This is the second post in our stablecoin series. In the first article we explored how money moves through today's financial system and why stablecoins represent a fundamentally different settlement rail. In this post, we'll look at a specific example: how card network settlement works today, and why stablecoins can help eliminate one of its longest-standing constraints — the weekend.
Most payments feel instant.
You tap your card, get your coffee, and walk away in seconds. From the consumer's perspective, the transaction is complete.
Behind the scenes, however, the actual movement of money often takes days.
If you make a purchase on Friday night, there's a good chance the banks involved won't settle that transaction until Monday morning. That's not because the technology is slow. It's because much of the financial system still operates on rails that take weekends and holidays off.
This is one of the most practical examples of where stablecoins can improve how money moves.
Authorization Isn’t Settlement
When you tap your card, the merchant sends an authorization request through the card network to your bank.
Your bank checks whether the account is in good standing, whether sufficient funds or credit are available, and whether anything about the transaction looks suspicious. It then returns an approval or decline, usually in less than two seconds.
That's the experience most people think of as a card payment. But no money has actually moved yet. The authorization simply tells the merchant that the transaction is valid and that the issuing bank will stand behind it. The actual movement of funds happens later through a separate process called settlement. The speed you experience at the register is possible precisely because authorization and settlement are separate.
How Card Settlement Works
The bank that “issued” you your card is called the issuing bank. Every business day, card networks calculate what each participating issuer owes, and the issuing bank is required to pay that obligation.
Merchants have their own bank called the acquiring bank. Just as the network calculates the net amount due from issuers, it also calculates the net amount due to acquirers who receive those funds and pass them along to merchants. Under normal circumstances, merchants receive funds within one to three business days.
The question is: what drives the time it takes to get funds?
The Weekend Problem
The biggest source of settlement delay isn't the card network itself.
It's the settlement rail underneath it.
Today, card network settlement ultimately relies on Fedwire, which operates only during defined business hours and does not run on weekends or federal holidays.
When a customer makes a purchase on Friday evening, the transaction will be authorized in a few seconds, but the movement of funds, settlement, cannot occur until Monday when
Fedwire becomes available again on Monday.
Nothing is broken. The system is functioning exactly as designed. That’s because this system was designed to only be used by humans during business hours. Fedwire was first implemented in 1915 and the system was named Fedwire because a person needed to “wire” information across telegraph lines.
While Fedwire itself has undergone improvements to how information is communicated, its use only during business hours has remained, not due to technology constraints, but due to operational ones. As we’ll discuss in a later post, managing 24/7 liquidity is hard and largely explains why every bank isn’t on available instant payment rails like RTP and FedNow.
The bottom line is that the card networks require payment over Fedwire and this payment can only occur during business hours.
Why Collateral Matters
This settlement delay creates another challenge: risk.
Merchants still expect to get paid, even when settlement won't occur for several days. Card networks need confidence that participating banks can meet their obligations when settlement eventually happens. To manage this risk, networks require issuing banks to post collateral against their expected settlement obligations. This collateral is set aside as a buffer until the rails reopen.
In practice, this cost doesn't always stay with the bank. Many card programs today are built by fintechs that partner with issuing banks to offer financial products. In these arrangements, the fintech is often responsible for prefunding or collateralizing the settlement obligation.
That idle capital has a real cost. And depending on the program structure, that cost may ultimately be passed through to the end customer in the form of fees or less favorable economics.
Where Stablecoins Change the Equation
Stablecoins don't operate on banking hours - they can move 24 hours a day, seven days a week, 365 days a year.
That single characteristic changes the economics for fintechs running card programs.
Instead of prefunding settlement obligations and waiting for traditional rails to reopen, obligations can be settled each day, including weekends, and holidays. Less idle capital means lower carrying costs, and a more efficient program overall.
For the end customer, nothing looks different. Cardholders still spend dollars. Merchants still receive dollars. The card works exactly as it always has. What's changing is the infrastructure underneath to one that reduces risk, lowers the cost of providing the service, and makes the underlying movement of money more instant.
A natural and very fair question is why didn’t the card networks enable FedNow or RTP — two instant payment systems that offer 24/7/365 settlement using dollars today? While I can only posit, my guess is that adding a new payment rail to the networks is a non-trivial task and these two systems are only used in the US. Conversely, blockchain networks are global and unlock instant settlement for every country they operate in, not just the US.
Stablecoin-backed Card Programs Benefit Even More
Stablecoin based settlement is no longer a theoretical concept. Banks like Lead now settle card network obligations using stablecoins behind the scenes, allowing any program to benefit from infrastructure that operates around the clock.
For programs built around stablecoins, the advantages are even more direct than weekend settlement alone. Historically, stablecoin-backed card programs needed to convert stablecoins into fiat before settlement could occur. That introduced additional costs, operational complexity, and another potential point of failure.
Now, those programs can settle with Lead, the Issuer, using the same asset their customers already hold. Instead of moving from stablecoin to fiat and back again, funds can move through a more direct settlement path. The result is lower friction, fewer conversion steps, and a more efficient flow of funds.
This is all happening at the settlement layer — consumers will never notice the difference. But for the banks and programs responsible for moving money behind the scenes, the difference is true operational benefits and cost savings.
Conclusion
Our financial infrastructure is a genuine marvel. It moves trillions of dollars every day, has supported the global economy for over a century, and does so with remarkable reliability. That durability is also precisely why it's so hard to change.
Adding a new payment rail to an established network is expensive, operationally complex, and carries real risk. Networks don't make that investment lightly. What blockchains offered was a rare combination of properties compelling enough to justify the effort: instant, always-on settlement, a global network, growing adoption, and use cases that simply weren't possible before.
The weekend problem is one of the clearest examples of what becomes solvable when the underlying rail operates around the clock — a killer feature of stablecoins.
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