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API Direct – Search Substack Users
x402
API Direct – Search Substack Users is a paid API for AI agents from x402.apidirect.io, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-30).
Search Substack authors and publication profiles by name or keyword, returning paginated results.
Price / call$0.004
Success—
StatusUnknown
How this service works
Search Substack authors and publication profiles by name or keyword.
Output
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.
Example use cases
Find a known writer's Substack
“I'm looking for a Substack author named Morgan Housel — can you search Substack users for that name and show me their profile?”
Discover niche newsletter writers
“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.”
Research competitors in a content space
“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?”
Technical details
Endpoint
GEThttps://x402.apidirect.io/v1/substack/users?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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