Substack terms of service

Substack grants you a limited, revocable, non-exclusive, non-transferable, non-sublicensable license to access and use the API solely for the Permitted Uses described in these API Terms.

Display or present public creator or publication information

Enable discovery, analytics, or integrations involving public profiles or publications

You agree that you will only use Substack for your own personal or organizational use, and not on behalf of or for the benefit of any third party.

Sell, license, sublicense, or redistribute Authorized Data as a standalone product or dataset

Use the API to replicate, substitute for, or materially compete with core features of the Substack platform

Use Authorized Data for unsolicited communications, spam, or harassment

Use the API or Authorized Data to derive, infer, or attempt to determine any non-public, sensitive, or personal attributes of a creator

“Crawls,” “scrapes,” or “spiders” any page, data, or portion of Substack (through use of manual or automated means);

Copies or stores any significant portion of the content on Substack;

Runs Maillist, Listserv, any form of auto-responder or “spam” on Substack, or any processes that run or are activated while you are not logged into Substack

Decompiles, reverse engineers, or otherwise attempts to obtain the source code or underlying ideas or information of or relating to Substack.

You may cache Authorized Data only as reasonably necessary to support your application, and you must refresh or delete cached data to ensure consistency with the current public state.

Sell, license, sublicense, or redistribute Authorized Data as a standalone product or dataset

Where reasonably practicable, you must attribute Authorized Data to Substack and provide a link to the applicable public profile or publication.

These API Terms are governed by the laws of California.

TO THE MAXIMUM EXTENT PERMITTED BY LAW, SUBSTACK SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, OR PUNITIVE DAMAGES ARISING OUT OF OR RELATING TO THE API OR AUTHORIZED DATA.

Substack may suspend or terminate your access to the API immediately, with or without notice, if Substack determines that your use of the API or Authorized Data violates the Agreement or poses a risk to creators, users, or the platform.

Substack may modify or discontinue the API or these API Terms at any time.

Your use of the API is subject to rate limits, quotas, and other technical restrictions as determined by Substack in its sole discretion.