E-commerce operators face a persistent threat: fraudulent orders placed with disposable and temporary email addresses. These transactions drive chargebacks, erode margins, and enable abuse of promotional offers. Fraudsters routinely use throwaway inboxes to create accounts, claim discounts, and place orders they never intend to fulfill—or worse, to test stolen payment credentials before scaling attacks. The financial impact is significant: chargeback fees, lost merchandise, and damaged merchant accounts with payment processors. For store owners running promotions, disposable emails can drain marketing budgets as fake signups consume limited-time offers without converting to real customers.
The challenge is timing. By the time a chargeback arrives weeks later, the damage is done. Traditional fraud signals—IP geolocation, device fingerprinting, velocity checks—help, but they miss the simplest and most reliable indicator: the email address itself. Disposable and temporary email providers are designed for anonymity. When a customer uses an address from a known disposable domain, that signal alone correlates strongly with fraud and abuse. Catching it at checkout, before payment is processed, is the most cost-effective defense.
Emailyze provides real-time disposable email detection at the critical moment—before the order is completed. By checking the customer's email address against a database of 30,000+ known disposable, temporary, and masked domains, you can block high-risk transactions or route them for manual review. The API returns structured signals—including is_disposable, risk_score, and provider_type—so you can enforce policies that match your risk tolerance. A single API call adds milliseconds to checkout; the ROI comes from preventing chargebacks and reducing abuse.
You can integrate Emailyze in two primary ways. For custom storefronts or headless commerce, use the REST API directly at checkout. When the customer enters their email, your backend calls the single-check endpoint before processing payment:
curl -H "X-API-Key: YOUR_API_KEY" \
"https://api.emailyze.xyz/v1/check/?email=customer@tempmail.com"The response includes is_disposable, risk_score (0–100), and provider_type (disposable, personal, freemail, masked, unknown). Use these to decide whether to block, warn, or allow the order.
For Shopify stores, the Emailyze Shopify app integrates via webhooks. It subscribes to customers/create, checkouts/create, and orders/create, so every new customer and order is evaluated automatically. You configure rules in the app dashboard: block orders from disposable emails, warn on medium-risk scores, or tag for review. No custom code is required; the app handles the API calls and enforcement.
The API returns several signals that inform your decision:
disposable, personal, freemail, masked, or unknown. Helps distinguish between throwaway addresses and legitimate privacy tools (e.g., Apple Hide My Email).Example response:
{
"email": "buyer@tempmail.com",
"domain": "tempmail.com",
"is_disposable": true,
"risk_score": 92,
"provider_type": "disposable"
}Your policy can be as strict or lenient as your business needs. Common approaches:
is_disposable is true or risk_score ≥ 80. Best for high-fraud categories.The Shopify app supports all three modes. For API integrations, you implement the logic in your checkout flow based on the response.
Merchants who implement email verification at checkout typically see chargeback rates drop within the first billing cycle. The reason is straightforward: fraudsters who rely on disposable emails are filtered out before payment authorization. Even when you choose to warn rather than block, the friction of requesting a different email deters many low-effort abusers. For promotional campaigns, cleaning signup lists before sending discount codes prevents one-time-use abuse and ensures offers reach genuine customers. The cost of a few API calls per checkout is negligible compared to the cost of a single chargeback—which often includes the transaction amount, chargeback fee, and lost merchandise.
The Emailyze Shopify app uses webhooks to evaluate every new customer and order. When a customer is created (customers/create), a checkout is initiated (checkouts/create), or an order is placed (orders/create), the app receives the event, extracts the email, calls the Emailyze API, and applies your configured rules. You choose the action per rule: block the order, show a warning, or tag for review. Rules can target is_disposable, risk_score thresholds, or provider_type. The app runs in the background; no customer-facing delay. For stores already on Shopify, this is the fastest path to checkout protection.
For API integrations, call the check endpoint as early as possible in the checkout flow—ideally when the customer first enters their email, before they proceed to payment details. Cache results per session to avoid duplicate calls if the user navigates back. For high-traffic stores, consider batching: collect emails from multiple checkouts and run a batch check periodically, then apply results to in-progress sessions. Always handle API errors gracefully; if the check fails, decide whether to allow the order (fail-open) or require manual review (fail-closed) based on your risk posture. Document your policy internally so support and fraud teams understand why certain orders are blocked or flagged. Track metrics—chargeback rate, blocked order volume, support tickets—to validate that your thresholds are calibrated correctly. Adjust as needed based on seasonal fraud patterns and new abuse tactics.
Reduce chargebacks and promo abuse by verifying emails at checkout. Install the [Emailyze Shopify app](https://apps.shopify.com/emailyze) for automatic webhook-based checks, or integrate the [API](https://docs.emailyze.xyz) into your custom storefront. Start with a single-check call before payment; scale to batch verification for order imports and list hygiene.