SignupBouncer

Install

Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install connector/signupbouncer-com-checker

About

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools

5 read · 0 write · 1 delete

Secrets

None asked for

Install scripts

Nothing to install (hosted)

Runs as

Hosted (remote endpoint)

Tools (6)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

• check_emailCheck a signup email (and IP)read-only

  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 the domain looks like a typo of a big mail provider (gmial.com), "suggestion" holds the corrected address. Looks up the domain's mail servers live. Every reason is listed, including ones only paid plans count. Nothing sent is stored.

• explain_reasonExplain a reason coderead-only

  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_rulesRead an app's rulesread-only

  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 check. The context part lists your plan, the checks that need a higher plan, the values each check takes and the defaults. A key made for one app reads that app, so leave out "app". An older all-apps key needs "app".

• integration_guideCode to check signups in your stackread-only

  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, register or auth flow. The code reads the API key from SIGNUPBOUNCER_API_KEY. The call has a 1.5-second limit, and any failure lets the signup through.

• lookup_burner_domainLook up a burner domainread-only

  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, so a brand-new burner domain on a burner mail server is caught only by check_email. Accepts a domain or an email address.

• update_rulesChange an app's rulescan change or delete data

  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 marked block, and "shadow" stops refusing any. If one value is wrong, nothing changes and the answer says which. Returns the app's rules afterwards, with the settings that changed. Confirm the change with the user first. A key made for one app changes that app, so leave out "app". An older all-apps key…

Signals

Last release

Oct 16, 2026 (19 days ago)

Details

Registry name

com.signupbouncer/checker

Version

1.1.1

Auth

Auth not stated

License

License unknown

Website

signupbouncer.com/docs#mcp

First seen

Oct 24, 2026

Last checked

Oct 24, 2026

Source

Official MCP Registry