Citi Coinbase stablecoin payments: a big-bank acquirer now takes stablecoins at checkout — and converts them before the merchant holds one

What Citi and Coinbase announced on September 28

The facts, from Citi's press release and Coinbase's announcement: the two companies expanded a collaboration first announced in October 2025 around fiat-to-crypto payment infrastructure. The expansion has two parts. Both launch in the United States first, with more capabilities promised in the coming months.

Stablecoin acceptance through Spring by Citi. Spring by Citi is the bank's integrated payment acceptance platform. Citi describes it as an end-to-end digital payments service for ecommerce and B2B funds flows, with direct settlement to clients' bank accounts at Citi. Citi's institutional clients will be able to accept stablecoin payments at checkout through it, with Coinbase Payments powering acceptance. In Citi's words: "The solution automatically converts digital currency into fiat, with Citi settling funds as the bank of record. This allows merchants to serve over 150 million stablecoin holders globally without needing to hold, custody or manage digital assets directly."

Coinbase Virtual Accounts, powered by Citi. Coinbase chose Citi's Virtual Account Wallet, part of Citi Services' banking-as-a-service business, to power Coinbase Virtual Accounts. They are bank-account-like accounts that accept, hold and pay funds, with incoming fiat automatically converted into stablecoins.

Three executives were quoted. Ashish Bajaj, Citi's Head of Services for North America: "Our goal is to build the next generation of payments infrastructure that our clients need – one that is seamless, interoperable, and operates across both traditional and digital payments instruments and networks." Alec Lovett, Head of Infrastructure Product at Coinbase, said shared customers "can move between fiat and digital assets without ever having to think about which one they're touching." And Brett Tejpaul, Head of Coinbase Institutional, called Citi "exactly the kind of regulated banking partner the digital asset economy needs to move from experimentation to everyday commerce."

What the announcement left out, as The Block and other outlets noted: which stablecoins are supported, on which networks, what acceptance or conversion costs, the settlement terms, and any named client or volume.

A tender, not a treasury: how to read Citi Coinbase stablecoin payments

Strip out the vocabulary and the design is familiar. A stablecoin enters the way a card, a wallet or a bank transfer enters an acquirer: as a payment method on the checkout page. Something inside the acquirer's stack receives it. The merchant's side of the ledger shows what it always shows: a credit in dollars, settled on the acquirer's terms, into an account at the bank.

That is a coherent product, and for its intended customer it may be the right one. Citi's institutional clients are large companies. Their treasury runs on bank accounts, their auditors expect cash to look like cash, and they have no appetite for key management. What they want is simple: let customers pay the way they like and don't touch the books. Spring's answer does exactly that.

But be precise about what a merchant gets. It is reach, meaning access to stablecoin holders as buyers, and nothing else the stablecoin offers. The token's other properties belong to whoever receives it: it settles in seconds, it is final, it can be spent on-chain and it moves on a Sunday. In this design, the receiver is the payments engine in the middle, not the merchant.

Lovett's line about moving between fiat and digital assets "without ever having to think about which one they're touching" states the design goal plainly. It also states the risk. If you never have to think about which one you're touching, you never get to choose either. We described this pattern in August as invisible stablecoin payments: the token stops upstream, and the merchant keeps the card-era terms.

One press release, two conversions

The most revealing thing about September 28 is that it launched both directions at once. Spring turns stablecoins into fiat for merchants. Coinbase Virtual Accounts turn fiat into stablecoins for Coinbase's payments customers. Citi sits in the middle of both, as bank of record on one side and banking-as-a-service provider on the other.

Together they map where value collects when a stablecoin economy runs through banks: at the conversion points. Every time a dollar becomes a token, or a token becomes a dollar, someone runs the conversion, sets its timing and prices it. The price may show up as a fee, a spread or float.

If all of a merchant's costs are in bank dollars (payroll, rent, domestic suppliers), one conversion at the edge is fine. It happens once. If some of those costs are in stablecoins, the design creates a round trip. A hypothetical:

• A US distributor sells to a buyer in Colombia who pays in USDC at checkout.
• The acquirer converts the USDC to dollars and settles them into the distributor's bank account on its settlement schedule.
• The distributor's supplier in Asia invoices in USDT. So the distributor buys USDT back, through an exchange, a virtual account or a bank's new tokenization service, and pays.

That is two conversions, two prices and a settlement gap to move value that arrived as a dollar stablecoin and left as one. Nobody in the chain did anything wrong. The design simply assumes the bank account sits at the center of the merchant's financial life. For more and more businesses that sell across borders or pay contractors and suppliers abroad, it doesn't.

What survives the conversion, and what doesn't

Here is a property-by-property read of what reaches the merchant when the acquirer converts, based on what was announced. Where Citi and Coinbase haven't said, we say so.

• Reach: survives. By Citi's count, 150 million stablecoin holders can pay you. This is the real gain.
• Balance-sheet simplicity: survives. No tokens on your books, no keys, no new accounting policy.
• Speed: replaced by the acquirer's settlement schedule. The customer's transfer confirms in seconds, but your credit arrives when Spring settles to your Citi account. Settlement terms for the stablecoin feature haven't been published.
• Cost: replaced by the acquirer's pricing. A stablecoin network fee costs cents whatever the ticket size. What a merchant pays an acquirer for acceptance plus conversion is a commercial term, and it hasn't been disclosed.
• Finality: belongs to the receiver. The customer's on-chain payment can't be reversed. The merchant's credit is governed by its acquiring agreement, including how refunds and disputes are handled, which wasn't disclosed either.
• The stablecoin itself: gone. You can't hold it, pay a supplier with it or keep a dollar balance outside banking hours. What you hold is a deposit.

