What is PayFi? How stablecoins replace wire transfers

PayFi: The rise of programmable payment infrastructure

Most people still believe that cryptocurrency payments are just buying coffee with Bitcoin. The real change is more low-key and far-reaching: stablecoins now pay more annually than many traditional payment networks, and a new category called PayFi is building programmable payment infrastructure at this scale. This guide will explain what PayFi is, how its underlying mechanisms work, and why sending a dollar on Solana can arrive in seconds and cost extremely little, while sending the same dollar over SWIFT takes days and costs US$25 to US$50, which is crucial.

Summary

PayFi (short for payment finance) is the practice of applying decentralized financial protocols to real-world payments. It combines stablecoin settlement with programmable logic such as streaming payments, conditional custody, and revenue-driven expenditures.

In 2024, the total amount of transfers on the stablecoin chain will exceed US$27 trillion, exceeding the combined amount of Visa and Mastercard, although this comparison requires qualifications because stablecoin transaction volume includes DeFi activities, fund management and consumer payments.

PayFi's core argument is to eliminate correspondent banks-the chain of intermediate banks that make cross-border wire transfers slow and expensive, and replace them with direct stablecoin settlement on the public blockchain.

Agreements such as Huma Finance, Superfluid and Sablier represent different paths for PayFi: Huma uses on-chain capital to provide financing for real payment flows, Superfluid implements continuous payment flows per second, and Sablier provides token ownership and payroll services.

The regulatory framework is being followed up. The EU's MiCA regulations and proposed stablecoin legislation in the United States will establish licensing requirements for stablecoin issuers, which could either legalize PayFi by providing regulatory clarity or limit its development by imposing compliance costs.

When Lily Liu, Chairman of the Solana Foundation, introduced the term PayFi at the Token2049 conference in September 2024, she revolved around a specific concept: the time value of money. The idea is that if your stablecoin earns revenue in the DeFi protocol, you can spend those revenue today without using the principal. Buy a cup of coffee with the interest you earn overnight on your USDC. Pay the subscription fee with the proceeds from your savings. Principal never moves, only income flows.

This framework has attracted attention, but PayFi has gone beyond the concept of the time value of money. It now covers any payment infrastructure built on stablecoins and smart contracts, from cross-border payroll to trade finance to merchant point-of-sale settlement. The common thread is to replace the slow, expensive, and intermediate-rich payment track with programmable stable currency flows.

Why wire transfers cost so high

To understand what PayFi has replaced, it will help first understand who it has replaced.

Domestic wire transfers in the United States range from $25 to $30 and are settled the same day through the Fedwire system. International wire transfers cost between $30 and $50, take between 1 and 5 business days, and go through a series of correspondent banks, each of which charges a fee.

Costs come from the agent bank system. When you send money from a bank in America to a recipient bank in the Philippines, your bank rarely has a direct relationship with a bank in the Philippines. Instead, payments are made through one or more intermediary banks that have accounts with both institutions. Each intermediary bank charges fees, conducts compliance checks, and increases processing time.

SWIFT is the messaging network that coordinates international transfers and does not actually transfer funds. It just sends instructions between banks. The actual settlement takes place through a proxy account, which is why even if the SWIFT message itself arrives in seconds, the transfer can take days.

The global remittance market (where migrant workers send money home) best illustrates the cost issue. The World Bank reports that the global average cost of sending $200 is approximately 6.2%, or a handling fee of $12.40. For some regions, especially the sub-Saharan African route, the cost exceeds 8%. These costs fall disproportionately on the people least able to afford them.

How stablecoin settlement works

Stable currency transfers eliminate most intermediate links. Sending USDC from one wallet to another on Solana costs less than a penny and settlement is completed in two seconds. Since stablecoins trade at a fixed exchange rate, price execution is not affected by slippage. The sender does not need a bank account. The recipient also does not need a bank account. There is no correspondent bank taking a commission from it.

Settlement is final in the blockchain sense: Once the transaction is confirmed, the USDC is in the recipient's wallet and is irreversible. This is different from wire transfers, the finality of settlement depends on the clearing system and can theoretically be reversed in certain controversial scenarios.

There are three levels of infrastructure to achieve this:

The stablecoins themselves

USDC (issued by Circle) and USDT (issued by Tether) are the main payment stablecoins. Both hold reserves denominated in dollars and dollar equivalents. Circle issues monthly certificates of its reserves through independent accounting firms. Tether publishes a quarterly reserve report. The credibility of a stablecoin depends entirely on the issuer's reserves and governance, not on the blockchain it runs on.

