Authentication

Send the API key in the standard Authorization header:

Authorization: Bearer sg_test_replace_me

curl https://signupbear.com/v1/check \
  --request POST \
  --header "Authorization: Bearer $SIGNUPBEAR_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{"email":"low@signupbear.test"}'

Missing, malformed, revoked, or unknown keys return HTTP 401.

API keys grant access to the account’s checks and quota. Use them only from a trusted server environment.

Check signup riskEvaluate an email and receive an explicit policy decision.

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