65% of users hold stablecoins for hours or days—foregone interest is negligible ($37 on $100K for 3 days). Another 12.5% earn yields elsewhere through DeFi. The 12.5% using stablecoins as store of value often can't access US money market funds. People who primarily value yield over speed already use traditional money market funds earning 4.5% with FDIC insurance. Stablecoin users self-select for transaction utility, which explains why PayPal's 3.7% interest hasn't captured market share.
Sources: Chainalysis 2025 Global Stablecoin Report, Coinbase Research on transaction patterns, Kaiko data on exchange activity, Stripe cross-border payment data. Usage percentages represent mid-range estimates from multiple data sources.