Stablecoins aren’t just crypto anymore: $400B in 2025 payments has banks on edge

Payment volume is now a bank-balance-sheet issue

Stablecoins were built into crypto as cash-equivalent settlement: quote currency, exchange transfer rail, volatility buffer. The reported 2025 payment figure changes the frame. The flow is now being compared with bank rails, not only with crypto market depth.

The operating contrast is clear:

• traditional cross-border payments still rely on correspondent banks, SWIFT messaging, and pre-funded nostro accounts;
• stablecoin transfers can settle continuously, without the same correspondent-bank chain;
• payment firms are integrating the rail rather than treating it as a crypto-only instrument.

The source material cites three relevant corporate moves: Mastercard agreed to buy BVNK for up to $1.8 billion; Visa’s stablecoin settlement volume reached a multi-billion-dollar annualized run rate by late 2025; Stripe incorporated Bridge into its payment stack.

This does not make stablecoins banks. They do not provide credit creation, lending, or deposit insurance. The pressure point is narrower: payment settlement and the custody of fiat-equivalent reserves.

One metric matters for banks: only 15% of every $1,000 converted into USDC or USDT reportedly returns to banks as reserves. That is the collateralization problem from the banking side. Tokenized bank deposits are estimated at about $4 trillion in yearly transfers, versus about $400 billion for stablecoin payments in 2025, according to the same report citing McKinsey. The scale gap remains large. The direction of competition is still material.

Regulation is adjusting, but caps still define the perimeter

The Bank of England has reportedly relaxed parts of its planned stablecoin restrictions, including removal of individual ownership caps and lower reserve requirements. The same reporting says a £40 billion issuance limit remains in view for sterling stablecoins.

That matters because the constraint is not only consumer exposure. It is infrastructure capacity. If demand is driven by cross-border payments, a domestic issuance cap can keep a local stablecoin market below operational scale while dollar stablecoins continue to process remittance and business flows elsewhere.

The Bank for International Settlements has also framed broad stablecoin adoption as a policy challenge across credit provision and monetary policy. That is the correct institutional lens. Stablecoins compete most directly with weak payment plumbing, but their reserve mechanics touch bank funding and central-bank transmission.

For USDT users, the regulatory read-through is simple. Jurisdictions are not blocking the rail uniformly. They are trying to define who can issue, how reserves are held, and how large the system can become before it affects deposit funding.

On-chain liquidity is contracting at the same time

The payments narrative is running against a softer market-cap tape.

CoinDesk reported that the stablecoin market saw a $7.7 billion decline in June, the largest dollar drop since May 2022. Total stablecoin supply has fallen by roughly $10 billion from its May peak, according to data cited in that report. The percentage move is about 3%, far below the 2022 contraction, but it is still the largest downtrend since 2023.

The issuer-level delta is concentrated:

• USDT market capitalization fell to roughly $184 billion from $190 billion in May;
• USDC declined to around $73 billion from just under $80 billion at its March 2026 peak;
• the broader stablecoin market has largely stalled around $300 billion since October.

That is the practical contradiction: payment use is expanding, while crypto-native liquidity has recently drained. Stablecoins can grow as settlement infrastructure and still contract as exchange collateral. Those are different balance-sheet functions.

A separate snippet from Pluang says USDT dominates stablecoin liquidity as Binance reserves shift from USDC to USDT. Without full source text, that should be treated as a directional market note, not a quantified reserve audit. Still, it fits the current structure: USDT remains the primary liquidity instrument even during supply contraction.

What to monitor now is mechanical, not rhetorical: USDT supply changes, exchange reserve composition, redemption flows, and reserve attestation cadence. The systemic impact is neutral but significant. Stablecoins are not replacing banks wholesale. They are isolating one bank function — cross-border settlement — and forcing the rest of the financial stack to account for the collateral.