The comment period for FinCEN and OFAC's proposed permissible payment stablecoin issuer (PPSI) rules closed June 9, 2026, marking a regulatory milestone for an industry where supply has ballooned to roughly $315–320 billion — but actual payments usage remains stubbornly low. Despite the massive float, most stablecoin supply sits idle on exchanges, in custody, or in smart contracts, with adjusted transfer volumes relative to supply offering a clearer — and less flattering — picture of real-world adoption.
The gap between supply and usage
USDT still dominates at 59.17% of the stablecoin market, while USDC's market cap sits at $74.841 billion as of June. Combined, the two tokens account for the vast majority of the $315–320 billion circulating supply. Yet raw on-chain transfer data is noisy; a better measure is adjusted transfer volume relative to supply, and by that metric, velocity is low. Crypto card volumes reached about $747 million in May 2026 — up 48.6% year-to-date — but that growth is dwarfed by the supply expansion of just 3.2% over the same period. Tokenized real-world assets have hit roughly $34 billion, but that's still a fraction of the stablecoin total.
Why merchants are slow to adopt
Merchants face real friction. Fees, finality times, wallet UX, and the need to bridge across chains all add cost and complexity. Compliance uncertainty has also slowed rollouts — retailers want to know exactly who they're dealing with and what the rules are before they integrate stablecoin payments. That's where PPSI comes in.
What PPSI aims to change
The proposed rule from FinCEN and OFAC would set baseline compliance controls for permitted payment stablecoin issuers. The comment period ended this month, and the agencies are now expected to review feedback before publishing a final rule. If adopted, PPSI could standardize know-your-customer, sanctions screening, and reporting requirements — giving merchants and payment processors the regulatory clarity they've been waiting for. Until then, the $315 billion question remains: when will the supply actually start moving?
