What Is the Stablecoin Sandwich?
The stablecoin sandwich is a cross-border payment model where money starts and ends as local fiat currency, but travels as a stablecoin in between.
The pattern has three steps: fiat in, stablecoin across, fiat out. The sender pays in their local currency. A licensed provider converts that fiat into a dollar-denominated stablecoin like USDC or USDT. The stablecoin moves to the recipient side, where another licensed provider converts it back into the recipient's local currency and delivers it to their bank account.
Neither the sender nor the recipient ever touches a stablecoin. From their perspective, they sent and received fiat. The stablecoin layer is settlement infrastructure, invisible to both parties.
This model has become the standard architecture for enterprise stablecoin payments. Convera and Ripple announced a partnership in March 2026 built explicitly on this model, with Convera orchestrating the end-to-end payment experience and Ripple providing settlement and on/off-ramp infrastructure underneath [1]. Stripe, Visa, Mastercard, and most B2B payment platforms building on stablecoin rails use this same architecture [2].
A March 2026 paper from the Federal Reserve analyzed the model and noted that while the on-chain cost of moving stablecoins between entities is very small, the on-ramp and off-ramp costs associated with converting between stablecoins and fiat currency are where the real cost structure lives [3].
This guide breaks down each step, the true cost stack, where the model outperforms SWIFT, and what to look for when evaluating providers.
How It Works: The Three Steps
Step 1: Fiat to Stablecoin (On-Ramp)
The sender's payment provider converts their local currency into a stablecoin. This conversion is handled by a licensed money services business or payment institution in the sender's jurisdiction.
What happens at this step: KYC/KYB verification of the sender (or reliance on existing verification if already onboarded), AML and sanctions screening against global watchlists, currency conversion from the sender's local currency to a USD-denominated stablecoin, and Travel Rule data capture including originator and beneficiary information as required under FATF Recommendation 16 [10].
The conversion itself takes seconds to minutes. The compliance layer is what determines actual speed. For pre-verified business customers with established accounts, on-ramping is near-immediate.
Step 2: Stablecoin Transfer (Settlement)
The stablecoin moves from the sender's provider to the recipient's provider. This is the settlement leg, and it replaces the entire correspondent banking chain.
In a traditional SWIFT payment, this step involves 3 to 6 intermediary banks, each running its own compliance checks, holding the payment in queue during banking hours, and potentially deducting fees. The stablecoin equivalent is a single blockchain transaction.
Settlement typically completes in seconds, regardless of time zone, banking hours, or geography. A Harvard Business School paper analyzing stablecoin payment costs found that blockchain gas fees across major networks averaged well below $1 per transaction, and on some networks below $0.01 [4].
Step 3: Stablecoin to Fiat (Off-Ramp)
The recipient's provider converts the stablecoin back into local currency and delivers it to the recipient's bank account, mobile wallet, or e-wallet.
What happens here: beneficiary verification and screening against sanctions lists, currency conversion from the stablecoin to the recipient's local currency at the prevailing market rate, and local delivery via the fastest available rail in the recipient's market.
This is the step where most remaining friction lives. Off-ramp speed depends on stablecoin infrastructure maturity in the recipient's country, local banking rail availability, and FX liquidity depth. In well-served corridors like US to India, or Singapore to Philippines, off-ramping can complete within hours. In thinner corridors, it can take a business day.
Full Sandwich vs Open Sandwich
The model described above is the full sandwich: fiat in, stablecoin across, fiat out. The entire flow is automated and the recipient receives local currency.
The open sandwich is a variant where the first two steps are the same but the stablecoin is not automatically converted back to fiat. The recipient holds the stablecoin in a wallet and decides when to convert [5].
The open sandwich is gaining traction in two scenarios. First, emerging market sellers hedging against local currency volatility: a supplier in Nigeria or Argentina receiving USDC may prefer to hold the stablecoin rather than immediately convert to naira or pesos, especially during depreciation. They convert on their own schedule at a rate they choose. Second, fintechs and platforms managing treasury in stablecoins: a neobank or PSP may accept the stablecoin directly into their treasury, using it as working capital for outbound payouts rather than converting to fiat and back.
For most B2B cross-border transactions, the full sandwich remains standard. The recipient is a business expecting local currency in their bank account.
The Double-Decker Variant
Most sandwich flows use a single USD-denominated stablecoin as the bridge asset. But a variant is emerging for corridors where both endpoints have their own fiat-pegged stablecoins.
The Harvard Business School paper calls this the double-decker sandwich [4]. The flow is: local fiat to USD stablecoin, USD stablecoin to foreign-currency stablecoin (e.g. EURC for euros), and then foreign-currency stablecoin to local fiat. The middle swap happens on-chain through a decentralized exchange, removing the need for a centralized off-ramp to handle FX conversion.
Today, this variant is limited because most stablecoins in circulation are USD-denominated. Circle's EURC is the most developed non-dollar stablecoin, and it is gaining traction for European corridors [6]. As more fiat-pegged stablecoins reach meaningful liquidity, the double-decker model may reduce FX costs further by enabling on-chain currency conversion with tighter spreads.
