MCC Displayer

Display Merchant Category Code on payment and checkout pages

MCC Displayer shows you the Merchant Category Code (MCC) when you reach the payment step on checkout pages. MCCs are 4-digit codes that classify businesses by their primary activity - they determine how your credit card rewards are calculated, whether cashback applies, and how transactions appear on your statement. Why It Matters - Credit Card Rewards: Many cards offer bonus rewards for specific MCC categories (e.g., 3x points on dining, 5% back on groceries) - Expense Tracking: Know how your purchase will be categorized before you complete it - Business Expenses: Verify merchant classifications for expense reports and tax purposes Key Features Smart Detection - Automatically detects when you're on a payment step (card entry forms, saved payment methods) - Works with major payment providers including Stripe, PayPal, Square, Braintree, and Adyen - Supports single-page applications with real-time updates Intelligent MCC Resolution - Domain-specific rules for accurate classification - Flow-based detection for multi-purpose sites (e.g., distinguishes between flights vs. hotels on travel sites) - Heuristic fallback for unknown merchants Customizable - Set manual overrides for specific domains - Adjustable auto-close timer for the notification badge - Import/export rules for backup and sharing Privacy-Focused - All processing happens locally in your browser - No data is sent to external servers - No account required How It Works 1. Browse to any checkout page 2. When you reach the payment step, a badge appears showing the MCC 3. Hover over the badge for details (category, confidence level, detection source) 4. Click to access more options or dismiss Perfect For - Credit card rewards optimizers - Small business owners tracking expenses - Anyone curious about how merchants are classified