LLM Margin for ChatGPT

io.github.biserd/llm-margin

Estimate AI service costs, setup fees, monthly retainers, overages, and gross margin.

client:ChatGPT transport:streamable-http tools:1

Install LLM Margin in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://llmmargin.com/mcp

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