TL;DR: The case study referenced more than $42 million of net settled payments and over 448,000 payments on the underlying Commerce Payments Protocol dashboard as of October 2. Retail adoption should be judged by participating merchants, transaction completion rates, actual purchase demand and the payout experience. Base published a Shopify case study on October 29 describing how Shopify and Coinbase built a Commerce Payments Protocol that lets eligible merchants accept USDC through Shopify Payments. Under the design, customers pay with a dollar stablecoin while merchants may receive payouts in their local currency. What was announced The central evidence comes from Shopify and Coinbase’s own disclosure concerning Shopify’s Base-based USDC checkout model.