Bank of Record, Chain of Custody: Citi and Coinbase Stablecoin Payments

• Citi provides the fiat account and bank-of-record settlement in both products, and Coinbase handles every step involving a stablecoin.
• Coinbase’s documentation shows Citi-powered virtual accounts taking ACH and Fedwire deposits and converting them 1:1 into USDC, with Base as the documented sweep network.
• Spring’s tokens, chains, pricing, settlement times and volumes are unpublished.
• The GENIUS Act takes effect by 18 January 2027 at the latest, and a distributor rule covering platforms such as Coinbase starts on 18 July 2028.
• New York Fed research finds that stablecoin partner banks cut their loan share of assets by 14 percentage points against peers and hold about $1.5 billion more in reserves.

Since 28 September 2026, dollars can cross between a Citi account and a public blockchain in either direction without the bank handling a token. Coinbase’s payments customers get virtual accounts at Citi that turn incoming dollars into stablecoins. Citi’s institutional merchants take stablecoins at checkout through Spring by Citi and receive dollars in their accounts. Citi expanded its Coinbase partnership with both products and named itself bank of record for the merchant leg.

Citi does the same job in both. It holds the dollars at the point where they enter or leave a chain, and Coinbase runs every step that involves a stablecoin, from conversion to custody to the transfer itself. In neither flow, as disclosed, does Citi issue, custody or carry a stablecoin. The token in the middle is an issuer’s liability, held or converted by Coinbase. For a bank that runs its own tokenized deposit network, that is a deliberate line, and it lets Citi earn from public-chain payments while the instrument and most of its risks sit with other firms. Citi keeps the edges.

Neither company has published pricing, volumes, live merchant names, settlement times or the list of tokens and chains Spring accepts. Coinbase’s developer documentation answers more of the operating questions than either press release, and the rest depend on contracts and on a GENIUS Act regime due to take effect by 18 January 2027.

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What Citi and Coinbase announced in September 2026

The first phase of the relationship, announced on 27 October 2025, covered fiat pay-ins and payouts for Coinbase’s on and off ramps, plus payments orchestration. Citi said then that the two firms would explore alternative ways to pay out from fiat into onchain stablecoins.

Coinbase Virtual Accounts run on the Virtual Account Wallet from Citi Services, a banking-as-a-service product, and give Coinbase’s payments customers what Citi calls bank-account-like functionality to accept, hold and pay funds, with incoming fiat converted automatically into stablecoins. Spring by Citi, the bank’s payment acceptance platform for institutional clients, adds stablecoins as a payment method, with Coinbase handling processing and conversion and Citi settling the fiat as bank of record. Both products launch in the United States first, and both companies say more capabilities will follow in the coming months.

Coinbase had already sold the same stack to other distributors. Nium let its customers fund cross-border payouts with USDC on Coinbase infrastructure from April 2026, and Checkout.com opened stablecoin acceptance to eligible enterprise merchants on 2 June 2026 with Coinbase Payments underneath. Citi adds a global bank’s merchant book and its settlement accounts to that distribution. By its own count, Citi banks 90% of the top eCommerce companies and 15 of the world’s 20 largest fintechs.

Citi lists Spring, its banking-as-a-service unit and a newly integrated 24/7 USD Clearing and Citi Token Services offering as parts of one strategy for digital commerce, and the last of those moves dollars across borders around the clock.

Citi’s release carries two large numbers, and neither measures these products. The bank says it moves about $6 trillion a day, a figure for its whole payments franchise. Its other figure, more than 150 million stablecoin holders worldwide within reach of Spring merchants, is a market-size claim with no published method. No figure from either company yet describes money moved through the new products.

How Coinbase Virtual Accounts work on Citi rails

Coinbase’s fiat deposit destinations quickstart gives the most detailed public description of the Citi leg. A developer issues a virtual account “powered by Citi” to a customer who has passed KYC. The deposit instructions in the example response name Citibank N.A. as the receiving bank, and on 7 October 2026 the page listed ACH and Fedwire as the publicly supported rails. Incoming dollars convert 1:1 into USDC. The press releases never name the stablecoin, and the documentation names only USDC.

Each account starts as pending while Citi provisions it and becomes active once it can receive funds. No webhook fires on that change, and integrations poll for it. Deposits trigger processing and completed events. The USDC can sit in the customer’s custodial balance at Coinbase, or the developer can set an onchain target address when creating the account and every deposit then sweeps there automatically. The worked example targets Base. A swept balance sits in a wallet Coinbase no longer controls, and it stays exposed to issuer freezes like any other USDC.

Funding is first-party. The documentation says the sender name must match the KYC’d customer, which suits a business moving its own dollars onchain and rules out collecting third-party receivables into the account. Sandbox accounts connect to no bank at all, and production requires real KYC and a production key.

