SoFi Bank began settling its debit and credit card transactions with its SoFiUSD stablecoin on Mastercard's global network on September 22, 2026, a program the company projects will process more than $25 billion in transactions annually. SoFi says the move makes it the first national bank in the United States to run live stablecoin settlement across Mastercard's network.

Cardholders will notice nothing about the change, which is by design. The consumer-facing authorization at the point of sale stays the same; the difference sits in the back office, where funds travel between the institutions after a purchase. That settlement leg now runs through SoFiUSD instead of conventional interbank rails.

SOFI shares climbed nearly 5% on the day of the announcement.

How does SoFiUSD settlement work?

Every card payment splits into two events. The first is the swipe, tap or online checkout the customer sees. The second, settlement, is when funds actually move between the issuing bank, the acquirer and the merchant's bank. SoFi has replaced that second step with a token transfer.

SoFiUSD is fully reserved and redeemable 1:1 for US dollars, with reserves held in cash or cash equivalents. The Office of the Comptroller of the Currency (OCC) regulates the token, anchoring it inside the federal banking framework.

One caveat matters for consumers: SoFiUSD is not FDIC-insured and does not carry the same protection as a standard bank deposit, even though a bank issues it and backs it with cash reserves.

The stablecoin lives on public blockchains, starting with Ethereum and Solana. That architecture allows settlement around the clock and supports programmable payments. Merchants never touch the token — they receive ordinary fiat currency on their end.

What does the $25 billion figure mean against $300 million in circulation?

The scale gap between the two headline numbers is wide but not directly comparable. At the end of Q2 2026, SoFiUSD had roughly $300 million in circulation, while the card program is projected to settle over $25 billion per year.

Circulation measures how many tokens exist at a given moment. Settlement volume measures how much value flows through them over a year. The same dollars can be used repeatedly, so a $300 million float can support settlement flows far larger than its own size.

Even so, $25 billion is a projection, not a track record. The program went live only on September 22, and the annual figure has no realized history behind it yet.

How did SoFi get here?

The launch builds on a sequence laid out over 2026. SoFi and Mastercard formed a strategic partnership in March 2026 to enable stablecoin settlement on Mastercard's network. Two months later, in May 2026, SoFiUSD became available to roughly 15 million SoFi app users, with the stated aim of faster, more efficient payment processing inside a regulated banking framework.

SoFi has also reported interest from large US merchants in possible partnerships. None of those arrangements has been detailed publicly.

What are the business consequences?

SoFi intends to monetize the infrastructure in two directions. It plans to offer stablecoin settlement services to other banks through Galileo, its technology platform, and to pursue direct arrangements with merchants.

The platform pitch remains a plan rather than a revenue line. No other bank has publicly committed to using Galileo for stablecoin settlement, so the business-to-business leg of the strategy has no signed customers on the record yet.

Consumer comprehension poses a second operational risk. Users holding SoFiUSD need to understand that the token, despite coming from a bank and being backed by cash reserves, lacks FDIC coverage — a distinction SoFi must communicate clearly as exposure to the token broadens beyond card settlement mechanics.

For the broader stablecoin market, a nationally chartered, OCC-regulated bank moving card settlement volume on-chain through Mastercard's network marks a structural shift: stablecoin rails moving from crypto-native payment corridors into mainstream card economics.

Watch for three markers in coming quarters: growth in SoFiUSD circulation beyond the roughly $300 million reported at the end of Q2 2026, any named merchant partnerships, and the first outside banks signing on through Galileo.