How Stablecoin Payments Move Money (and Where They Still Get Stuck)

Stablecoin payments are fast on the blockchain. The friction is everywhere else.

From Trading Tool to Payment Rail

For most of their history, stablecoins served one primary purpose: giving crypto traders a way to park value without leaving the blockchain. You could sell Bitcoin into USDT, wait for a dip, and buy back in, all without touching a bank account. That utility still exists, but it is no longer the main story.

Stablecoins have become payment infrastructure. Not hypothetically. In measurable, documented ways.

In 2025, Visa launched USDC settlement on Solana, letting U.S. banks settle transactions seven days a week using stablecoins. Stripe acquired Bridge, a stablecoin infrastructure company, for $1.1 billion. Mastercard enabled multiple stablecoins across its network. And the U.S. Congress passed the GENIUS Act, giving stablecoins their first comprehensive federal regulatory framework.

These are not pilot programs. They are structural changes to how money moves. But understanding why stablecoins work as payment infrastructure requires going deeper than the headlines. You need to see how the money actually flows.

How a Stablecoin Payment Actually Moves

Most explanations of stablecoin payments focus on the blockchain transaction itself: a sender signs, the network confirms, the recipient receives tokens. That part is real, and it is fast. But it is only one stage of a three-part process, and the other two stages are where the friction actually lives.

The blockchain settlement (Step 2) is genuinely different from traditional payment rails. A SWIFT wire bounces through correspondent banks, each operating in different time zones with their own processing windows. A stablecoin transfer settles peer-to-peer, on a public ledger, in minutes or less, at any hour of any day.

But the on-ramp and off-ramp (Steps 1 and 3) are where stablecoin payments still resemble the traditional system. Both require identity verification. Both depend on banking relationships. Both can be slow, expensive, or entirely unavailable depending on the country and the provider. If you want to understand why crypto still struggles with mass adoption, the on-ramp and off-ramp experience explains a lot of it.

For users who already hold stablecoins (crypto-native users, businesses with stablecoin treasury accounts, recipients in remittance corridors), the on-ramp step disappears. In those cases, the payment really is as fast and cheap as advertised. The gap between promise and reality narrows as the user gets closer to the blockchain layer.

How the Peg Holds (and When It Doesn't)

Every stablecoin makes the same basic promise: one token equals one dollar. But that promise is not enforced by any automatic mechanism or government guarantee. It is maintained through economics.

For fiat-backed stablecoins like USDC and USDT, the peg works through a mint-and-redeem arbitrage cycle. When demand pushes the stablecoin's market price above $1.00, authorized participants (large institutional traders with direct relationships to the issuer) deposit dollars and mint new tokens, increasing supply and pushing the price back down. When the price drops below $1.00, those same participants buy tokens at a discount and redeem them with the issuer for exactly $1.00 worth of reserves, reducing supply and pushing the price back up.

This cycle depends on two things: the reserves actually existing, and the redemption process actually working. When both conditions hold, the peg is remarkably stable. USDC and USDT have traded within a fraction of a cent of $1.00 for the vast majority of their existence.

When either condition fails, the consequences are severe. In May 2022, TerraUSD (UST), an algorithmic stablecoin with no fiat reserves, lost its peg and collapsed to near zero, wiping out roughly $40 billion in value. In March 2023, USDC itself temporarily dropped below $0.88 when Silicon Valley Bank (which held a portion of Circle's reserves) failed, triggering a brief panic about reserve access. USDC recovered within days once the banking situation was resolved, but the episode exposed how dependent fiat-backed stablecoins are on the traditional banking system they claim to improve upon.

The Brookings Institution has noted that fiat-backed stablecoins share structural similarities with money market funds, which means they carry similar contagion risks: a rush of redemptions can force the sale of underlying assets, which pushes down their value, which triggers more redemptions. The GENIUS Act addresses this by requiring 1:1 reserves in liquid assets (cash, Treasuries, government money market funds), monthly disclosure of reserve composition, and prohibition on rehypothecation (using reserve assets as collateral for other activities).

Choosing a Blockchain for Payments

Stablecoins exist on multiple blockchains simultaneously. USDC, for example, operates on Ethereum, Solana, Base, Polygon, Arbitrum, and others. The same token, representing the same dollar, behaves differently depending on which chain carries it. For payments, the chain choice matters because it directly affects speed, cost, and the ecosystem of tools available to process the transaction.

Ethereum remains the settlement layer of choice for high-value and institutional transactions because of its deep liquidity and long track record. But for everyday payments, its fees are a problem. Sending $50 in USDC on Ethereum can cost more in gas fees than the value of the transaction itself during peak congestion. That is why most DeFi activity increasingly routes through Layer 2 networks that inherit Ethereum's security while offering dramatically lower costs.

Solana has gained payment-specific traction because Visa chose it for USDC settlement, validating its speed and reliability for institutional use. Tron, despite receiving less attention in Western markets, processes a disproportionate share of global stablecoin volume, particularly USDT transfers in remittance corridors across Asia, Africa, and Latin America. In some regions, Tron-based USDT is the default way people access dollar-denominated value.

The practical takeaway: the "stablecoin is faster and cheaper" claim depends entirely on which chain the payment runs on. A USDC transfer on Ethereum during high traffic can cost more and take longer than a standard bank wire. The same transfer on Solana or a Layer 2 settles in seconds for fractions of a penny.

