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What is Substack API?

Substack API allows Substack publications to access their content and display it on their own websites or applications. The API provides:
  • Fast and reliable access to your publication’s content
  • Simple authentication using API keys
  • Free to use with generous rate limits

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Available Endpoints

Latest Posts

Get the latest posts from your publication.

Top Posts

Get the most popular posts from your publication.

Search Posts

Search for posts in your publication.

Single Post

Get a single post from your publication by slug.

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How to get started

1

Generate an API Key

Visit the API Key Generator to create your API key. You’ll need your Substack publication URL.
2

Use the API Key

Include your API key in the X-API-Key header when making requests to the API.
3

Explore the API

Refer to the API Reference for detailed endpoint documentation and examples.
You can try out the API without an API key using the Try it feature available for all endpoints.
For a detailed walkthrough, check out our video tutorial and step-by-step guide in the Quickstart page.

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