send21 for ChatGPT

io.github.send21io/mcp

Non-custodial payment drafts/pay links for BTC, USDC, USDT, EURC. Never holds keys.

client:ChatGPT transport:streamable-http tools:9

Install send21 in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://send21.io/mcp

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