Substack Posts

/substack.posts

Pull posts from any Substack publication by its URL, or pass a single post URL (…/p/slug) to fetch just that one article. Returns title, subtitle, publish date, paywall status, word count, engagement (reactions, comments, restacks), author profile, publication details, the full article body as text, HTML and Markdown, and optional comment threads.

Finished calls, last 7 days: 0

Cancellations excluded. Execution times cover successful calls.

Docs

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Use it with your agent

Set up https://www.agentrouter.to/SKILL.md, then use AnyAPI’s /substack.posts endpoint through AgentRouter.

Inputs

urlRequired: Either a Substack publication URL / custom domain to fetch its recent posts (e.g. https://www.astralcodexten.com), OR a single post URL to fetch just that one article with full content (e.g. https://www.astralcodexten.com/p/your-book-review).
limitOptional: Maximum number of recent posts to return when given a publication URL (1-100, default 25); ignored for a single post URL, which always returns that one post. You are billed per post returned, so a lower limit costs less.
endDateOptional: Only return posts published on or before this date, format YYYY-MM-DD (e.g. 2024-12-31). Applied within the most recent 'limit' posts scanned.
onlyFreeOptional: Return only free (non-paywalled) posts (e.g. true).
startDateOptional: Only return posts published on or after this date, format YYYY-MM-DD (e.g. 2024-01-01). Applied within the most recent 'limit' posts scanned, so raise 'limit' to reach older date ranges.
contentTypeOptional: Restrict to a single post type, or 'all' (e.g. newsletter).
maxCommentsOptional: Maximum comments collected per post when 'includeComments' is true (0-500, default 20). Costs nothing extra (e.g. 50).
minCommentsOptional: Only return posts with at least this many comments (e.g. 10).
minReactionsOptional: Only return posts with at least this many reactions (e.g. 100).
minWordCountOptional: Only return posts with at least this many words, which filters out short notes and announcements (e.g. 1000).
includeContentOptional: Include the full article body as text, HTML and Markdown. Set false for metadata only, which is faster (e.g. false).
includeCommentsOptional: Include public comment threads and their direct replies on each post (e.g. true).
preferLatencyUnderMsOptional: Optional; omit it and routing is unchanged, with the cheapest source serving. Prefer sources whose typical response time (median over the trailing 30 days, as published on this endpoint's lane health) is under this many milliseconds; among those, the cheapest serves. This can raise your price: when the cheapest source misses the target, a faster and dearer one serves, and you are quoted and charged its price. If no source is that fast the request is still served, by whichever source offers the best speed for its price - it is never refused for being slow. Sources we have not timed are tried last. This is a preference, not a guarantee: the median describes past requests and is not a ceiling on this one, and it excludes any wait this request itself asks for. On a paginated walk it applies to the first page only: later pages stay with the source that page chose, at the price it was quoted.
sourceOptional: Optional. Source ids to prefer, in order, taken from this endpoint's `lanes[].source.id` in /catalog or /apis. Omit it and the cheapest source serves, with automatic failover. Listed sources are tried first in the order given, then the others, unless `allowFallbacks` is false. A single source with `allowFallbacks` false is served only by that source at its price, quoted and charged exactly, with no failover. The price is that of the dearest source that may serve. An id that does not serve this endpoint is rejected as invalid input with no charge; a listed source that is not serving right now is refused with no charge, so omit `source` to be served by another. On a paginated walk, later pages must include the source that served page one, or omit `source`.
allowFallbacksOptional: Optional, default true. When false, only the sources listed in `source` may serve; the request is refused with no charge if none of them can. When true, the listed sources are tried first and any other source may serve after them, at the normal price.
ignoreSourcesOptional: Optional. Source ids to skip for this request, taken from this endpoint's `lanes[].source.id`. The cheapest remaining source serves and the price is that of the dearest remaining source. An id that does not serve this endpoint, or that is also in `source`, is rejected as invalid input with no charge; skipping every source is rejected the same way.

Example input

{
  "url": "https://www.astralcodexten.com",
  "limit": 3
}

Output

AnyAPI output: found (boolean), data (the record) and reason when nothing was found.