MCP server

SignupBouncer Official

com.signupbouncer/checker

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

An API that checks new signups for disposable emails and repeat accounts.

Website

At a glance

Type

MCP server

Publisher

signupbouncer.com (verified by the MCP Registry)

Status

Working at last check

Tools

6

Token cost

About 2,475 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http checker https://signupbouncer.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.checker]
url = "https://signupbouncer.com/mcp"

Gemini CLI

{"mcpServers":{"checker":{"httpUrl":"https://signupbouncer.com/mcp"}}}

Cursor

{"mcpServers":{"checker":{"url":"https://signupbouncer.com/mcp"}}}

VS Code

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

Antigravity

agy mcp add checker https://signupbouncer.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"checker","server_url":"https://signupbouncer.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"checker","server_url":"https://signupbouncer.com/mcp"}

Tools

• check_email ~248 tokens
  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 normalised inbox (Gmail dots and +tags folded) and the IP's network. When
• explain_reason ~136 tokens
  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.
• get_rules ~234 tokens
  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 the setting of each c
• integration_guide ~218 tokens
  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 changing a signup, regi
• lookup_burner_domain ~195 tokens
  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 lists, no DNS lookup,
• update_rules ~1444 tokens
  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 refusing signups mar

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