Stop fraud at signup,
not after the chargeback
One API call checks the email, IP, and geolocation of every signup and Stripe payment — then tells you whether to allow, review, or block. Free plan, no credit card.
No credit card required with our always-free plan.
Try it — validate any email in seconds
See what Fidro returns for any email address, or use our full email checker tool for more detail.
Free demo limited to 1 request per 30 seconds per IP. Previously tested emails are cached for 24 hours. Sign up to start on the free plan with 200 validations/month.
Bad signups and risky payments slow you down
Disposable emails, fake accounts, and stolen cards pollute your product, skew your metrics, and create expensive chargebacks.
- Free tiers get abused by throwaway emails and automated signups.
- Support and product teams waste time dealing with spam accounts and bad data.
- Chargebacks and bank disputes eat into revenue and can get your merchant account suspended.
The average chargeback costs merchants $190 in fees and lost revenue — and chargeback rates above 1% can trigger monitoring programs from card networks. (Source: Chargebacks911, 2024)
One API call in your signup or checkout
Add one API call to your signup and Stripe payment flows to get a single risk score and recommendation you can act on in code.
- Validate emails, IPs, and geolocation on every signup.
- Score Stripe transactions with chargeback-focused risk checks.
- Use human-readable risk messages to decide whether to allow, review, or block.
What is Fidro?
Fidro is a developer-first fraud detection API that combines email validation, IP intelligence, geolocation analysis, and Stripe chargeback prevention into a single risk score and recommendation. Instead of stitching together multiple services or building your own scoring logic, teams add one API call to their signup and payment flows to catch disposable emails, risky IPs, and high-risk transactions.
1,000+
Disposable email domains tracked and updated daily
14+
Risk factors evaluated per Stripe transaction
< 200ms
Average API response time for real-time validation
Live today
—
API calls today
—
Emails validated
—
Risks detected
—
Requests right now
Replace 4 services with one API call
Stop stitching together email validation, IP lookup, geolocation, and chargeback tools. Fidro runs all four checks in a single request.
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.
Protect your reputation
Automatic chargeback prevention with real-time transaction analysis and intelligent refund recommendations.
Risk score every signup
Every signup gets a 0–100 risk score with a clear allow/review/block recommendation you can act on in code.
Build your own blocklists
Block specific emails, domains, or IPs you've seen before. Build once, apply across all your apps.
Built for developers
REST API with copy-paste code samples. Most teams integrate in under an hour.
How It Works
Get started in minutes with our simple integration
Sign Up
Create your account and get your API key in seconds. Start on the free plan—no credit card required.
Integrate
Add one API call to your signup form or Stripe webhook. Copy the code from our docs — it's 5 lines.
Protect
Each request returns a risk score and a plain-English recommendation: allow, review, or block.
Teams using Fidro see cleaner user lists, fewer support tickets from fake accounts, and chargebacks caught before they hit your Stripe dashboard.
What bad signups and chargebacks actually cost
Most teams underestimate the real cost of not validating signups and payments.
$190
Per chargeback
Lost product, fees, penalties, and operational costs per dispute. Just 10 chargebacks/month = $1,900 lost.
30%+
Fake trial signups
Of free trial signups can be disposable or fake emails. That's wasted infrastructure, skewed metrics, and inflated user counts.
1%
Chargeback threshold
Exceed 1% chargeback rate and Visa/Mastercard put you in monitoring programs with fines up to $25,000/month.
Fidro's free plan catches these problems for $0. Paid plans start at less than the cost of a single chargeback.
Start free, scale as you grow
Start with the free developer plan, then upgrade only when your volume and fraud needs grow. All plans include our core fraud detection features.
Free
- 200 validations/month
- Email, IP & geolocation checks
- Risk scoring
- GitHub Issues support
Starter
That's $0.97/day
- 5,000 validations/month
- Custom blocklists
- Webhook callbacks
- Email support
Pro
That's $6.63/day
- 50,000 validations/month
- Stripe chargeback prevention
- Risk trend dashboard
- Priority email support
Enterprise
- Custom validations
- Dedicated account manager
- Custom risk weights
- SLA guarantee
All plans include full email, IP, and geolocation checks. Upgrade or downgrade anytime — no contracts, no lock-in.
Fidro never stores the emails or IPs you validate. Data is processed in real-time and discarded.
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.
Get Started Free