None of this makes the product bad. It makes it a card-acquiring relationship with one more tender. The question for any business is whether it wants a new tender or a new rail.

September's pattern: banks built every leg except the merchant's wallet

Citi's move is the fifth this month in which a bank put stablecoins somewhere in the payment chain. Read in order, they share a shape:

• Sep 1: twenty-one large financial institutions, Citi among them, committed to a jointly owned company that would issue a dollar stablecoin in H1 2027. As we noted, not one sentence addressed merchant acceptance.
• Sep 9: U.S. Bank piloted USBDC, its own dollar token, on Stellar, testing freezing and clawback as features.
• Sep 10: Coinbase and Moov brought stablecoin acceptance to 1,000+ community banks and credit unions, with funds held in Coinbase custodial accounts.
• Sep 22: SoFi and Mastercard moved a card program's settlement onto a bank-issued stablecoin, a faster settlement leg the merchant never sees.
• Sep 28: Citi and Coinbase put stablecoin acceptance inside a big-bank acquirer, converted to fiat before the merchant holds any.

Issuance, clawback, custody, settlement, conversion: each announcement puts the token at a point the bank controls. None ends with the stablecoin in a wallet the merchant controls. That isn't a conspiracy; it's the business model. A bank's product is the deposit, and every one of these designs ends in one.

It also means banks won't build the merchant-held model. Some businesses want to keep the dollar stablecoin they were paid in, to pay out of it, settle on a weekend or skip the round trip. They need a different kind of processor.

Where should the conversion happen? A decision guide

Since September 28, a business that wants stablecoin customers has three real choices. They differ in one thing: where the conversion happens, and who holds the result.

1. Convert at the acquirer, into a bank deposit. This is the Spring model. It fits if you're already a Citi institutional client, your costs are all in bank dollars and reach is the only thing you want from stablecoins. You give up the speed, the weekends and the token.
2. Convert in your own wallet, into a dollar stablecoin. The customer pays with whatever they hold, and you settle in USDC or USDT in a wallet you control. You keep finality, speed and the ability to pay out on-chain. You move money to a bank on your own schedule, through an off-ramp you choose. This fits businesses with cross-border customers, stablecoin-denominated costs or payouts.
3. Don't convert at all. Keep what the customer paid. This fits crypto-native businesses that want the asset itself and accept its volatility.

Options 2 and 3 don't require you to be anyone's institutional client, and both are live today.

The non-custodial version, and how a business sets it up

Payzum is a non-custodial, crypto-only payment processor. Funds go directly to wallets the merchant controls; Payzum never holds, pools or controls them. The settlement is the payment. If you want a conversion, it runs the opposite way from Spring's: optional auto-convert into USDC or USDT, so the customer pays with what they hold and you settle in a dollar stablecoin.

To be clear about the boundary: Payzum doesn't settle into a bank account and doesn't handle fiat. If you need dollars at a bank, you move them when and how you decide. In exchange, you keep the properties that a convert-at-the-acquirer model hands to someone else:

• Speed: money is spendable on confirmation, around 0.4 seconds on Solana and about 2 seconds on Base and Polygon, on any day of the week.
• Finality: on-chain payments can't be reversed. No chargebacks.
• Custody: there's nothing to freeze, because there's no Payzum balance.
• The token: it stays yours. You can pay a supplier or contractor who wants USDC or USDT from the same balance, using stablecoin payouts on Polygon, Arbitrum, Optimism, Base, BNB Chain and Avalanche.

How it works, step by step

1. Connect wallets you control. You provide the destination addresses. That takes the custodian and the conversion desk out of the chain.
2. Choose how you get paid. Online, use hosted checkout, no-code payment links and buttons, invoices with expiry and overpayment detection, subscriptions, or a drop-in plugin for WooCommerce, Magento, PrestaShop, Shopify and other carts. In person, use the Payzum POS: a fresh QR code for each sale, any phone as a terminal, and cashiers who log in with a PIN.
3. Pick your networks and settlement currency. Choose from Bitcoin, Ethereum, Solana, Polygon, Base, Arbitrum, Optimism, BNB Chain and Avalanche. Turn on auto-convert to USDC or USDT if every sale should settle as a dollar.
4. Reconcile automatically. Signed webhooks fire on every payment, the REST API exposes the same events, and an audit log shows what settled and when. Your finance team books it like any other receipt.

Spring by Citi stablecoin acceptance vs a non-custodial rail: comparison

What the September 28 announcement describes, set against what a merchant can switch on this week.

Fair objections

"Citi is a regulated bank. Isn't that safer than a wallet?"

For the deposit, yes: it's a bank deposit, with everything that implies. But the question here is the payment, not the deposit. A regulated intermediary still sets the terms: when you get paid, what it costs, and whether a sale can be pulled back. Self-custody swaps that for key management of your own. That is a real responsibility, usually handled with a hardware wallet or multisig, and it means no one else can hold, pause or reverse what you've been paid.

"Our auditors want cash, not tokens."

Then settle in a dollar stablecoin and sweep to the bank as often as your policy requires. The difference is that you set the timing. The accounting question is evolving too: FASB's August proposal on stablecoins and cash equivalents is worth reading with your auditor.

"We're not a Citi client, and we're not an enterprise."

Then, as announced, Spring isn't an option for you. That describes most businesses. The alternatives in this piece don't depend on who your bank is.