How to find Substack newsletters to sponsor (with real subscriber counts)
Newsletter ads work when the audience fits. Here is how to build a list of Substack newsletters in your niche with subscriber counts, contacts and how active they are.
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Newsletter ads work when the audience fits. Here is how to build a list of Substack newsletters in your niche with subscriber counts, contacts and how active they are.

Substack has no publishing API, its editor has no tables, and a link around inline code is dropped on paste. A step by step walk-through of the Substack destination in publishing-kit: what the editor keeps, what it drops, and how an agent publishes to it and reads the result back.

Substack has no publishing API, its editor has no tables, and a link around inline code is dropped on paste. A step by step walk-through of the Substack destination in publishing-kit: what the editor keeps, what it drops, and how an agent publishes to it and reads the result back.
I asked Codex to send a fresh agent to my newsletter and help a stranger decide whether to...

SavePoint Station Manager v1.75.0 has been released! π π This release puts a lot of focus on...
Substack takes 10% of revenue; Ghost and Beehiiv charge a flat fee instead. We run the 2026 numbers and show where each platform wins for a newsletter.
I created an API library that can sync any blog to Substack in one click. Notes and articles...
This was originally published on All Agents Considered. A little while ago, I shared how I built...
An independent, single-author experiment across AI output, human writing, meeting transcripts and edited drafts.
Substack is a great starting point, but its 10% fee becomes a serious tax on your success. Here's when and why to move to a platform you truly own.

Substack has introduced a new AI detection tool for newsletters that helps readers understand whether...

Why I moved from Substack to an owned newsletter, how I ported the archive, and what I am building from here.