substack.com

Substack is a publishing and subscription platform for newsletters, posts, and creator-audience communication. It lets writers publish content and manage subscriber relationships on the web and in apps.

1 integration · MCP

Substack exposes an OAuth-protected MCP server at https://mcp.substack.com/api/v1/mcp; I found no public HTTP/REST, GraphQL, or CLI developer surface on substack.com itself.

discovered 2mo ago

MCP servers1

Substack MCP Serverdetectedstreamable-http

Credentials

OAuth 2.0oauth2

OAuth 2.0 — self-onboarding

Point your MCP client at the server URL and approve access in the browser. The server supports OAuth Dynamic Client Registration (RFC 7591), so the client registers itself automatically — no developer-portal app, client_id, or client_secret to create.

conventions · 1/8 published

integrations.json✗/.well-known/integrations.json
llms.txt✗/llms.txt
API catalog✗/.well-known/api-catalog
OpenAPI document✗/api/schema/, /openapi.json, /swagger.json, /api/openapi.json, or /v1/openapi.json
MCP server card✗/.well-known/mcp/server-card.json
OAuth protected resource✓https://substack.com/.well-known/oauth-protected-resource
Agent card✗/.well-known/agent-card.json
Agent skills✗/.well-known/agent-skills/index.json

Publish these signals → /publishing