Proof Inbox MCP

Public listing for Proof Inbox: prepaid email-verify credits for MCP agents (Grok Bot, Cursor, Claude, and any Streamable HTTP client).

• Install: https://proofinbox.com/connect

• Grok Bot form: https://proofinbox.com/grok-bot

• MCP: https://mcp.proofinbox.com/mcp

• Registry: com.proofinbox/verify

• Smithery: https://smithery.ai/servers/proofinbox/verify

• cursor.directory: https://cursor.directory/plugins/proof-inbox

• Checkout: https://proofinbox.com/buy/verify-500 — $9 / 500 credits

The product app stays in a private repo. This repo exists so directories that scrape GitHub can find the hosted MCP.

Any MCP client

Point a Streamable HTTP client at https://mcp.proofinbox.com/mcp.

URL:      https://mcp.proofinbox.com/mcp
Headers:  Authorization: Bearer <workspace_token>

Get the token from checkout. Reuse it. Never invent one.

Related MCP server: InboxValid MCP Server

Grok Bot

Settings → Plugins → add a custom MCP server (not the Marketplace catalog).

Name:     Proof Inbox
URL:      https://mcp.proofinbox.com/mcp
Headers:  Authorization: Bearer <workspace_token>

Get the token from checkout. Reuse it. Never invent one.

Tools

• balance — tank check. Costs 0.

• verify_email — fresh check costs 1. Cache (30 days), syntax, and vendor unknown cost 0.

• receipts — checkout session id. Do not invent it.

On payment_required, open the returned checkout_url.

Directories

• Smithery — live as proofinbox/verify

• cursor.directory — live as proof-inbox