402MCP.org — HTTP 402 & Agent Payment Registry for ChatGPT

org.402mcp/registry

Decode HTTP 402 challenges (L402, x402, MPP) and choose agent payment rails from an open registry.

client:ChatGPT transport:streamable-http runtime:npm tools:7

Install 402MCP.org — HTTP 402 & Agent Payment Registry in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://402mcp.org/api/v1/mcp

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