SignupBouncer

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "signupbouncer": {
      "type": "http",
      "url": "https://signupbouncer.com/mcp"
    }
  }
}

6 tools

• check_email

  Checks one email address, and optionally the signup's IP address, the way SignupBouncer checks a new signup. Returns the result as "verdict" (allow, challenge or block), a 0-100 score, the reasons with their reason codes, the normalized inbox (Gmail dots and +tags folded) and…

• explain_reason

  Explains a SignupBouncer reason code (for example disposable_domain, burner_mx, repeat_inbox, datacenter_ip): what it means, how many points it adds or whether it blocks alone, and the lowest plan on which it counts. Without a code, lists every code.

• lookup_burner_domain

  Says whether a domain is on SignupBouncer's disposable (burner) email list, only on an old burner list (a challenge, not a block), a known relay service or a free subdomain mail service, or a known real mailbox provider, and when our harvester observed it. Uses only the loaded…

• integration_guide

  Returns the steps and the copy-paste code that checks new signups with SignupBouncer in one stack: supabase (a hook, no code), ory (a web hook, no code), fetch (any TypeScript server), nextjs, express, hono, python, firebase or better-auth. Use it when the user is building or…

• get_rules

  Needs an API key. Returns the Rules settings of one of your apps: shadow or enforce mode, the challenge and block score cutoffs, what a challenge does in the Supabase and Ory hooks, the message a refused person sees, the "Why was this refused?" link, the velocity thresholds and…

• update_rules

  Needs an API key. Changes the Rules settings of one of your apps, which changes live signup blocking for that app: the next real signups are scored and refused under the new settings. Send only the settings to change. The others stay as they are. Setting mode to "enforce" starts…

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