Blockchain network

stablecoins exist on multiple chains. USDC runs on networks such as Ethereum, Solana, Base, Avalanche, and Arbitrum. The choice of networks affects transaction speeds, costs, and the ecosystem of available applications. Solana and Base offer the lowest fees for payment-size transactions, while Ethereum provides the deepest DeFi mobility.

Deposits and withdrawals channels

Converting between legal tender and stablecoins still requires a regulated financial intermediary: an exchange, licensed money transfer institution or banking partner. This is the bottleneck. Transfers online are fast and cheap, but transferring dollars into and out of the stablecoin system involves KYC checks, bank transfers and processing delays, which reintroduce some of the friction PayFi aims to eliminate.

What the PayFi protocol actually builds

PayFi is not a single protocol, but a type of application that uses stablecoins and smart contracts to create payment infrastructure that is difficult or impossible to build on traditional tracks.

Trade Finance and Accounts Receivable

Huma Finance is the most prominent PayFi protocol based on total locked value. Huma allows companies to use on-chain capital to finance real-life payment flows. Payment companies that process cross-border transactions can use Huma to obtain working capital backed by their accounts receivable and receive stablecoins today to offset the amount they will collect in 30 or 60 days. Chain capital providers earn income from the interest on these advances. This is a traditional factoring business, but the capital comes from the DeFi pool rather than the bank, and the settlement is done through stablecoins rather than correspondent banks.

Streaming payment

Superfluid enables a continuous, per-second payment flow. Instead of paying employees $5000 at the end of the month, employers can pay $0.0019 per second continuously. Employees 'balances increase in real time and can be withdrawn at any time. The scope of this model goes beyond payroll: subscription payments, lease agreements, and service fees can all be constructed as a continuous stream rather than discrete monthly fees.

Token attribution and distribution

Sablier provides locking and attribution schedules for token distribution. Although not a payment protocol in the traditional sense, Sablier's linear and dynamic attribution curve solves practical money management issues for crypto projects that require the distribution of tokens to employees, investors, and community members over time.

Merchant acceptance

Several payment processors now allow merchants to accept stablecoin payments and settle in local fiat currency. Merchants have never come into contact with cryptocurrencies. Customers pay in USDC or USDT, the processor converts it into legal tender, and merchants receive U.S. dollars, euros or pesos in their bank accounts. The conversion occurs at the processor level, and merchants 'accounting treatment treats it as an ordinary card-like transaction.

Cross-border salary

Companies with distributed international teams face a continuing problem: Paying contractors in different countries through traditional banks is slow, expensive and complex to manage. PayFi payroll solutions allow employers to fund smart contracts with stablecoins and distribute payments to contractors around the world, who then convert them to local currency. Instead of initiating separate wire transfers to each country, employers only need to send a transaction. Some platforms now offer this service and have tax reports and compliance documents built-in in the jurisdictions they support.

The concept of the time value of money

As Lily Liu explains, the original PayFi argument focused on the specific application of income-based stablecoins.

The following is the algorithm. Suppose a user holds US$10,000 in USDC and deposits a loan agreement with an annualized rate of return of 5%. The position generates approximately $1.37 in interest per day. PayFi apps allow users to spend the benefits they will generate tomorrow today rather than waiting for interest compound. The principal remains unchanged and continues to generate income.

In practice, this requires an agreement that can advance expected returns, absorb the risk of changes in yields or failure of lending agreements, and settle payments in real time. The user experience is similar to a credit card with no interest charges, no principal withdrawals, fully funded by the return on its deposited assets.

This model is effective as long as three conditions are met: yields remain positive, stablecoins maintain their anchor, and lending agreements remain solvent. If any of these conditions fails, the payment flow is interrupted. Users are not spending "free money". What they spend is the return on capital that bears smart contract risk, interest rate risk, and anchor risk.

Algorithm: stablecoin transfers versus wire transfers

When you compare specific payment scenarios on two tracks, the cost advantages of stablecoin settlement become specific.

Consider a small U.S. business paying US$5,000 a month to a Vietnam supplier.

Through traditional banks, wire transfers are a bank fee of US$45 per transaction. Intermediate correspondent banks charge an additional $15 to $25. Foreign exchange costs at the receiving end are 1% to 2% of the transfer amount, an increase of US$50 to US$100. Total cost per transfer: approximately $110 to $170. Payments take two to four working days to arrive and suppliers cannot use funds until the receiving bank processes and accounts.

