Solo MCP by usefulapi for ChatGPT

io.usefulapi/solo

Read invoices, offers, payment status and the product catalog in Solo.

client:ChatGPT transport:streamable-http tools:7

Install Solo MCP by usefulapi in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://solo.usefulapi.io/mcp

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