SoFi Technologies and Mastercard said on 22 September 2026 that SoFi Bank’s entire debit and credit card program, which runs at more than $25 billion in annualised volume, had moved to blockchain settlement using SoFiUSD, the dollar stablecoin SoFi Bank issues under its national charter. The two companies first announced the partnership in March, so the move from press release to production took about six months.

Most bank-issued stablecoin projects have stayed in pilot, limited to a handful of corporate clients or a single corridor. SoFi put its whole card book on the new rail in one go. Whatever you think of stablecoins, a US national bank settling tens of billions of dollars of card transactions in a token it mints itself has not happened before.

What SoFiUSD settlement changes for the card program

Card settlement is the back-office leg of a card payment. A cardholder taps, the network authorises the transaction in seconds, and the money actually moves later between the issuing bank, the network and the acquirer, usually in batches tied to banking hours. Under the new arrangement SoFi Bank meets its obligations on Mastercard’s network in SoFiUSD rather than through the usual wire and ACH flows.

Cardholders will notice nothing. Their cards work the same way and their statements look the same. The change sits entirely between SoFi Bank and Mastercard, and that is why it could move so fast: nobody outside the two institutions had to change how they work.

According to the joint release on Business Wire, SoFiUSD is redeemable one for one in US dollars and backed by reserves held mainly in cash. It is not a deposit and carries no FDIC insurance, a point SoFi spells out in its SoFiUSD disclosures. Transactions went live on chain on 22 September.

The merchant side of the SoFiUSD pitch

The more interesting part of the announcement is aimed at merchants. SoFi says businesses on its Big Business Banking platform can receive card settlement funds instantly into a SoFi Bank account and withdraw to cash at any hour at no cost, without holding a stablecoin or building anything new. Chief executive Anthony Noto described it as “faster access to their money via the speed of blockchain, with the safeguards of a bank.”

Weekend settlement is a real cost for small merchants, who can wait until Tuesday for Friday night’s takings. If SoFi can give them same-hour access to card receipts for free, that is a stronger reason to open a business account than most rate offers. It also pulls merchant deposits into SoFi Bank, which is presumably the commercial point.

SoFi adds that it is in active talks with large US merchants, from multinational retailers to technology platforms, about settling directly in SoFiUSD. It named none of them. Until one signs, the $25 billion figure mostly describes SoFi moving its own money through its own token.

Why a bank-issued stablecoin matters to Mastercard

SoFi calls SoFiUSD the first stablecoin issued by a nationally chartered bank. For Mastercard that label carries weight. A network that settles with thousands of banks will find it far easier to accept a token from an OCC-supervised bank, subject to the same capital and liquidity rules as the rest of its liabilities, than a token from a crypto-native issuer.

The GENIUS Act, signed in July 2025, set out the federal framework for payment stablecoins, including a route for banks to issue them, and several large lenders have since tested tokens of their own. Fintechbits looked at one of those efforts in its piece on the US Bancorp stablecoin pilot. SoFi’s version is further along simply because it already carries live volume.

Mastercard, for its part, is collecting settlement options. Sherri Haymond, the network’s global head of digital commercialisation, said the goal is to give businesses “more choice in how money moves.” Other card programs are experimenting with stablecoins too, as our report on Marqeta and BVNK describes. The network does not much care which token wins, provided settlement still runs through it.

What SoFiUSD does not solve

SoFiUSD is useful to a merchant only if that merchant banks with SoFi, or trusts SoFi Bank enough to hold its token. Stablecoin settlement works neatly inside one bank’s perimeter. Between banks it needs either a shared token or dependable conversion between tokens, and the US has neither at scale. A merchant whose accounts sit at JPMorgan and Wells Fargo gets nothing from SoFi’s rail as it stands.

“Instant” also needs unpacking. A withdrawal to cash still has to leave SoFi over conventional rails, so the free, round-the-clock cash-out SoFi describes presumably runs over an instant payment network such as RTP or FedNow. The release does not say which, and the merchant experience depends on it.

The economics are harder to read. Like any stablecoin issuer, SoFi earns a return on the reserves behind its token, and routing $25 billion of annual card flow through SoFiUSD keeps that float on its balance sheet for longer. That is a perfectly sound business reason for the project. It is not the same thing as a benefit to merchants, and the release quantifies neither.

Our view on the SoFi and Mastercard launch

This is a substantial bank stablecoin deployment by any measure, because it runs in production, at volume, inside a regulated bank. It is also narrower than the headline suggests. The $25 billion is SoFi’s own card program and the settlement counterparty is a single network. The part that could change the wider market, outside merchants choosing to be paid in SoFiUSD, has not begun.

SoFi deserves credit for doing the unglamorous integration work that most banks have only presented at conferences. Bank-issued stablecoins will be judged on whether anyone outside the issuing bank uses them, and SoFi is the first to put itself in a position to be tested on that.

What to watch after the SoFi launch

Watch for the first named merchant settling in SoFiUSD. SoFi says it is talking to large retailers and technology platforms, and a signed multinational retailer would turn this from an internal treasury upgrade into a merchant product. The second signal is SoFi’s third-quarter 2026 results, due in late October, where management may disclose how much SoFiUSD is outstanding and how much of it sits outside SoFi’s own settlement flows.