Every fraud check your signup and billing flows need
Email validation, IP intelligence, geolocation, and Stripe chargeback prevention. One API call, one risk score, under 200ms.
Catch bad email addresses
RFC-compliant syntax checking, domain verification, disposable email detection, and custom blocklists.
Block bad IP addresses
Detect VPNs, proxies, Tor nodes, and problematic ISPs. Real-time geolocation with location matching.
Prevent chargebacks
Score every Stripe payment as it completes and refund the risky ones before they become disputes, fees, and processor scrutiny.
Score each action
Weighted algorithm with configurable risk weights and severity levels. Human-readable risk messages.
Build your own blocklists
Manage your own blocklists with severity levels. Share entries across accounts or keep them private.
Built for developers
REST API with copy-paste code samples. 5 lines of code and you're live in minutes, not sprint cycles.
$362B+
Projected merchant losses to online payment fraud between 2023 and 2028. (Source: Juniper Research)
1 in 8
Form signups use a disposable email address. See the 2026 data. (Source: EmailListVerify, 2026)
Email Validation
Catch invalid, disposable, and blocklisted addresses before they ever reach your database. Try it live with the free email checker.
- RFC-compliant syntax validation
- MX and DNS record verification
- Disposable email detection
- Custom email and domain blocklists
POST /api/validate
{
"email": "user@example.com"
}
Response:
{
"risk_score": 15,
"risk_message": "LOW RISK",
"data": {
"checks": {
"invalid_email": false,
"disposable_email": false
}
}
}POST /api/validate
{
"ip": "203.0.113.7",
"country_code": "US"
}
Response:
{
"risk_score": 45,
"risk_message": "MODERATE RISK - VPN detected,
location mismatch",
"data": {
"checks": {
"vpn": true,
"proxy": false,
"tor": false,
"location_match": false
},
"location": {
"country_code": "NL",
"city": "Amsterdam"
}
}
}IP Analysis
Know when a signup is hiding behind a VPN, proxy, Tor, or a datacenter before you trust it. Test any address with the VPN detector.
- VPN, proxy, and Tor detection
- Real-time geolocation lookup
- Location matching and verification
- ISP reputation checking
Stripe Chargeback Prevention
Score every completed payment and refund the risky ones before they turn into disputes that count against Visa's 2026 VAMP thresholds.
- Real-time transaction analysis
- 25+ risk factors evaluated
- Same card detected across multiple accounts
- Intelligent refund recommendations
- Complete audit trail
Webhook: payment_intent.succeeded
{
"risk_score": 78,
"recommendation": "refund",
"risk_message": "HIGH RISK - Multiple red flags"
}Frequently Asked Questions
What types of fraud does Fidro detect?
Fidro detects disposable and temporary email addresses, VPN and proxy usage, Tor exit nodes, datacenter IPs, suspicious ISPs, geolocation mismatches, and high-risk Stripe transactions. All checks run in a single API call and return a unified risk score.
How does Fidro's email validation work?
Fidro performs RFC-compliant syntax validation, MX and DNS record verification, disposable email domain detection against a database of 50,000+ known domains, and custom blocklist matching. Results are returned in under 200ms.
How does Fidro prevent Stripe chargebacks?
Fidro evaluates 25+ risk factors on each Stripe transaction including email reputation, IP intelligence, geolocation matching, transaction velocity, and card fingerprint tracking that catches the same card used across multiple customer accounts. High-risk transactions receive an automatic refund recommendation before a chargeback can be filed.
How fast is Fidro's API?
Fidro's API responds in under 200ms on average, making it suitable for real-time validation during signup flows and payment processing without adding noticeable latency.
Start catching bad signups in the next 5 minutes
Create your account, grab your API key, and send your first request. Free plan with 200 validations/month. No credit card. Cancel anytime.
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