Merchants comparing stablecoin checkout against Visa rarely get a clean answer because the two rails charge for different things. Visa bundles network fees, interchange, and acquirer markup into one per-transaction cost. A stablecoin checkout splits cost into onchain gas, processor markup, and (optionally) a fiat off-ramp. This article puts both stacks on the same table, using primary sources for every fee figure: Federal Reserve Bank of Kansas City research on credit interchange, the Federal Reserve's 2023 Regulation II report on debit, and live network data for Base, Polygon, and Solana.
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Visa charges merchants a blended rate that combines interchange (paid to the issuing bank), network assessment (paid to Visa), and acquirer or processor markup. Stablecoin checkouts charge an onchain gas fee paid in the chain's native token, plus a processor fee if a third party (Coinbase Commerce, BitPay, Crossmint) handles invoicing or fiat conversion. Direct wallet-to-wallet payments skip the processor entirely.
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The Federal Reserve Bank of Kansas City's research on credit-card interchange puts typical credit-card interchange at roughly $0.50 to $0.80 per transaction once network fees and acquirer markup are layered on, with merchant discount rates that vary by merchant category, ticket size, and acquirer agreement. The Federal Reserve's 2023 Regulation II report places average debit interchange at $0.22 to $0.24 per transaction for covered (regulated) issuers. Reg II governs debit only — it does not cap credit interchange. Conflating the two is a common attribution error in payments writing.
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A $50 ticket is a useful baseline because it sits near the average US card transaction size and is large enough to dwarf onchain gas on every major payment chain. On Visa credit, the per-transaction interchange floor reported by the Kansas City Fed ($0.50 to $0.80) plus network and acquirer markup typically lands well above a dollar all-in. On Visa debit, the regulated interchange of $0.22 to $0.24 reported in the Federal Reserve's 2023 Regulation II report is the dominant cost, plus a smaller processor markup. Stablecoin rails on Base or Solana cost cents.

The card-rail figures come from public Visa interchange schedules and Federal Reserve research. The stablecoin gas figures use median fee data from the chains' own block explorers; they fluctuate with network demand and should be re-checked before launch.
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Stablecoin transactions reach onchain finality in seconds (Solana, Base) to a few minutes (most rollups during heavy load). That is genuinely faster than Visa's T+1 to T+2 settlement. The honest caveat is that "settled onchain" is not the same as "spendable dollars in your bank account." If a merchant wants USD in a checking account, the off-ramp adds time.
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Three off-ramp paths most merchants use today:

For merchants whose pain point is working capital trapped in T+2 batch settlement, stablecoins are a real improvement. For merchants who use Visa's float as a feature (deposit timing, dispute reserve), the speed benefit is smaller.
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Stablecoin transactions have no chargeback mechanism. Once a payment is confirmed onchain, the merchant keeps the funds. There is no issuer to file a dispute through, no representment process, and no card-network arbitration. For high-fraud-rate categories (digital goods, gift cards, travel), this is genuinely valuable.
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The flip side is that customer-protection costs shift from the issuer back to the merchant. A buyer who paid in USDC and received a defective product cannot reverse the payment unilaterally. Merchants who want chargeback parity have to build their own refund and dispute workflow, often using escrow contracts or processor-level dispute features. Coinbase Commerce, for example, supports refunds but not chargebacks; the merchant initiates the return manually.
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The right framing is not "stablecoins eliminate fraud cost." It is: stablecoins move fraud cost from interchange (priced into every transaction) to operational policy (priced into refund and support staffing). Merchants in low-dispute categories come out ahead. Merchants with high legitimate dispute rates need to model the swap carefully.
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Visa's global acceptance is the strongest argument for keeping it as a primary rail. The network operates in 200+ countries and handles FX automatically, with merchants paying a cross-border interchange uplift plus a 1% network assessment on international transactions per Visa's published schedules. The buyer's issuer also charges a foreign-transaction fee, but that lands on the cardholder, not the merchant.
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Stablecoin payments avoid network-level FX entirely because USDC and USDT are denominated in dollars on every chain. A buyer in Argentina pays the same USDC the merchant receives. The complexity moves to the buyer: they need a way to acquire stablecoins (centralized exchange, fiat on-ramp, peer-to-peer market), and the merchant needs a wallet or processor that accepts incoming payments. For cross-border flows where Visa's effective cost stacks domestic interchange with cross-border uplift and the network's International Service Assessment, stablecoins are usually the cheaper rail. For domestic US consumer checkout, the buyer-side onboarding friction is still the limiter.
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Visa's tokenization and card-on-file mechanics make recurring billing trivial: the issuer authorizes a stored credential, the merchant runs a fresh charge each billing cycle, and the card network handles credential lifecycle (replacements, expirations) through Visa Account Updater. Subscription revenue at scale runs on this infrastructure.
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Stablecoin recurring billing is possible but requires more engineering. The common patterns are EIP-2612 permit signatures (the buyer signs an offchain authorization the merchant submits onchain), smart-contract subscription primitives (Sablier, Superfluid, custom escrow), or session-key patterns on chains that support account abstraction. None of these have the maturity or uniformity of card networks. For SaaS billing today, most teams keep Visa as the primary subscription rail and offer stablecoins as a one-time alternative for invoices, large payments, or international customers.
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Three merchant profiles where stablecoin checkout consistently beats Visa on total cost:

For low-ticket domestic consumer checkout where the buyer expects to tap a card, Visa is still the right default. The cost difference on a $20 coffee transaction is real but small in absolute terms, and the buyer-side onboarding friction (wallet, on-ramp) outweighs the merchant savings.
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Card-rail fee figures are sourced from the Federal Reserve Bank of Kansas City's research on credit-card interchange (typical $0.50–$0.80 per credit transaction) and the Federal Reserve's 2023 Regulation II report on debit interchange ($0.22–$0.24 average for regulated issuers). Reg II governs debit only and does not apply to credit-card interchange.
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Stablecoin gas figures use median fee data from Basescan, Solscan, and Polygonscan as of May 2026. Onchain costs vary with network demand; merchants planning launch should pull live medians the week before. Processor pricing references Coinbase Commerce, BitPay, and Stripe's published merchant documentation.
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