The Autohive Substack integration connects to Substack’s public APIs, enabling:

  • Publication discovery - Search for Substack publications across the entire platform by keyword
  • Post archive browsing - List and paginate a publication’s posts with sorting and keyword filtering
  • Full post content - Fetch complete post content including body HTML for any public post
  • Post search - Search posts within a specific publication by keyword
  • Comment retrieval - Access comments on any post with sorting options

Use the integration

You can now use the integration with your agents, workflows, and scheduled tasks!

  1. Follow our Create your first agent guide on how to create an agent.
  2. In the Agent settings, scroll down to the Add capabilities section and turn on the Substack capability. You can choose which individual Substack capabilities to turn on and off.
  3. Once the settings have been selected, begin prompting the agent with the workflow you’d like to achieve with Autohive and Substack!

Available capabilities

Publication Discovery

  • Search Publications: Search for Substack publications across the entire platform by keyword, with pagination support

Post Operations

  • Get Publication Posts: List posts from a publication’s archive with sorting (newest or top), keyword filtering, and pagination
  • Get Post: Fetch full post content by slug, including body HTML, metadata, like counts, and comment counts
  • Search Posts: Search posts within a specific publication by keyword with pagination support

Comment Operations

  • Get Post Comments: Retrieve comments on a specific post with sort order control (best or newest) and nested reply support

Key features

No Authentication Required

  • All 5 actions work without any credentials or login
  • Accesses Substack’s public content APIs directly
  • No session cookies, OAuth tokens, or API keys needed

Flexible URL Input

  • Accepts full URLs (https://example.substack.com)
  • Accepts bare hostnames (example.substack.com)
  • Supports custom domains (https://newsletter.example.com)

Content Access

  • Retrieves full post HTML body for public posts
  • Paywalled posts return truncated body content for non-subscribers
  • Includes post metadata: publish date, audience, like count, comment count, reading time

Common use cases

Newsletter Research & Monitoring

  • Monitor specific Substack publications for new posts on topics of interest
  • Search across a publication’s archive to find relevant historical content
  • Track engagement metrics like likes and comments on published posts

Content Aggregation

  • Aggregate posts from multiple Substack publications into a single feed
  • Search for publications covering specific topics or niches
  • Pull post content for summarisation or analysis workflows

Competitive Intelligence

  • Monitor competitor or industry newsletters for new content
  • Search publication archives to track how topics evolve over time
  • Retrieve comment threads to gauge reader sentiment

Research & Discovery

  • Discover new publications on specific topics using keyword search
  • Browse author archives to find all posts on a subject
  • Extract post content for further processing or analysis

Notes

  • Substack has no official public API. This integration uses internal endpoints that are widely used but undocumented and may change without notice.
  • Get Post Comments requires the numeric post ID (the id field from Get Publication Posts or Get Post), not the post slug.
  • Paywalled post body HTML is truncated for non-subscribers.