Content Aggregation
Create a unified content feed from multiple Substack publications. Build curated newsletter digests, topic-specific reading lists, or cross-publication search engines. The Posts and Post Content APIs give you everything needed to aggregate, filter, and redistribute Substack content programmatically.
How it works
Register your sources
Define a list of Substack publication slugs you want to aggregate content from.
Poll for new posts
Periodically hit the Posts API for each publication with date filters to catch new content.
Fetch full content
Use the Post Content API to get the full text for summarization, indexing, or display.
Build your feed
Merge posts chronologically, apply filters (topic, author, free/paid), and serve via your own API or email digest.
Endpoints used
Related
Posts API
Fetch a paginated feed of posts from any Substack publication. Each post includes title, subtitle, p...
Post Content API
Get the complete body of any Substack post. Returns content in both HTML and plaintext formats with ...
Newsletter Analytics
Track publication growth, posting frequency, engagement trends, and author activity across Substack ...
Start building today
Create a free account and start pulling structured Substack data in minutes.