migration planning, one technology per call. $0.01 per check.","url":"https://site.intel.rallylive.ca/site/uses/substack?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"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_FAqugZeL13FtVJRBoir3B","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":"Detects whether a given website uses Substack by fetching its homepage and matching Substack-specific fingerprints in the HTML and response headers.","exampleAgentPrompt":"Can you check if stratechery.com is running on Substack? I want to know if they use it for publishing before I reach out to pitch a migration.","exampleUseCases":[{"title":"Competitor newsletter platform research","prompt":"I'm building a list of top finance newsletters — can you check whether morningbrew.com uses Substack for their publishing platform?"},{"title":"Sales prospecting for Substack alternatives","prompt":"I'm pitching Ghost as a Substack alternative to indie publishers — can you check if every domain I give you is currently on Substack? Start with semafor.com."},{"title":"Pre-migration technical audit","prompt":"We're thinking of moving our publication off Substack — can you confirm whether our site atlasobscura.com is currently detected as using Substack?"}],"resultDescription":"Returns a yes/no boolean indicating whether the target website uses Substack, along with an evidence snippet (matching HTML or header content that triggered the fingerprint) and the technology category label ('publishing').","failureModes":["Domain is unreachable or returns a non-200 status — check may return an error or inconclusive result","Website uses heavy JavaScript rendering so the static homepage fetch misses Substack signals — false negative possible","Domain redirects to a subdomain or CDN that strips Substack headers — fingerprint match may fail","Rate limiting or bot-protection on the target site blocks the fetch — may return an error"],"whenToPreferThis":"Use this endpoint when you need a lightweight, low-cost ($0.01) single-domain check specifically for Substack usage, as part of sales prospecting, competitor research, or migration planning workflows. Prefer the sibling bulk endpoint if checking more than a few domains at once. Choose this over generic scraping tools when you need a pre-built, reliable fingerprint match specifically for Substack rather than a full technographic suite.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T12:36:47.988Z","isFirstParty":false,"canonicalSlug":"does-site-use-substack-e045cb23"}