Horizontal: tested MCP servers, agent cases, top apps for ChatGPT

one.horizontal/services

Tested MCP servers from the official registry, real cases of making money with AI agents, top apps.

client:ChatGPT transport:streamable-http tools:2

Install Horizontal: tested MCP servers, agent cases, top apps in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://horizontal.one/api/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs