Allowance MCP for ChatGPT

com.useallowance/allowance-mcp

Secure agent purchasing with human-approved virtual cards, receipts, and audit trails.

client:ChatGPT transport:streamable-http

Install Allowance MCP in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.useallowance.com

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