For most businesses today, the single-layer sandwich (fiat to USDC to fiat) is the practical choice.
Why the Sandwich Emerged: What It Replaces
The stablecoin sandwich is a response to specific structural problems in the correspondent banking system that decades of incremental upgrades have not fixed.
Multi-hop intermediary chains. A SWIFT payment from Singapore to Nigeria might pass through 4 to 5 banks. Each intermediary adds time, each can deduct fees, and each runs compliance checks that can hold the payment for hours or days. The sandwich replaces this chain with a single settlement leg.
Banking hour restrictions. Correspondent banking operates within business hours in each jurisdiction, and time zones compound delays. A payment initiated Friday afternoon in Singapore might not settle in Lagos until Tuesday. Stablecoin settlement operates 24/7/365.
Opaque FX markups. In the correspondent model, FX conversion often happens at an intermediary bank with limited visibility into the rate applied. The World Bank's Remittance Prices Worldwide database shows the global average cost of sending $200 remains above 6%, with banks averaging 14.55% per transaction [7]. The sandwich model makes FX transparent because it happens at the on-ramp and off-ramp, not buried inside the chain.
Prefunding requirements. Traditional payout providers require businesses to maintain pre-funded balances in nostro accounts across multiple currencies. The sandwich model enables per-transaction funding: the stablecoin is acquired at the point of payment and delivered immediately, eliminating the need to park capital across jurisdictions.
McKinsey and Artemis Analytics estimated in February 2026 that actual stablecoin payment volume reached approximately $390 billion annually, with B2B payments making up roughly 60% of that total [8].
What It Actually Costs: The Real Cost Stack
The stablecoin sandwich is not free. The on-chain transfer in the middle is near-zero cost, but the full end-to-end cost has four components.
On-ramp conversion fee: 0.1% to 0.5% for institutional and B2B volumes, depending on provider, currency pair, and volume tier.
Blockchain transaction fee (gas): Under $0.01 on networks commonly used for enterprise settlement. $0.20 to $2.00 on Ethereum mainnet depending on congestion. Economically negligible for most deployments [4].
Off-ramp conversion fee: The largest single cost component. Ranges from 0.1% to 1.5% depending on corridor. Mature markets (US, EU, Singapore, Hong Kong) are cheaper. Emerging markets (Nigeria, Argentina, Pakistan) are pricier due to thinner liquidity.
FX spread: The difference between the market mid-rate and the rate applied at conversion. Major pairs (USD/EUR, USD/GBP, USD/SGD) typically 0.1% to 0.3%. Emerging market currencies 0.5% to 2.0%.
Total all-in for a typical B2B corridor: 0.5% to 2.5%. This compares to 3% to 7% for traditional correspondent banking on equivalent corridors [7]. The Federal Reserve paper noted that the on-ramp and off-ramp conversion steps are where the remaining economic friction concentrates, driven by regulation, liquidity depth, and provider competition in each local market [3].
Corridor-Level Analysis: Where the Gains Are Largest
The pattern is consistent: the sandwich model delivers the largest savings on emerging market corridors where correspondent banking is most expensive and slow. On developed market corridors like US to EU, the savings are meaningful but smaller.
The highest-impact corridors share three characteristics: expensive SWIFT fees (above 3%), slow settlement (2+ days), and local currency volatility that makes fast delivery valuable. India, Nigeria, Brazil, Argentina, Philippines, Turkey, and Pakistan all fit this profile.
What the Sandwich Does NOT Solve
The stablecoin sandwich is not a silver bullet. A few limitations are worth understanding.
Off-ramp bottlenecks. The on-chain settlement is fast, but final delivery depends on local banking infrastructure. If the recipient's country has slow domestic payment rails, the sandwich cannot fix that.
FX volatility during conversion. There is a brief window between the on-ramp and off-ramp conversions where the stablecoin holds USD value. If the recipient's local currency moves against USD during that window, the final delivered amount changes. For most transactions this window is minutes, so exposure is small. For very large transfers, it matters.
Regulatory fragmentation. Stablecoin regulation varies by jurisdiction. A provider licensed in Canada may not be licensed in the UAE. The sandwich model works only where both on-ramp and off-ramp providers are licensed and operational.
Counterparty risk at the ramps. The sender trusts the on-ramp provider to convert fiat to stablecoin faithfully. The recipient trusts the off-ramp provider to deliver fiat. These are licensed, regulated entities, but the trust model is different from bank-to-bank correspondent transfers where both parties are prudentially supervised.
None of these limitations are unique to the sandwich model. They exist in varying forms across all cross-border payment architectures. The relevant question is whether the sandwich's advantages in speed, cost, and transparency outweigh these tradeoffs for your specific corridors and use cases.
The Compliance Layer
Every step in the sandwich flow is a regulated activity.
On-ramp providers must hold money transmission licenses (or equivalent) in the jurisdictions where they convert fiat to stablecoins. They perform KYC/KYB, screen against sanctions lists, and capture originator data under the Travel Rule [10].
