Deal Methodology — How Dealrax Scores & Verifies Deals

A discount badge on its own doesn't tell you much — "40% off" is only meaningful relative to what something actually costs. This page explains, plainly, what Dealrax actually checks before showing you a price, what it can't check, and how its Buy Now / Wait verdict is calculated.

1. How a Discount Is Calculated

Every deal's percent-off is the poster's stated deal price against the poster's stated original price. Not every deal is a simple price cut, though: some are checkout-only discounts (the retailer never advertises a fixed sale price, so Dealrax doesn't show a fake one), some pair a price with a coupon code, and some are Featured Products with no discount claim at all. The page always labels which kind you're looking at.

2. Cross-Retailer Price Validation

Behind every deal is a validation pass that checks the claimed price against independent price data, where available, through a set of pluggable retailer integrations — currently including CheapShark for general retail price comparison, with more added over time as they're verified. When a lower verified price exists elsewhere, the page shows it directly, with a link.

3. Amazon Price History (Keepa)

For Amazon deals, Dealrax additionally reads up to a year of real historical pricing through Keepa, an independent Amazon analytics service. From that history it computes a verdict: lowest price ever, lowest in 90 days, verified deal, or discount may be overstated. This is Amazon-only — Keepa has no data for other retailers.

4. The Dealrax AI Verdict

The "Buy Now / Good Time to Buy / Wait" call shown on a deal page is a deterministic calculation — not a fresh AI-generated opinion on every page view — combining the price history verdict above (when available), the cross-retailer comparison, and the product's review rating as a separate quality caveat that never overrides the price call. When Dealrax genuinely doesn't have enough data yet, the verdict says so rather than guessing.

5. Deal Freshness & Expiration

Every validated deal shows exactly when it was last checked, along with a confidence level based on how many independent price sources actually responded. An expired or no-longer-valid deal is marked accordingly and drops out of the active deal feed.

6. Honest Limitations

• Not every retailer is cross-checked — the validation panel always shows exactly how many retailers were actually checked.
• Price history is Amazon-only — a non-Amazon deal's verdict relies on cross-retailer comparison alone, and says so explicitly.
• Prices change after validation — the "last checked" timestamp is a point-in-time check, not a live price feed.
• A high review rating and a good price are separate things; one never influences the other's calculation.

The bottom line

Always check the final price and availability on the retailer's own page before buying. See Deal Validation: How We Verify Offers and our buying guide for worked examples, or browse today's validated deals.