Through stablecoin settlement, the sender converts US$5,000 to USDC through an exchange or deposit service provider, paying a conversion fee of 0.1% to 0.5%(US$5 to 25). Online transfers on Solana cost less than $0.01 and settle in seconds. The recipient converts the USDC into VND through a local exchange or withdrawal service and pays a further 0.5% to 1%(US$25 to US$50). Total cost: approximately $30 to $75. Payment arrives in minutes and the recipient can convert it to local currency on the same day.

Savings increase as transaction volume increases. A company that makes 50 cross-border payments per month can save US$2,000 to US$5,000 per month by switching from wire transfers to stablecoin settlements. Annually, this represents a direct cost savings of $24,000 to $60,000, plus working capital gains from receiving funds days in advance.

There are important limitations to this comparison. Stability coin settlement requires both parties to have access to a cryptocurrency exchange or regulated deposit and withdrawal services. The regulatory status of these services varies from country to country. Conversion fees at both ends may fluctuate due to local market liquidity and competition among providers.

What issues still exist with the user experience?

Transfers online are the easy part. The friction points that hinder mainstream adoption of PayFi are at both ends.

Deposit complexity

Converting fiat currencies into stablecoins requires authentication through a regulated exchange or money services business. In developed markets, this typically takes one to three working days and requires a bank account, government-issued identification and sometimes proof of address. In emerging markets, regulated gold deposit channels may not exist, or existing services may exclude users without bank accounts-which is exactly what PayFi is designed to serve.

Self-escrow burden

The recipient holding stablecoins in a self-escrow wallet is responsible for protecting his private key. Losing the key means losing funds permanently. This is not a problem that improving blockchain infrastructure can solve. This is a fundamental contradiction between the censory-resistant nature of self-custody and the safety net traditional banks provide through account recovery and fraud protection.

Regulatory fragmentation

The legal status of stablecin payments varies from country to country. Some jurisdictions regard stablecoin transfers as currency transactions and are subject to currency transfer licensing regulations. Other jurisdictions treat it as a securities transaction. Cross-border payments that are legal on both ends may encounter regulatory gray areas in the countries where the financial system is located.

Volatility denominated in local currency

Recipients in devaluing countries face conversion decisions every time they receive a stablecoin payment. Holding USDC when the local currency is weak is actually a gain. However, conversion too slowly during periods of strengthening local currencies can cause losses. This time risk does not exist in traditional wire transfers because funds arrive in local currency.

What is not covered in this article

This guide covers PayFi mechanisms, stablecoin settlement, and the economics of cross-border payments. It does not include:

Central bank digital currencies, which use different infrastructure and are issued by governments rather than private companies. CBDC and stablecoins solve similar problems, but through fundamentally different governance structures.

Cryptocurrency debit cards that convert stablecoins into legal tender at the point of sale. These are consumer products built on PayFi infrastructure, not the infrastructure itself.

The legal and tax treatment of stablecoin payments varies by jurisdiction and is subject to continued regulatory developments in most major markets.

Algorithm stablecoins, which maintain their anchor through protocol mechanisms rather than legal reserves. These have fundamentally different risk profiles and are not currently used in serious PayFi apps after TerraUSD failed in 2022.

Actual check before using PayFi protocol

Before using the PayFi app to process real funds, please verify the following points:

Check the proof of reserve of stablecoins

The USDC issues third-party certificates monthly through Grant Thornton. The USDT publishes a quarterly reserve report. If PayFi applications use stablecoins with no public or unaudited reserves, anchor stability cannot be verified.

Verify smart contract audit status

PayFi agreements that hold user funds should be audited from reputable companies rather than just informal reviews. Check that the audit is complete for the current contract version, as protocol upgrades may introduce new vulnerabilities that invalidate previous audits.

Understand the gold withdrawal path

Before sending, understand exactly how your recipient will convert stablecoins to local currencies. If a PayFi payment arrives immediately but takes five days to convert due to slow or expensive local withdrawal channels, it is no improvement over wire transfers.

Check the finality of transactions on the selected network

Different blockchains have different finality characteristics. Transactions confirmed on Solana are effectively irreversible after one to two seconds. Ethereum transactions reach probability finality in a few minutes. Some bridge and payment processors wait for multiple block confirmations before releasing funds. Understand the actual settlement time from end to end, not just the on-chain confirmation time.

Confirming regulatory status of both countries

For cross-border payments, check whether stablecoin transfers are legal in both sender and recipient jurisdictions. This is particularly important for channels involving countries with capital controls or cryptocurrency restrictions.

