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SignupBear checks an email before you create an account and returns one explicit action: allow, review, or block.

Make your first check

Create a test key and call POST /v1/check.

Understand decisions

Learn how risk levels, actions, reasons, and policy versions fit together.

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The integration point

Call SignupBear from your backend immediately before account creation. Treat recommended_action as the stable policy output and keep request_id for support and audit trails.
Never put a SignupBear API key in browser code. Your signup endpoint should call SignupBear from a trusted server environment.

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Private beta scope

The current policy evaluates disposable email domains, subaddressing when enabled, and your custom email or domain blocklist. IP input is accepted but is reported as unavailable during private beta.

Private beta behavior

Use deterministic test addresses before sending production signup traffic.