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does-site-use-substack
x402
does-site-use-substack is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).
Detects whether a given website uses Substack by fetching its homepage and matching Substack-specific fingerprints in the HTML and response headers.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
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').
Example use cases
Competitor newsletter platform research
“I'm building a list of top finance newsletters — can you check whether morningbrew.com uses Substack for their publishing platform?”
Sales prospecting for Substack alternatives
“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.”
Pre-migration technical audit
“We're thinking of moving our publication off Substack — can you confirm whether our site atlasobscura.com is currently detected as using Substack?”
Technical details
Endpoint
GEThttps://site.intel.rallylive.ca/site/uses/substack?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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