APIs for your Substack
Short answer
newsletterapi gives your Substack publication a REST API and an MCP server: your posts and full archive as clean JSON or Markdown, archive search for AI agents, automatic backups, website embeds and growth stats. You connect by pasting your publication URL; everything is read-only and nothing logs in as you. Get access by email.
Writer plan
Posts & Archive API
Your whole Substack archive as clean JSON, Markdown or HTML: list, get, search, tags, authors and images.
6 endpoints · 3 MCP tools
Writer plan
MCP server for AI agents
A hosted MCP server that lets Claude, ChatGPT and other agents read your archive, learn your voice and draft with it.
4 endpoints · 6 MCP tools
Writer plan
Automatic backups
Every Substack post, with images, backed up as Markdown and HTML to GitHub, Google Drive, Dropbox or S3.
5 endpoints · 2 MCP tools
Pro plan
Website embeds & content webhooks
Show your Substack posts on your own site with CORS-friendly JSON and widgets, and get a webhook when you publish.
5 endpoints · 2 MCP tools
Writer plan
Subscriber analytics from your export
Upload your Substack export and get growth, cohorts, engagement segments and source quality, via dashboard, API or MCP.
5 endpoints · 4 MCP tools
Free plan
Import converter
Convert Medium, Ghost, WordPress, Google Docs, Markdown or TinyLetter archives into a file for Substack's importer.
4 endpoints · 2 MCP tools