The “pay” half of Citi’s description runs through Coinbase’s custodial account. Coinbase’s payments product overview lists fiat payouts from that account over ACH, Fedwire, Swift and SEPA, alongside crypto transfers to any address. A customer can therefore receive dollars at Citi, hold USDC at Coinbase and pay a supplier by wire from the same Coinbase account, with each leg on a different provider’s books.

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Coinbase advertises automated mint and burn and says it holds nearly $20 billion in USDC on its platform, and a conversion could draw on either route. A mint moves the dollars into Circle’s reserves, which Circle keeps in bank cash, short-dated Treasuries, overnight repo and a reserve fund managed by BlackRock. A sale from inventory leaves them with Coinbase, wherever Coinbase banks them. For Citi’s deposit book, that routing decides whether each conversion brings a fee alone or a fee plus a balance.

Stablecoin acceptance in Spring by Citi

A buyer pays a Spring merchant in a stablecoin, Coinbase Payments processes and converts the payment, and Citi credits the merchant’s account in fiat. Citi’s release says merchants can serve stablecoin holders “without needing to hold, custody or manage digital assets directly,” and the merchant’s treasury, ledger and bank balance stay in dollars throughout.

Coinbase’s general Payment Acceptance product shows what the engine underneath supports, and the table sets that against what the two companies have disclosed for Spring.

Coinbase names MetaMask, Trust Wallet and Base Pay among the wallets a buyer can pay from. The buyer side runs on signed authorizations. Coinbase’s authorization flow has the wallet sign one of several payload types, EIP-3009 among them. ERC-3009 lets a token holder sign a transfer that a third party submits onchain, and Coinbase says buyers pay the exact checkout amount with no gas on top. Each signed authorization carries a validity window and a random 32-byte nonce, and the EIP-712 domain ties it to one chain and one token contract. A buyer can sign several authorizations at once without them colliding, and a signature from Base cannot be replayed on Polygon.

Authorization and capture are separate steps with their own expiry deadlines, the same structure merchants already run for cards.

Settlement finality across ACH, Fedwire and Base

The Federal Reserve lists the finality of payments credited to master accounts as a feature of the Fedwire Funds Service. An ACH credit can come back. Nacha’s rules let an originator or its bank reverse an erroneous entry, such as a duplicate, a wrong receiver or a wrong amount, within five banking days after settlement. A USDC transfer on Base is undone only by a new transfer in the other direction, or by an issuer freeze.

Take a hypothetical treasury team that sends $500,000 by ACH into its Coinbase Virtual Account, with an automatic sweep to a self-custodied Base address. The deposit converts and sweeps the same day. Two banking days later the team’s bank finds a duplicate and submits a $500,000 reversal, inside Nacha’s window. The USDC already sits in a wallet Coinbase does not control. Someone carries that debit while the money is recovered, and the published material does not say whether that is Coinbase, Citi or the customer under its account terms.

The only permitted sender is the account holder, and any reversal claim runs against a customer Coinbase has already identified. Holds, deposit limits and prefunding are the usual tools for the gap, and neither company has said how it uses them here.

The onchain payment completes first, and the dollar credit follows after Coinbase converts and Citi posts. Coinbase markets its own product as settling “in seconds, not days.” Citi has published no settlement window for Spring, and a treasury team reconciling against a bank statement needs one. Refunds go out as new payments, in full or in part.

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Fedwire and the National Settlement Service operate Monday through Friday, excluding holidays, and the Federal Reserve plans Sunday through Friday operation no earlier than 2028. A stablecoin payment captured on a Saturday settles onchain that Saturday. If the merchant’s dollar credit depends on Fedwire, it waits for Monday. Citi’s 24/7 USD Clearing moves dollars round the clock across Citi’s own network, and neither company has said whether Spring settlement uses it.

Citi Token Services, JPM Coin and public stablecoins

Citi announced the Coinbase products on the same day it took Citi Token Services into Japan and the UAE. CTS tokenizes Citi deposits on a private permissioned blockchain, now runs in seven markets (the United States, Ireland, Hong Kong, Singapore, the UK, Japan and the UAE), and processes billions of dollars by Citi’s account. The bank now runs two models side by side. Its own token serves clients inside its network, and a third-party stablecoin, through Coinbase, reaches counterparties outside it.

JPMorgan took another route to the same chain. JPM Coin, ticker JPMD, is a deposit token that became available to JPMorgan’s institutional clients on Base on 12 November 2025, after Coinbase, B2C2 and Mastercard tested issuance and redemption. Two of the three largest US banks now reach public blockchains through Coinbase’s crypto market infrastructure. JPMorgan put its own liability on Coinbase’s chain, and Citi put Coinbase in front of its merchants.

