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The Stablecoin Sandwich: Why Faster Money Still Gets Stuck at the Edges
A payment can cross a blockchain in seconds and still take hours to reach a supplier. The reason is the stablecoin sandwich: a slow conversion from fiat into a stablecoin, a fast transfer through the middle, then another slow conversion back into local currency.
That was the warning from Mastercard executive Matthew Driver in a CNBC interview on 27 October 2026. Stablecoins may make some remittances and less commonly traded currency pairs faster and more efficient, he said. But a quick transaction in the middle does not guarantee a quick payment from end to end.
For merchants and treasurers, that shifts the practical question. It is not simply whether to accept stablecoin payments. It is what happens when money enters and leaves the digital asset network: how quickly it can be converted, what the conversion costs, when local funds become usable, and how the transaction is reconciled.
The stablecoin sandwich: where payment time goes
A cross-border payment has several steps, and settlement speed is only one of them. A business may need to fund a wallet or exchange account, complete checks, convert funds into a stablecoin, transfer that asset, convert it again, and arrange a local bank payout. Each stage can involve separate providers, operating hours, liquidity requirements and compliance processes.
The blockchain transfer may be near-instant. But if an exchange has limited liquidity in a particular currency, the recipient needs additional checks, or the local payout runs on a slower schedule, the total journey is still constrained by those edges.
Connecting real-time payment systems to stablecoin exchanges at both ends could reduce delays. Driver’s caveat matters: the infrastructure must be enabled and accessible to the businesses that need it. Faster payments require workable connections, clear responsibilities and reliable local payout options, not just a faster rail.
This is why a headline settlement time can be misleading. Businesses need to measure the full journey from the point they fund a payment to the point the recipient can use the money.
What Mastercard and BVNK change
Mastercard completed its acquisition of stablecoin infrastructure firm BVNK in August 2026. On 15 October, the two companies launched the Mastercard Global Money Platform, bringing Mastercard’s payment capabilities and BVNK’s infrastructure together through a single API.
Banks, fintechs and enterprises can embed multi-currency accounts that hold fiat and stablecoins side by side, real-time conversion, stablecoin-linked cards and local bank payouts through Mastercard Move. The platform also supports treasury, payment and settlement activity. Early integrators include Nuvei, Marqeta, Ontop, Bolt Group and Almond FinTech.
Mastercard says Move reaches more than 17 billion endpoints, with coverage expected to expand to more than 40 currencies across 200-plus countries and territories in 2027. That combination is strategically significant: the platform aims to link digital value with local currency accounts and established payout channels, rather than treating the on-chain transfer as the whole payment.
It does not mean every corridor will immediately have the same speed, price or availability. But a single integration that connects conversion, accounts and payouts could reduce the number of separate providers and processes businesses must coordinate.
Risk controls are part of the infrastructure, too. Mastercard announced Stablecoin Security in October, with American Banker reporting on the launch on 22 October. The service is designed to assess fraud and financial crime risk before funds move from traditional rails to blockchain. That reinforces a basic operational point: money may move quickly, but appropriate checks still need to happen at the right stage.
Visa’s move shows the middle is industrialising
Visa is also moving stablecoin-enabled money movement into live operations. On 15 October, it announced that Visa Direct stablecoin prefunding was moving from pilot to commercial deployment, with Inyo Global as its first enabler. Eligible clients and partners can prefund cross-border payouts using USDC in near real time, rather than relying only on traditional funding windows.
The distinction is important: this announcement concerns prefunding for Visa Direct payouts. It is evidence that stablecoin capabilities are moving into commercial payment workflows, not proof that every conversion or last-mile payout is now instantaneous.
Together, these developments show the middle of the sandwich becoming more production-ready. Networks are connecting digital assets to payment services and developing ways for businesses to fund transfers with stablecoins. The harder test remains whether funds can move efficiently into and out of local currency, across the corridors and operating hours a business actually uses.
What Australian merchants and treasurers should examine
For Australian businesses, the edges are especially tangible. A retailer paying an overseas platform, a logistics firm settling with suppliers, or a marketplace moving funds to sellers needs to understand the total cost of receiving or sending value, not only the speed of the blockchain transfer.
First, examine the AUD conversion spread. A quoted transfer fee may not capture the difference between the reference exchange rate and the rate actually applied. That difference can become material across repeated supplier payments or high-volume platform payouts.
Next, compare payment date with value date. A payment instruction can be marked complete while the funds are not yet available to the recipient or usable in the business’s account. If the value date differs from the date shown in a payment system, cash-flow forecasts and supplier expectations can diverge.
Finally, check how the payment will appear in accounting and reconciliation systems. If the stablecoin transfer, conversion and local bank payout generate separate records, finance teams need a dependable way to match them. Faster transfer is a limited advantage if it creates manual work or uncertainty about fees, timing and final settlement.
The RBA’s first merchant fee tables are due on 30 October. The lesson applies beyond card costs: you cannot optimise a cost you cannot see. Stablecoin payments need the same discipline. Businesses should ask for a transparent breakdown of conversion charges, payout fees, timing and any liquidity costs before comparing a new route with existing international payments.
Quantum Payments has also explored how payment controls and transaction histories shape operations. Read our analysis of transaction-level controls in B2B payment automation, payment history across recurring charges, and the accountability gap in agentic payments.
A seven point merchant checklist
Frequently asked questions
What is a stablecoin sandwich?
It is a payment journey with a slow conversion from fiat into stablecoins, a fast stablecoin transfer, and a potentially slow conversion back into fiat at the destination.
Do stablecoin payments make cross border payments instant?
Not necessarily. The blockchain transfer can be fast, but funding, conversion, compliance checks and local bank payouts can add time.
What does Mastercard’s Global Money Platform provide?
Launched with BVNK, it offers a single API for businesses to embed multi-currency accounts holding fiat and stablecoins, conversion, stablecoin-linked cards and local bank payouts through Mastercard Move.
What should Australian merchants compare before using stablecoins?
Assess the full AUD conversion spread, payout fees, payment and value dates, corridor availability, compliance responsibilities and reconciliation requirements.
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