# Proof Inbox MCP

Public listing for [Proof Inbox](https://proofinbox.com): 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.

## 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](https://smithery.ai/servers/proofinbox/verify) — live as `proofinbox/verify`
- [cursor.directory](https://cursor.directory/plugins/proof-inbox) — live as `proof-inbox`