Stop Chargeback Fraud, Card Testing & Friendly Fraud
E-commerce fraud has moved beyond stolen cards. Coordinated fraud rings use residential proxies to look like real customers until the chargebacks hit. Sentinel catches them before checkout.
What E-Commerce platforms face in 2026
Friendly fraud & chargeback rings
Coordinated groups of accounts use residential proxies to appear as unrelated customers, make purchases, then dispute them all simultaneously. Stripe Radar and IPQS see 400 different "real" users — Sentinel links them to one device cluster.
Card testing at scale
Bots test stolen card numbers with micro-transactions across your checkout flow. Each bot rotates IPs and device fingerprints — but behavioral and device signals expose the automation.
Account takeover & loyalty point theft
Credential stuffing bots take over customer accounts to steal loyalty points, gift card balances, and saved payment methods.
Promo & coupon abuse
Automated accounts claim single-use promo codes repeatedly, rotating emails, devices, and proxies to bypass per-account limits.
What Sentinel does for you
- Cluster coordinated fraud rings by device fingerprint before checkout
- Detect card testing bots via behavioral and device signals
- Stop account takeover without adding login friction
- Identify proxy-masked promo abuse across multiple "accounts"
- Integrate in 5 minutes — works alongside Stripe, Shopify, WooCommerce
saved in 90 days by an e-commerce brand catching a coordinated chargeback ring
[ Read Full Case Study ]Where the check goes
The two call sites that pay for themselves fastest: checkout (before the payment request leaves your server) and account creation. Screening the session before your payment gateway sees the card keeps card-testing bots out of your authorization rate, your fraud score with the acquirer, and your per-attempt fees.
// Screen the session before the card ever reaches your PSP
const res = await fetch('https://sntlhq.com/v1/evaluate', {
method: 'POST',
headers: {
'Authorization': 'Bearer ' + process.env.SENTINEL_KEY,
'Content-Type': 'application/json'
},
body: JSON.stringify({ token: req.body.sentinel_token })
});
const risk = await res.json();
if (risk.decision === 'block') return res.status(403).json({ error: 'Order blocked' });
if (risk.decision === 'review') flagForReview(risk.reasons);The signals that matter for e-commerce
Card testing before the gateway. Carders validate stolen card lists against real checkouts using residential proxies and randomized timing — from the network side each attempt looks like a new shopper. The tell is the device layer: automation artifacts, spoofed fingerprints, and the same hardware reappearing behind "different" customers. Catching that before the authorization request is the difference between a blocked bot and a fraud-score problem with your acquirer.
Guest checkout isn't anonymous to the device graph. Serial refund abusers and coupon farmers rotate emails and use guest checkout to look like first-time buyers. Hardware-level identity ties those sessions together across weeks, without requiring accounts or cookies that privacy tools clear.
Checkout automation with stealth patches. Sneaker-drop and inventory-hoarding bots run Playwright and Puppeteer behind residential IPs that pass every network check. The device integrity signals — headless artifacts, input timing, environment tampering — are where they stay visible.
Layered mismatch beats single signals. Any one of billing country, IP geolocation, browser timezone, and shipping address can innocently disagree. Sentinel scores the disagreement pattern rather than any single field, which is why false positives stay low while layered fraud stands out.
Common questions
Start protecting your e-commerce platform
Free tier. 1,000 API requests per hour. No credit card. Detects residential proxies, antidetect browsers, and AI bots.