The blog

Articles from Promo Code Index on how discount codes and coupon sites work, some drawn from the offer history we record from our partners’ feeds.

• Why discount codes disappear from coupon sitesA discount code doesn't vanish at random. It leaves our listings in one of four recorded ways, sometimes because it left the store's feed and sometimes because our own rules retired it. Our sync ledger shows which is most common.Published September 24, 2026