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API Direct – Search Substack Publications
x402
API Direct – Search Substack Publications 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 publications by name or keyword, with optional language and pagination filters.
Price / call$0.004
Success—
StatusUnknown
How this service works
Search Substack publications by name or keyword.
Output
Returns a paginated list of Substack publications matching the search query, including publication names, descriptions, and metadata. Up to 20 results per page, across up to 4 pages.
Example use cases
Discover newsletters on a niche topic
“Find me Substack newsletters about climate science — show me the first page of results.”
Search for a specific publication by name
“Can you look up Substack publications with 'Morning Brew' in the name?”
Find foreign-language Substack content
“Search Substack for newsletters about politics, but rank Spanish-language publications first — page 1 please.”
Technical details
Endpoint
GEThttps://x402.apidirect.io/v1/substack/publications?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover or search for Substack publications by topic or name, especially when you want paginated browsing or language-ranked results. Prefer this over manually scraping Substack or using generic web search when you need structured publication metadata.
Side effects
- Empty results if the keyword matches no publications
- Pagination out of range if page > 4 is requested
- Query too long if keyword exceeds 500 characters
- Invalid language code if not a valid 2-letter ISO code
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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