A cross-border payment often has a slow part that is hard to see.
The slow part is usually the banking settlement between two domestic systems.
The stablecoin sandwich is one way to route around that bottleneck.
What is a “stablecoin sandwich” in practical terms?
A stablecoin sandwich breaks one cross-border payment into three legs: on-ramp, on-chain transfer, and off-ramp.
The two outer legs use local banking rails.
The middle leg uses a stablecoin transfer on a blockchain.
This is one reason the mechanism is described as a sandwich: fiat on the outside, stablecoin in the middle.
How the three-leg flow works
The stablecoin sandwich is a sequence of conversions and transfers.
- On-ramp (fiat to stablecoin). The sender converts local currency into a stablecoin such as USDC or USDT using local rails.
- Transfer (blockchain movement). The stablecoins move across a blockchain network, typically with near-real-time finality.
- Off-ramp (stablecoin to fiat). The stablecoins are sold for the recipient’s local currency and paid out using local payout rails.
The middle leg reduces reliance on the traditional correspondent banking network.
Why this can reduce prefunding pressure
Many remittance networks pay out locally from prefunded pools.
That mechanism is described in prefunding and net settlement.
If the stablecoin leg settles quickly, a provider may be able to reduce how long capital sits in destination pools.
This can change working capital needs and liquidity management, but it does not remove them.
Where FX cost still shows up
Most high-liquidity stablecoins are pegged to the U.S. dollar.
In non-USD corridors, a USD-pegged stablecoin can add extra conversions.
For example, EUR to BRL routing via a USD stablecoin typically implies EUR to USD, then USD to BRL.
Each conversion can add a spread.
In many corridors, the FX markup is still a major cost driver. See why FX is the real cost in remittance.
What operational friction remains at the edges
On-chain settlement does not remove compliance and banking constraints at the on-ramp and off-ramp.
Two constraints tend to dominate:
- On-ramp requirements. Converting fiat to stablecoins typically requires identity checks and banking access.
- Off-ramp availability. Paying out in local currency requires local licenses, partners, and liquidity.
Off-ramp quality and cost vary by corridor.
Regulatory and classification constraints
The stablecoin layer operates inside a mixed legal environment.
Depending on jurisdiction, stablecoins can be treated as e-money, payment instruments, commodities, or something else.
The rules that matter most are often at the on-ramp and off-ramp, where money transmission and sanctions compliance are enforced.
For stablecoin reserve structures that influence risk, see stablecoins.
