It would be awesome we could schedule Substack Notes (and newsletters?). I’d like to start on Substack but I need a way to plan content ahead. :) Thanks a lot!
We are closing this one: Substack has no public write API. Their official Developer API (terms updated January 2026) only returns public profile data for creators who link a LinkedIn handle, with no endpoint for creating a Note, a draft, or a newsletter post, scheduled or otherwise. The only remaining route is the private, cookie-authenticated endpoints their web app calls, which we will not build a paid API product on (they change without notice and put your account at risk). The nearest thing that works today is writing the post in Substack and using Zernio to schedule the promotion of each issue across X, LinkedIn, Threads and Bluesky. If Substack ships a public write API for Notes or posts, we will add it.
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Miquel Palet López
Aug 26
We are closing this one: Substack has no public write API. Their official Developer API (terms updated January 2026) only returns public profile data for creators who link a LinkedIn handle, with no endpoint for creating a Note, a draft, or a newsletter post, scheduled or otherwise. The only remaining route is the private, cookie-authenticated endpoints their web app calls, which we will not build a paid API product on (they change without notice and put your account at risk). The nearest thing that works today is writing the post in Substack and using Zernio to schedule the promotion of each issue across X, LinkedIn, Threads and Bluesky. If Substack ships a public write API for Notes or posts, we will add it.