All Use Cases

Free Tier Abuse Prevention

Stop users from creating multiple accounts to abuse your free tier. Detect account farming, disposable emails, and VPN-based abuse patterns.

What is Fidro?

Fidro is a fraud detection API that combines email validation, IP intelligence, geolocation analysis, and Stripe chargeback prevention in a single API call. Built for developers at startups and growing companies, Fidro returns a risk score with a clear recommendation — allow, review, or block — so you can stop fraud without building your own scoring logic. Fidro offers a free plan with 1,000 validations per month, no credit card required.

The Problem

Serial abusers create dozens of accounts using disposable emails and VPNs to endlessly exploit your free tier. This costs real money in infrastructure and support while generating zero revenue.

The Fidro Solution

Fidro detects disposable emails, flags VPN/proxy usage, and identifies patterns that indicate multi-account abuse. Enforce your free tier limits without punishing legitimate users.

Key Features

Multi-Account Detection

Flag users creating multiple accounts from the same IP range or using disposable email patterns.

VPN & Proxy Detection

Identify signups attempting to mask their true location to circumvent geographic or account limits.

Custom Blocklists

Build and maintain your own blocklists of domains, emails, and IPs known to abuse your service.

200K+
Disposable domains
Real-time
Detection speed
Custom
Rules engine

Learn more about Fidro

Explore our features, see how we compare, or try Fidro for free.

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Frequently Asked Questions

How do I stop users from abusing my free plan?
Fidro detects patterns that indicate free tier abuse: disposable emails, VPN/proxy usage for location masking, and multiple accounts from the same IP range. Validate signups with Fidro's API to catch serial abusers before they enter your system.
How do people abuse free tiers?
Common tactics include creating multiple accounts with disposable emails, using VPNs to appear as different users, and scripting automated signups. Fidro detects all of these patterns through email validation, IP intelligence, and risk scoring.
Can I build custom blocklists with Fidro?
Yes, Fidro supports custom blocklists for domains, email addresses, and IP ranges. You can block specific email providers or IP ranges that you've identified as abuse sources, in addition to Fidro's built-in disposable email detection.
Will Fidro block legitimate users?
Fidro provides a risk score with a recommendation, not a binary block. You control the threshold and can route medium-risk signups to manual review rather than blocking them outright, minimizing false positives.

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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