Verify Users at Signup to Reduce Churn
A single mistyped email or fake phone number can stop a user from ever activating. 1Lookup verifies email, phone, and IP at signup to cut churn, block abuse, and protect the data flowing into every downstream system.
<200ms
Signup risk decision
3-in-1
Email, phone & IP checks
34%
Lower churn from clean signups
Where onboarding breaks down
The moment of signup sets the trajectory for the whole customer relationship. Bad data at the start follows you everywhere.
Typos and fake details break activation
A mistyped email or fake phone number means verification messages never arrive — and the user churns before they ever activate.
The wrong amount of friction kills conversion
Heavy upfront verification frustrates good users, while too little lets fraud and junk accounts straight through.
Bad data poisons every downstream system
Unverified contact data flows into your CRM, billing, and support tools — corrupting analytics and inflating costs for months.
How 1Lookup verifies onboarding
Validate contact details and score risk in a single call at signup, then branch your onboarding flow on the result.
Validate contact details at the point of entry
Verify email syntax, deliverability, and disposable status, and confirm the phone is a live, reachable mobile — before the account is created.
Score signup risk with IP intelligence
Layer in proxy, VPN, Tor, and geolocation signals to separate genuine new users from fraud and abuse.
Branch the flow on risk
Send frictionless users straight to activation, prompt for correction on typos, and step up or block risky signups.
// Verify a new user across email, phone, and IP at signup
const res = await fetch('https://api.1lookup.io/v1/detect/fraud', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
email: 'new.user@example.com',
phone: '+14155552671',
ip: '203.0.113.42'
})
})
const { email_analysis, phone_analysis, ip_analysis, risk_level } = await res.json()
// Auto-approve clean signups, step up the risky ones
if (risk_level === 'low') {
// frictionless onboarding
}Products that power this
Mix and match the APIs you need. Each one works on its own or together in a single request.
Email Validation
Deliverability scoring and typo suggestions at the point of signup.
Phone Intelligence
Confirm a live, reachable mobile for SMS verification and outreach.
IP Intelligence
Proxy, VPN, Tor, and geolocation risk for every signup.
Frequently asked questions
How does verifying users at signup reduce churn?
Catching typos and fake contact details before the account is created ensures your verification and onboarding messages actually arrive, so users can activate — instead of silently dropping off after a failed email or SMS.
Which data does 1Lookup check during onboarding?
1Lookup validates email deliverability and disposable status, confirms the phone is a live reachable mobile, and analyzes the signup IP for proxy, VPN, Tor, and geolocation risk.
Will verification add friction for good users?
No. Checks return in under 200ms and run behind the scenes, so legitimate users pass straight through to activation while only risky or malformed signups are prompted for correction or step-up verification.
Can I suggest corrections for mistyped emails?
Yes. Email validation returns a typo suggestion (for example, gmial.com → gmail.com) so you can prompt the user to fix it before submitting.
How do I integrate signup verification?
Call the API from your signup handler with the user’s email, phone, and IP, then branch your flow on the response — approve, request a correction, or step up verification — all in a single request.
Onboard real users, frictionlessly
Verify email, phone, and IP at signup to reduce churn, block abuse, and keep clean data flowing into every downstream system.
No setup fees • 100 free validations • Cancel anytime