01
ALLOW
Keep the signup moving
No configured risk signal was found. Continue with your normal account flow.
Private beta / Email-first checks
Catch risky emails before account creation.
SignupBear checks disposable addresses and your own email rules, then returns a clear signal. Your application always makes the final decision.
Email-first APIExplainable resultsFail-open by design
REQUEST
POST /v1/checkemail: "hello@mailinator.com"RESPONSE
HIGH RISK
Disposable email domainRECOMMENDED ACTION
Review or block
One signal, three clear outcomes
Know what SignupBear found.
Read the reason, then apply the response that fits your signup policy.
02
REVIEW
Ask for one more signal
Something deserves attention. Add verification or route the signup for review.
03
BLOCK
Enforce your own policy
A disposable address or custom rule matched. Your application decides what happens next.
The decision path
One small check before account creation.
- 01
Send the email
Pass the address from your server-side signup handler.
- 02
Read the signal
Get an explainable risk level and a recommended action.
- 03
Choose what happens
Allow, flag, review, or block according to your own policy.
Designed for the moment of signup
Useful signals, not another black box.
Call one endpoint from your signup handler. The response explains what was found and recommends an action without enforcing it.
Read the integration guide01
Known disposable email domains
02
Optional plus-address detection
03
Your own domain and email blocklist
Live email check
See the signal before you integrate.
This rate-limited demo uses SignupBear's server-side endpoint. No reusable API key is shipped to your browser.
Demo requests are rate limited and are not added to a workspace activity log.
RESULThigh risk
hello@mailinator.comDisposable email domain. Recommended action: block.
View JSON response
{
"success": true,
"request_id": "demo-preview",
"status": "complete",
"risk_level": "high",
"recommended_action": "block",
"decision_source": "signupbear_policy",
"policy_version": "2026-07-beta-1",
"coverage": {
"email": "complete",
"ip": "not_requested"
},
"email": {
"address": "hello@mailinator.com",
"domain": "mailinator.com",
"disposable": true,
"subaddressed": false
},
"ip": null,
"reasons": [
{
"code": "DISPOSABLE_EMAIL_DOMAIN",
"message": "Disposable email domain"
}
]
}Frequently asked
The useful details, before you integrate.
SignupBear classifies the email address or domain you send to the API. It can detect known disposable domains, optional email subaddressing, and entries in your custom blocklist.
Private beta access