Why US Banks Are Lobbying to Block Interest-Bearing Stablecoins

3633) — language that could let payment stablecoins pay interest-like rewards to holders, according to a joint coalition letter reported by Crypto Briefing. The lobby cites Treasury estimates that up to $6.6 trillion in deposits could migrate to yield-bearing stablecoins if the loophole stays open, a figure that would hit community-bank lending capacity far harder than aggregate lending volume suggests. The ABA's chief economist, Sayee Srinivasan, and VP for banking research, Yikai Wang, dismissed a separate White House Council of Economic Advisers paper — which pegged the lending boost from a yield ban at just $2.1 billion, roughly 0.02% — as asking the wrong question.

The Funding Cost Curve

The asymmetry isn't aggregate lending; it's the shape of smaller institutions' marginal funding cost. Large banks pivot to wholesale markets when deposits flow out. Community banks and credit unions can't, so their cost of funds rises non-linearly and the loan books tied to those deposits — local mortgages, small-business credit — compress first. Coinbase CEO Brian Armstrong has run the counter-argument: banks have paid near-zero on deposits for decades, and stablecoin yield simply forces repricing. Both readings are technically correct. The policy fight is about whose balance sheet absorbs the redistribution — and whether smaller lenders have the flexibility to absorb any of it.

Knock-On Effects for Yield Strategies

The GENIUS Act, enacted in July 2025, already bars insured depositories from issuing stablecoins and treats them as non-deposits. The CLARITY Act fight is narrower but more consequential for anyone pricing USDC or USDT as a yield-bearing reserve: whether non-bank issuers like Circle and Tether can offer yield, rewards, or interest-like inducements at all. A hard ban turns payment stablecoins back into pure settlement instruments, which matters for products like the Coinbase USD Stablecoin Yield Fund share class that went live on Solana on July 28, 2026, and for any DeFi strategy routing through lending markets where stablecoin reserves are treated as productive capital. On-chain lending rates are still set by utilization mechanics, not legislative permission, but spreads should widen as the compliant float shrinks relative to offshore issuance and compliance arbitrage narrows.

What to Track

Three signals matter. The language of any Senate amendment to H.R. 3633 — the coalition letter targets "yield, rewards, or other interest-like inducements," broad enough to capture staking-style rewards, not just coupons. Circle's product roadmap: USDC's differentiation against USDT has leaned on yield-adjacent utilities, so a ban compresses its main lever. And the actual stablecoin float — the $6.6 trillion figure is a Treasury scenario, not a base case, but even a fraction of that flow reshapes liquidity depth across CEX and DeFi venues. Watch the Senate markup window; it's open now and narrowing.