Stablecoins in card settlement: what correspondent banks stand to lose

On October 15, Visa Direct moved its stablecoin capability from pilot to production. Its first enabler, Inyo Global, prefunds cross-border payouts in USDC so they can settle in near real time. The same day, Mastercard-owned BVNK launched a platform connecting stablecoins to Mastercard's rails, with Nuvei and Marqeta as the first planned integrators. Stripe and Plasma announced multi-currency stablecoin cards that will start with direct euro spending, and Cross River embedded Ripple's RLUSD into its core banking system.

None of these products asks the merchant to change anything. The stablecoin sits in prefunding, in settlement or on the issuer's balance sheet. The consumer still taps a card, and the merchant is still paid in fiat.

Why it matters for institutions

Banks have mostly asked whether stablecoins would bypass card rails and the interchange that funds them. This week's launches point elsewhere. Networks are using stablecoins to repair the slowest parts of their own model, namely prefunded payout accounts and cross-border settlement windows. Those are exactly the places where correspondent and transaction banks earn their money.

The cost gap shows how much is at stake. At TBW's Paris Corporate Breakfast in June, participants put a $2 million Paris-to-Singapore transfer at around 3% through correspondent banks, against less than 1% onchain. At a TBW event in September, Hercle said its stablecoin route cuts a Europe-Nigeria payment from two or three days to about 13 minutes, while saving roughly 50 basis points against the interbank FX rate. Most of that difference is bank revenue today: correspondent fees, FX spread and the float earned on prefunded balances that sit idle for days.

A payments industry expert we spoke with explained why stablecoins slot into card settlement so easily. In a card model, the issuing and acquiring legs are already separate. An issuer can settle in USDC while the acquirer is paid in yen, so the stablecoin becomes one more settlement currency in the middle of the chain. In the expert's view, stablecoins suit the role because KYC access is relatively open, primary and secondary markets exist, and tokens can be minted and burned. Tokenized deposits stay inside individual banks, and wholesale CBDCs have yet to prove themselves as a settlement asset.

The same expert kept the scale in perspective. Citing consulting research published this year, they estimated that real-world payments account for well under 1% of stablecoin volume. Payments also remain local, and cards, Bizum, Alipay and cash will coexist with onchain money for years.

Distribution is moving faster than usage. In May, Corpay, which processes $12 billion of payments a month, partnered with BVNK to integrate stablecoin wallets for more than 800,000 corporate clients.

When balances move onchain, the float moves with them. On a stablecoin rail, the interest on idle money accrues to the issuer that holds the reserves, and USDC alone has about $72.5 billion in circulation (CoinGecko). Consortium stablecoins propose sharing that reserve income with the banks and payment firms that distribute them, and dropping mint and burn fees. The model is untested at scale. Concentration in a handful of issuers and blockchains also adds operational and counterparty risk that correspondent banking spreads across many parties.

The Big Whale's take

The card networks are treating stablecoins as a back-office upgrade, which is what incumbents with distribution usually do with a new technology. Card issuing and acquiring are not the business under threat. The exposure sits one layer down, with the banks that hold prefunding and correspondent balances and earn spread and float on them. When networks and PSPs prefund in stablecoins, those balances leave bank balance sheets.

Banks still have a way in without issuing a stablecoin. As issuers and acquirers, they can settle with networks in stablecoins and run smaller liquidity buffers. For corporate clients, they can act as the fiat on-ramp, keeping the KYC relationship and the conversion margin. A consortium stablecoin that shares reserve income would also let them recover part of the float through distribution. Banks that do none of this lose the balances and earn nothing on the new rails.

The demand is already there. At a recent TBW event, treasurers from a large corporate said they had asked their bank for a stablecoin solution on corridors they had already identified, and heard six months later that the bank could not help. Multinationals prefer to go through their own bank, but networks and PSPs are building the product now, so the window is short. The number to watch in these partnerships is how reserve income gets split, because that split decides who keeps the margin.