Where Stablecoin Payments Still Get Stuck

The speed and cost advantages are real. But stablecoin payments come with failure modes that traditional payments handle differently, and understanding those failure modes matters if you are going to use or evaluate this infrastructure seriously.

On-ramp and off-ramp availability. The blockchain itself operates globally and around the clock. But the fiat gateways that feed into it and drain out of it are uneven. In the U.S. or EU, converting dollars or euros to USDC is straightforward through regulated exchanges and payment providers. In many developing countries, where stablecoins would arguably provide the most value, off-ramp infrastructure is sparse, fees are higher, and regulatory uncertainty makes providers cautious. The IMF's 2025 stablecoin report noted that widespread adoption depends on scalable and reliable on-and-off-ramp infrastructure, particularly in emerging markets.

Chain congestion and variable costs. Gas fees on Ethereum are not fixed. They spike during periods of high network demand, which means the cost of a stablecoin transfer can change significantly between the moment you initiate it and the moment it confirms. During major market events, fees can increase tenfold within hours. Layer 2 networks and alternative chains mitigate this, but they introduce their own complexity: the recipient needs to be on the same network, or the payment requires a bridge (which adds cost, time, and risk).

Depeg risk. While major stablecoins have maintained their peg through most conditions, the risk is not zero. A major issuer facing a reserve shortfall, a regulatory freeze on reserves, or a systemic banking crisis affecting custodian banks could temporarily or permanently break the peg. The GENIUS Act's reserve and disclosure requirements reduce this risk for compliant issuers, but they do not eliminate it entirely.

Custodial risk. If you hold stablecoins on an exchange or through a custodial wallet provider, you face the same counterparty risk as holding assets in any financial institution. The spectrum of centralization applies here: the stablecoin transaction may be decentralized, but the on-ramp, off-ramp, and custody layers often are not.

Who Makes Money When You Pay With Stablecoins

One of the least discussed aspects of stablecoin payments is the economics of the infrastructure itself. Understanding who profits and where helps explain why major financial institutions are racing to participate.

Issuers earn interest on reserves. This is the largest and most profitable layer. When you buy $1,000 of USDC, Circle takes your $1,000 and invests it primarily in U.S. Treasuries and cash equivalents. The stablecoin you receive does not pay interest (the GENIUS Act explicitly prohibits this). Circle keeps the yield. At current short-term Treasury rates, managing $75 billion in USDC reserves generates billions in annual revenue. Tether, with over $180 billion in reserves, reported more than $10 billion in profit for 2025 alone. Stablecoin issuance has become one of the most capital-efficient businesses in finance.

Infrastructure providers earn integration fees. Companies like Bridge (now owned by Stripe), BVNK, and Fireblocks provide the technical layer that connects stablecoin rails to existing payment systems. They handle wallet orchestration, compliance screening, multi-chain routing, and fiat conversion. These providers charge per-transaction fees or platform subscription fees, and according to Edgar, Dunn & Company's analysis, they may ultimately capture more economic value than the issuers themselves because they control the integration, compliance, and liquidity layers.

On-ramp and off-ramp operators earn conversion spreads. Exchanges and payment providers that convert between fiat and stablecoins charge fees for the service. These range from minimal (Stripe charges roughly 1.5% for stablecoin payments) to significant (some emerging market off-ramps charge 3-5%). In remittance corridors, even these fees represent a substantial improvement over the traditional average of 6.5%.

Blockchain validators earn network fees. Every stablecoin transfer pays a gas fee to the network's validators or block producers. On Ethereum, these fees fund the validator set. On Solana, they compensate validators for processing transactions. On Tron, they go to super representatives. These fees are typically the smallest component of the total cost, ranging from fractions of a cent on Solana to several dollars on Ethereum.

What Comes Next

Stablecoin payment infrastructure is not finished. Several structural developments are still playing out that will determine whether this remains a crypto-adjacent tool or becomes a genuine component of mainstream finance.

The GENIUS Act's implementation rules are still being finalized. Federal and state regulators have until July 2026 to publish detailed guidance on reserve standards, foreign issuer requirements, and tax treatment. How strictly these rules are enforced will shape which issuers can operate in the U.S. and on what terms.

J.P. Morgan projects the stablecoin market could reach $500 to $750 billion in the coming years. Standard Chartered's forecast is more aggressive at $2 trillion by 2028. Both estimates assume continued regulatory clarity, institutional adoption, and expansion of payment use cases beyond crypto-native users.

The competitive landscape is also shifting. Banks are exploring their own stablecoin issuance (JPMorgan's Kinexys platform already enables institutional transfers on a permissioned blockchain). PayPal is paying yield on its PYUSD stablecoin. The Wharton Stablecoin Toolkit, published in February 2026, noted that well over a hundred stablecoins are now in circulation, with significant variation in how they work, what risks they carry, and what they are useful for.

For individual users and businesses evaluating stablecoin payments, the key question is not whether the technology works (it does), but whether the specific infrastructure around it, including on-ramps, off-ramps, compliance tools, and custodial solutions, is mature enough for their use case. In developed markets with strong banking infrastructure, the advantage over existing payment rails is often marginal for domestic transactions but significant for cross-border ones. In developing markets with limited banking access, stablecoins offer something genuinely new: access to dollar-denominated value that moves without requiring a bank account.

The technology layer is largely solved. The regulatory layer is catching up. The infrastructure layer, particularly the fiat gateways that connect stablecoins to the real economy, is where the next phase of development will determine whether stablecoin payments go from trillions in crypto-native volume to becoming a standard option alongside cards, wires, and real-time payment systems.