Visa’s stablecoin settlement program reached a $7 billion annualized run rate by 29 April 2026, when it added five chains, Base among them, to the original four. Visa reported 50% quarter-over-quarter growth and more than 130 stablecoin-linked card programs in over 50 countries in the same release. It is the only production program in the table with a published run rate. The first volume disclosure from Citi and Coinbase will show how much of Spring’s merchant base switches the option on and how many buyers use it.

GENIUS Act dates for issuers, banks and distributors

The GENIUS Act became law on 18 July 2025, and most of its machinery waits on rules. It takes effect on the earlier of 18 January 2027 or 120 days after the primary regulators issue final implementing regulations, as the Federal Reserve restated in the reserve, capital and application proposals it released on 24 September 2026. The OCC moved first, with a proposal on 25 February 2026 that would require 10% of reserves in assets with daily liquidity and 30% in assets with weekly liquidity. It would also cap reserves held at any single institution at 40% and presume that affiliate yield arrangements break the ban on paying holders.

Citibank N.A. is a national bank. The OCC’s Interpretive Letter 1183 of 7 March 2025 confirmed that national banks may engage in crypto-asset custody, certain stablecoin activities and node verification networks, and removed the requirement to obtain supervisory nonobjection before starting.

Treasury’s proposed rules on issuance, offer and sale, published on 18 August 2026, implement a provision that starts on 18 July 2028. From that date, a digital asset service provider may not offer or sell a payment stablecoin to a person in the United States unless a permitted issuer issued it. A foreign issuer’s coin qualifies only if its home regime is found comparable, the issuer registers with the OCC, and it can comply with lawful orders. Comments on Treasury’s proposal close on 19 October 2026. Coinbase’s acceptance documentation lists USDT beside USDC. Whether processing a checkout payment counts as offering or making a coin available is a question for the final rules, and the answer decides which coins stay on a US merchant menu after mid-2028. Coins from permitted payment stablecoin issuers clear the test either way.

FinCEN and the banking agencies proposed customer identification rules for permitted issuers on 18 June 2026, covering primary-market relationships such as issuance, redemption, conversion and custody and leaving secondary-market holders out. A buyer who pays a Spring merchant from a self-custodied wallet never becomes the issuer’s customer. Screening that wallet falls to Coinbase’s own compliance program and to the merchant onboarding the two firms run.

New York Fed research on stablecoin partner banks

A New York Fed staff report by Michael Junho Lee and Donny Tou, published in February 2026, studied banks that became major stablecoin partners and compared them with similar banks that did not. Partner banks’ loan share of assets fell by 14 percentage points against the control group. Their interbank payment activity rose 67% in the nine months after a new partnership, about $658 million a day more than at control banks, and they kept about $1.5 billion more in reserve balances.

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The authors argue that stablecoins erode bank deposit franchises and pass liquidity stress into the banks that service issuers. Each day’s minting and redemption becomes payment demand at those banks. A one standard deviation rise in primary-market activity added roughly $280 million in Fedwire payments, and it raised intraday reserve volatility by about 55% of its pre-partnership average.

Ciri provides accounts, moves dollars and settles merchants. Neither announcement mentions Citi holding issuer reserves, and the OCC’s proposed 40% limit would spread an OCC-supervised issuer’s reserves across several institutions. For corporate balances it wants to keep, Citi has Token Services, where the token and the deposit are one Citi liability.

Due diligence questions for treasurers and merchants

Citi does business in more than 180 countries and jurisdictions, and both stablecoin products start in one. Expansion meets separate licensing regimes. The HKMA granted its first two stablecoin issuer licenses to HSBC and to Anchorpoint Financial, a joint venture of Standard Chartered, HKT and Animoca Brands, on 10 April 2026. Any rollout in Hong Kong would run under that licensing regime. In the EU, the same flow would fall under MiCA, which sets both the service provider’s CASP authorization and the e-money token rules for the coin.

A contract for either product should settle the points the releases leave open.

• The tokens and chains accepted for each legal entity and country.
• Whether conversion draws on issuer mints or Coinbase inventory, and the spread on each.
• Settlement time from capture to Citi credit, with cut-offs and weekend handling.
• Who carries an ACH reversal after USDC has swept out, and the holds or limits that apply.
• Handling of refunds, depegs, wrong-chain transfers and payments from sanctioned wallets.
• Which entity holds the funds at each moment, and the client’s position if Coinbase or the issuer fails.
• Pricing, including the conversion spread, the per-payment fee and virtual account charges.

Coinbase’s developer pages describe the virtual account side in far more detail than the merchant side, and the Spring contract is where the missing terms will first appear.