According to the source, Coinbase ended the waitlist for its Bitcoin rewards credit card, the Coinbase One Card, and opened access to U.S. users. Based on the source, this U.S. rollout establishes a new BTC rewards channel, so traders may monitor BTC rewards issuance and Coinbase app engagement as proxies for adoption. Given the source's report of broader access, traders may also track COIN trading volume and exchange BTC flow metrics for signs of incremental on-platform activity tied to rewards distribution.