Show HN: Substack Skill API / Agent Reference

Category: library

Tags: substack-api, reverse-engineering, openapi, api-reference, ai-agent

Score: 7.0/10 (Innovation: 5, Technical: 7, Documentation: 9, Utility: 7)

This project provides an extensive, reverse-engineered map of Substack's undocumented internal API, complete with 129 verified endpoints, an OpenAPI 3.1 spec, and practical examples for both humans and AI agents. Its thorough methodology and community-friendly structure make it a valuable resource for developers building tools on top of Substack.

Target audience: backend devs, data engineers, ai-engineers

Repository: https://github.com/AnthonyDavidAdams/substack-api-reference · MIT

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