Four fraud checks.
One API call.

Email, IP, VPN and domain risk, scored in a single request and returned as one decision: allow, review, or block.

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Free plan with 200 validations/month. No credit card required.

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Try it: check any email for fraud risk

See how Fidro scores an email address for risk. The full API also checks IP, geolocation, and Stripe payment data. Try our email checker or VPN detector for more.

Emails you test are checked in real time and never stored.

Fake signups and stolen cards are bleeding you dry

Disposable emails and VPNs let abusers create unlimited free accounts and drain your trial. The ones that reach checkout with a stolen card cost you the product, the revenue, and a $15-100 fee.

  • Under Visa's 2026 VAMP rules, dispute rates above 1.5% trigger $8-per-dispute fees and account reviews. Processors like Stripe enforce even tighter limits.
  • Stolen cards processed through Stripe become disputes you can't win and revenue you can't recover.
  • Disposable emails and VPNs let abusers create unlimited free accounts and exploit your trial.

The average chargeback costs merchants $190 in fees and lost revenue, and under Visa's 2026 VAMP rules excessive dispute rates trigger per-dispute fees and account reviews. (Source: Chargebacks911)

One API call. Every signal. One answer.

Add one request to your signup flow. Fidro checks the email, the IP, the network and the location, then returns a score from 0 to 100 with a clear allow, review or block recommendation.

  • Check email validity, disposable domains, VPNs, proxies, Tor and datacenter IPs in a single call.
  • Get one risk score with human-readable reasons your code can branch on.
  • And when the payment arrives, score it against 25+ chargeback risk factors too. 
POST /api/validate
{
  "email": "jd8842@tempmail.plus",
  "ip": "185.220.101.4"
}

Response:
{
  "risk_score": 87,
  "recommendation": "block",
  "risk_message": "HIGH RISK - Disposable email, VPN detected",
  "data": {
    "checks": {
      "disposable_email": true,
      "vpn_detected": true
    }
  }
}

What is Fidro?

Fidro is a fraud detection API for developers. A single request scores an email address and an IP against disposable-email, VPN, proxy, Tor, datacenter, blocklist and geolocation checks, and returns one risk score from 0 to 100 with an allow, review or block recommendation. Where single-signal vendors return one attribute and leave the judgement to you, Fidro returns a decision. It also scores Stripe transactions at payment time against 25+ risk factors, so one integration covers both signup fraud and chargebacks.

50,000+

Disposable email domains tracked and updated daily

25+

Risk factors evaluated per Stripe transaction

< 200ms

Average API response time for real-time validation

Live today

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API calls today

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Emails validated

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Risks detected

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Requests right now

Watch live activity →

Chargeback prevention, email validation, and IP intelligence in one API

Stop stitching together Stripe fraud tools, email validators, and IP lookup services. Fidro runs all checks in a single request and returns one risk score.

Refund high-risk payments before they become chargebacks

Fidro listens to your Stripe webhooks and scores every completed payment against 25+ chargeback risk factors: card-country mismatches, geolocation, disposable emails, transaction velocity, and the same card popping up across multiple accounts. High-risk charges get a refund recommendation while a refund is still just a refund, not a dispute counting against your VAMP ratio.

Already using Stripe Radar? Keep it. Radar scores the card at payment time. Fidro scores the email, IP, and signup behavior around it, then keeps watching after the charge. How Radar and Fidro fit together → 

Webhook: payment_intent.succeeded
{
  "risk_score": 78,
  "recommendation": "refund",
  "risk_message": "HIGH RISK - Disposable email, card
                   used across multiple accounts",
  "checks": {
    "disposable_email": true,
    "card_reuse": true,
    "high_value_transaction": true
  }
}

Risk score every signup

Every signup and payment gets a 0-100 score with an allow/review/block recommendation, so your code decides in one if statement instead of a manual review queue.

Block disposable emails

Detect 50,000+ disposable email domains at signup. Stop free tier abuse and fake accounts before they enter your system.

Detect VPNs and proxies

Flag VPNs, proxies, Tor nodes, and datacenter IPs. Match geolocation against billing address to catch mismatches.

Build your own blocklists

Block specific emails, domains, IPs, or card fingerprints you've seen before. Build once, apply across all your apps.

Built for developers

REST API with copy-paste code samples. 5 lines of code and you're live in minutes, not sprint cycles.

From API key to blocked fraud in three steps

No SDK to install, no webhook gymnastics. One REST call from any language.

1

Sign Up

Create your account and get your API key in seconds. Start on the free plan, no credit card required.

2

Integrate

Add one API call to your Stripe webhook or signup form. Copy the code from our docs. 5 lines to start catching fraud.

3

Protect

Each request returns a risk score and a plain-English recommendation: allow, review, or block.

Teams using Fidro catch fraudulent payments before they become chargebacks, keep disposable emails out of their user base, and stop free tier abuse at the source.

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.

1 in 8

Signups are disposable

12% of form signups use throwaway emails. That's wasted infrastructure, skewed metrics, and inflated user counts.

1.5%

Visa VAMP threshold

Cross Visa's 2026 VAMP threshold and every dispute costs $8 in fees. Stripe and other processors flag accounts well before that.

Fidro's free plan starts catching these problems for $0, today. No credit card, no sales call, no procurement cycle.

Start free, scale as you grow

The free plan covers testing and small apps. Paid plans start at $29/month, less than the cost of a single chargeback.

Free

$0 /month
  • 200 validations/month
  • Email, IP & geolocation checks
  • Risk scoring
  • GitHub Issues support
Get Started
Most Popular

Starter

$29 /month

That's $0.97/day

  • 5,000 validations/month
  • Custom blocklists
  • Webhook callbacks
  • Email support
Get Started

Pro

$199 /month

That's $6.63/day

  • 50,000 validations/month
  • Stripe chargeback prevention
  • Risk trend dashboard
  • Priority email support
Get Started

Enterprise

Custom
  • Custom validations
  • Dedicated account manager
  • Custom risk weights
  • SLA guarantee
Contact Sales

All plans include full email, IP, and geolocation checks. Upgrade or downgrade anytime. No contracts, no lock-in.

View detailed pricing →

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.

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