Off-ramp providers must be licensed in the recipient's jurisdiction. They screen beneficiaries, verify wallet ownership, and deliver funds through compliant local rails.
The settlement layer carries Travel Rule data. Under the FATF Recommendation 16 update from June 2025, stablecoin transfers involving virtual asset service providers must include originator and beneficiary information, just like traditional wire transfers.
Key regulatory frameworks now live and specific: the US GENIUS Act (July 2025) mandates 1:1 reserve backing, BSA compliance, and federal oversight for payment stablecoin issuers [11]. The EU's MiCA regulation requires EMT authorization for euro-denominated stablecoins. Singapore, Canada, Hong Kong, and Australia each have their own frameworks for virtual asset service providers.
How to Evaluate a Provider
Five criteria separate production-grade stablecoin sandwich infrastructure from fragile setups.
Licensing and regulatory coverage. The provider should hold specific stablecoin or virtual asset licensing in the jurisdictions where they operate on-ramp and off-ramp services.
Off-ramp depth. The on-ramp side is relatively standardized. Off-ramp quality varies dramatically. Ask: how many local payout markets does the provider cover? What rails do they use for last-mile delivery? What are actual settlement times in your target corridors?
Per-transaction vs pre-funded model. Some providers require pre-funded stablecoin balances. Others allow per-transaction funding where you fund each payment at initiation. Per-transaction funding eliminates trapped liquidity.
Remitter transparency. For B2B and POBO use cases, the provider should carry the actual remitter name in the payment message, not their own name. This reduces failures at the recipient bank and satisfies regulatory transparency requirements.
Compliance integration. Travel Rule compliance, sanctions screening, and beneficiary verification should be built into the flow, not bolted on separately.
Where Tazapay Fits
Tazapay operates as a payment infrastructure provider that supports stablecoin settlement across B2B payouts, fintech POBO flows, and marketplace disbursements.
Key capabilities relevant to the sandwich model: stablecoin-funded payouts to 170+ countries via SWIFT and local rails with no prefunding required (fund per transaction with USDC or USDT); actual remitter name in payouts via SWIFT messages and many local payout rails; on-ramp via named virtual accounts in USD and SGD with conversion to USDC/USDT; off-ramp to local currency via same-day delivery through local bank networks and e-wallets in key markets and early participation in Circle Payments Network (CPN) partner.
Sources
[1] Convera/Ripple. "Convera Joins Forces with Ripple to Empower Stablecoin-Enabled Cross-Border Payments." BusinessWire, March 31, 2026. https://www.businesswire.com/news/home/20260331576971/en/Convera-Joins-Forces-with-Ripple-to-Empower-Stablecoin-Enabled-Cross-Border-Payments
[2] Polygon. "What Is a Stablecoin Sandwich? Cross-Border Payments on Stablecoin Rails." Polygon Blog, April 2026. https://polygon.technology/blog/what-is-a-stablecoin-sandwich
[3] Kim, Ruprecht, Styczynski. "Payment Stablecoins and Cross Border Payments: Benefits and Implications for Monetary Policy Implementation." Federal Reserve FEDS Notes, March 30, 2026. https://www.federalreserve.gov/econres/notes/feds-notes/payment-stablecoins-and-cross-border-payments-benefits-and-implications-for-monetary-policy-20260330.html
[4] Du, Huang, Scharfstein. "Competing Rails for Cross-Border Payments: Banks, Fintechs, and Stablecoins." Harvard Business School Working Paper, February 2026. https://www.hbs.edu/ris/download.aspx?name=Du_Huang_Scharfstein_14Feb2016.pdf
[5] Dynamic. "The Stablecoin Sandwich: Solving for Cross-Border Payments." Dynamic Blog. https://www.dynamic.xyz/blog/the-stablecoin-sandwich
[6] Circle. "Stablecoin Payments: The Next Phase of Digital Commerce." Circle Blog, January 22, 2026. https://www.circle.com/blog/stablecoin-payments-the-next-phase-of-digital-commerce
[7] World Bank. Remittance Prices Worldwide, Q1 2025. https://remittanceprices.worldbank.org/
[8] McKinsey/Artemis Analytics. Stablecoin payment volume estimates ($390B annually, 60% B2B), February 2026. Via AlphaPoint: https://alphapoint.com/blog/crypto-for-cross-border-payments-how-stablecoin-payment-integration-is-reshaping-global-money-movement-in-2026
[9] BCG. Global Payments Report, September 2025. https://web-assets.bcg.com/25/91/2269153c468ca43615442f055cb0/2025-global-payments-report-sep-2025.pdf
[10] FATF. Targeted Update on Implementation of Standards on Virtual Assets and VASPs, June 2025.
[11] EY-Parthenon. "Cost Savings and Speed Drive Stablecoin Adoption." 2025. https://www.ey.com/en_us/insights/financial-services/cost-savings-and-speed-drive-stablecoin-adoption
Stablecoin-related services are provided exclusively by Tazapay Canada Corp, a FINTRAC-registered Money Services Business. Tazapay Pte. Ltd. (Singapore) does not provide Digital Payment Token services under the Payment Services Act 2019.
