JustOnce for ChatGPT

ai.justonce/memory

Persistent memory for AI assistants — one shared, OAuth-secured vault for every MCP client.

client:ChatGPT transport:streamable-http

Install JustOnce in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.justonce.ai

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