SoFi Is Settling $25 Billion in Card Payments on a Blockchain

When a bank issues its own stablecoin, what does it actually settle?

Most coverage of bank stablecoins focuses on the coin: what backs it, which chain it runs on, whether it's FDIC-insured. The question that matters for payments infrastructure is different. What transactions does this thing actually clear?

SoFi just answered that. On September 22, SoFi Bank announced it's migrating its entire card program, debit and credit, to stablecoin settlement using SoFiUSD. Every card transaction processed through Mastercard's network now settles in a token SoFi Bank issues itself, running on Ethereum and Solana. The program processes $25 billion in annualized volume.

This is the first-party stablecoin path, live in production.

What moved on-chain

The cardholder experience didn't change. You tap your SoFi debit card at a coffee shop, Mastercard authorizes it, and the merchant sees a green checkmark. None of that touches a blockchain.

What changed is the settlement layer underneath. Traditional card settlement works on a batch cycle. Mastercard collects the day's transactions, nets them, and moves money between banks. That settlement runs on banking hours, banking days, and wire infrastructure that shuts down on weekends and holidays. A sale on Friday afternoon doesn't settle until Tuesday.

SoFi replaced that leg with SoFiUSD. Instead of waiting for a batch wire through Mastercard's settlement bank, SoFi settles in a token that moves on public blockchains around the clock. Authorization, clearing, and network messaging all stay on Mastercard's existing rails. Only the final money movement changed.

We covered how this layer works in the Mastercard plumbing series. The settlement step, where actual dollars move between issuer and acquirer, is the step stablecoins can replace without touching anything the cardholder or merchant sees at the register.

The merchant side

Merchants feel the difference even if they don't know why. Traditional card settlement means a merchant processes a sale on Monday and sees the funds on Wednesday. A Friday sale waits until Tuesday. Over a long weekend, the gap can stretch to four or five days.

Through SoFi's Big Business Banking platform, merchants receive settlement funds instantly in a SoFi Bank account and can withdraw to cash around the clock, at zero cost. For a business running tight on cash flow, instant access to yesterday's revenue changes how they plan the week.

But the merchant needs a SoFi Bank account to get instant settlement. SoFi is using stablecoin settlement as a distribution channel for its commercial banking platform. Faster settlement wins merchants, and merchants bring deposits.

SoFi is in active discussions with large US merchants, from multinational retailers to technology service platforms, about stablecoin settlement arrangements. The stablecoin is the product. The banking relationship is the business.

What SoFiUSD is and what it costs

SoFiUSD is not a deposit. The press release states this in bold: not insured by the FDIC or SIPC, not bank guaranteed, not legal tender, may lose value.

That distinction matters for the balance sheet. The three-paths analysis described the capital cost of a first-party stablecoin: the customer's claim converts from a deposit into a redemption contract against a segregated reserve pool. Under Basel SCO60, that shifts the liability from the cheapest funding category to the most expensive, a 100% LCR outflow and 0% ASF for NSFR.

SoFi accepted that trade. In return, it gets a 24/7 settlement asset on public, permissionless chains. The reserves consist primarily of cash held at the Federal Reserve, with monthly attestation reports from an independent accounting firm. Every SOFID token is redeemable 1:1 for US dollars.

The "public, permissionless" part distinguishes SoFi's approach from JPMorgan's. JPMD is a tokenized deposit on a permissioned network, movable only between vetted institutional wallets. SoFiUSD can move to any Ethereum or Solana address, any time, without SoFi's permission. Different products, different reach, different balance sheet costs.

Two paths, one bank

There's another detail on SoFi's product page, below the stablecoin FAQ. SoFi is also building tokenized deposits.

The planned product lets users convert SOFID to a tokenized deposit inside the SoFi app. The tokenized deposit would earn interest and be eligible for FDIC insurance. The stablecoin earns no interest and carries no insurance.

So SoFi is building two of the three architectures simultaneously. The stablecoin handles payments and settlement, where speed and 24/7 availability matter more than FDIC coverage. The tokenized deposit handles savings, where insurance and yield matter more than permissionless movement.

That's a product decision only a bank can make. Circle can issue USDC but can't offer an FDIC-insured tokenized deposit alongside it. Tether can't offer either. A nationally chartered bank can offer the full spectrum, from permissionless stablecoin to insured deposit, and let the customer choose based on what the money needs to do right now.

What follows $25 billion

SoFi and Mastercard are already exploring cross-border payments, remittances, and other money-movement use cases for SoFiUSD. Mastercard CFO Ling Hai said in September that stablecoin orchestration and white-label wallet capabilities are being embedded into Mastercard's payments stack.

We wrote about what Mastercard acquired with BVNK last month: the conversion layer between fiat and stablecoin rails. SoFi is the first bank to run production card volume through that infrastructure. The question is how many follow.

$25 billion in annualized card volume is the proof point. This isn't a pilot or a press release about future plans. A nationally chartered bank is settling its entire card program on a public blockchain, through the world's second-largest card network.

The first-party stablecoin path is no longer theoretical.