Matters to Watch

U.S. stablecoin legislation

The GENIUS and STABLE bills are being advanced in Congress. If passed, they would establish a licensing framework for stablecoin issuers, require reserve backing and redemption rights, and potentially restrict who can issue stablecoins pegged to the dollar. The results will significantly affect which stablecoins dominate PayFi applications and what compliance costs these applications face.

Visa and Mastercard's stablecoin integration

Both networks have announced or piloted projects to settle transactions using USDC. If traditional card networks complete their stablecoin integration, PayFi infrastructure may merge with existing merchant payment streams rather than compete with them.

Circle's IPO and public disclosure

Circle, the issuer of USDC, has applied for a U.S. IPO. Public company identity will require more detailed reserve disclosures and subject Circle to securities regulations, providing more transparency for maximum payment stablecoin support.

Bank license of stablecoin issuer

Several stablecoin issuers are seeking banking licenses or banking partnerships that would allow them to hold reserves directly at the Federal Reserve. This would eliminate counterparty risk holding reserves in commercial banks, as happened during the SVB crisis, when the USDC briefly unanchored because $3.3 billion of its reserves were trapped at that failed bank.

Withdrawal infrastructure in emerging markets

PayFi's actual effectiveness in the most important remittance channels depends on competitive withdrawal services in markets such as the Philippines, Nigeria, Mexico and India. Focus on new entrants and regulatory approvals, which will expand the availability of local currency conversions.

What is PayFi?

PayFi (short for payment finance) is the practice of applying decentralized financial protocols to real-world payment infrastructure. It combines stablecoin settlement with programmable smart contract logic to create a faster and cheaper payment system than traditional wire transfers. Examples include streaming payroll, cross-border stablecoin remittances, and revenue-driven expenditures.

What are the differences between stablecoins and regular cryptocurrencies in terms of payments?

stablecoins are pegged to a reference asset (usually the U.S. dollar), which means their value does not fluctuate like Bitcoin or Ethereum. This makes them suitable for payments because both the sender and receiver know the dollar value of the transaction when executing the transaction. Conventional cryptocurrencies expose both parties to price risk from the time of dispatch to conversion to fiat currency.

Why is wire transfer slow and expensive?

Wire transfers are slow and expensive because they are made through a chain of agent banks. Your bank rarely has a direct relationship with a receiving bank in another country, so payments go through one or more intermediary banks, each of which charges fees and introduces processing delays. SWIFT is the messaging system that coordinates international transfers. It sends instructions but does not transfer funds, which is why SWIFT messages arrive in seconds, but funds take days.

What is the concept of the time value of money in PayFi?

The time value of money in PayFi refers to the use of proceeds earned from deposited stablecoins to fund expenditures, while the principal remains unchanged. For example, a $10,000 USDC generates approximately $1.37 per day at an annualized rate of return of 5%. PayFi apps allow tomorrow's revenue to be spent today, so users can pay without having to use savings. Principal continues to compound, while the income stream supports consumption.

Is USDC supported in real U.S. dollars?

The USDC is backed by a reserve of dollar-denominated assets, including cash and short-term U.S. Treasury bonds. Issuer Circle issues reserve certificates through an independent accounting firm on a monthly basis. Reserve backing means that each USDC token can be redeemed for one dollar through Circle's redemption system, provided that the reserves remain intact and Circle remains solvent.

What happened to USDC during the SVB crisis?

In March 2023, Silicon Valley Bank collapsed, holding approximately US$3.3 billion in USDC reserves at the time. Circle disclosed its exposure on Friday, and USDC briefly fell to $0.87 before resuming after U.S. regulators announced they would guarantee SVB depositors. This incident shows that stablecoin reserves deposited in commercial banks have counterparty risks, and even stablecoins with sufficient reserves may temporarily become unanchored during a banking crisis.

What is Huma Finance?

Huma Finance is a PayFi protocol that allows companies to use on-chain capital to finance real-life payment streams. Payment companies and fintech companies that process cross-border transactions can obtain working capital backed by their accounts receivable and receive stablecoins today to offset the amount they will collect in 30 to 60 days. Capital providers in the Huma loan pool earn income from the interest on these advances.

Can stablecoin payments replace the bank accounts of unbanked people?

stablecoin wallets can provide value storage and payment functions without a traditional bank account. However, conversions between stablecoins and local cash often still require a licensed exchange, mobile money service or proxy network. Last-mile cash access issues limit PayFi's ability to completely replace banking in markets with underdeveloped digital financial infrastructure.