PNC's USDC pilot with Coinbase embeds stablecoin settlement directly into a Tier 1 bank's corporate treasury rails, forcing other issuer processors and correspondent banks to decide whether stablecoin receipt is now a table-stakes treasury feature rather than an experimental offering. The structural pressure lands on corporate payment operations teams who set bank selection criteria — and on the networks and processors whose interchange and float economics depend on those flows staying inside traditional card and ACH rails.