Blockchain payments explained: how stablecoins move money without correspondent banks

A blockchain payment moves value by transferring a digital token, usually a dollar stablecoin like USDC or USDT, on a public blockchain instead of passing instructions from bank to bank. For businesses it almost always sits between two ordinary bank transfers: dollars go in on one side, the stablecoin crosses the border in seconds to minutes, and local currency comes out on the other. Neither side has to hold crypto.

The old way is still expensive. The World Bank's Remittance Prices Worldwide put the global average cost of sending $200 at 6.36% in the third quarter of 2025, more than double the 3% target set for 2030. That's a consumer benchmark, not a B2B one, but the cost comes from the same places: correspondent hops, FX markups, and capital parked in foreign accounts.

Businesses have noticed. Artemis data, analyzed by McKinsey in early 2026, estimated real-world stablecoin payments at about $390 billion a year based on late-2025 activity. Business-to-business payments made up about $226 billion of that, roughly 60%, up 733% year over year.

How are blockchain payments different from cards and correspondent banking?

All three move money. They differ in what actually travels.

• Card networks move authorization messages. The merchant gets a promise at checkout, and the money settles a day or two later through the acquirer, minus a percentage fee. Chargebacks stay open for months.
• Correspondent banking moves payment messages (SWIFT MT103 or ISO 20022). The money itself moves by debiting and crediting accounts that banks keep with each other, called nostro and vostro accounts. A cross-border payment can pass through one or more intermediary banks, each of which may take a fee, and each of which works banking hours.
• Blockchain payments move the asset and the record together, on one shared ledger. There's no chain of banks updating separate books. The transfer runs 24/7, and once it's final, nobody can reverse it.

How does a blockchain payment work, step by step?

Almost every business blockchain payment follows the same pattern: fiat on-ramp, stablecoin transfer, fiat off-ramp. Take a US company paying a $20,000 invoice to a supplier in Mexico.

1. Fiat in. The US company sends dollars by ACH, wire, or RTP to its payment provider, often to a dedicated account number in its own name.
2. On-ramp. The provider converts the dollars to USDC at the rate locked in a quote.
3. Stablecoin transfer. The USDC moves on a blockchain such as Polygon, Base, or Stellar. This leg takes seconds.
4. Off-ramp. The provider converts the USDC into Mexican pesos at the quoted rate.
5. Fiat out. The pesos land in the supplier's bank account over SPEI, Mexico's instant payment system, usually within minutes.

The supplier sees a peso deposit from a named sender. The US company sees a dollar debit and a confirmation. Neither touched the blockchain. The API-level version of this flow, with quote expiry and webhooks, is in how a stablecoin payment works.

How do settlement time and cost compare with SWIFT?

Speed first. Swift reported in October 2024 that 90% of cross-border payments on its network reach the recipient's bank within an hour. The catch is the last step: only 43% reach the end customer's account within an hour, because the receiving bank still has to process and credit it. Weekends and cut-offs push the rest to the next business day or later. The Financial Stability Board, which tracks the G20's 2027 targets for faster and cheaper cross-border payments, said in October 2025 that the targets are unlikely to be met on time.

A blockchain payment's middle leg settles in seconds on Stellar, Solana, or Polygon, and in about 13 minutes to full finality on Ethereum, at any hour. The end-to-end time is then set by the payout rail. Instant rails like Pix, SPEI, and RTP finish in seconds. ACH and SWIFT still take business days.

Cost works the same way. A SWIFT payment can collect a sending fee, intermediary deductions, a receiving fee, and an FX markup that's rarely shown as a line item. A blockchain payment replaces the intermediary hops with one on-chain transfer. What's left is the network fee (usually cents on Polygon, Solana, Stellar, and Base), the provider's fee, and the FX spread, which a good provider shows in the quote before you send.

What are the trade-offs?

Blockchain payments aren't free of friction. They move it.

• Finality cuts both ways. A confirmed transfer can't be recalled. Mistakes have to be prevented up front, which is why good providers lock the amount and destination in a quote before anything moves.
• The bank legs remain. Fiat still enters and leaves over bank rails, with their own cut-offs and review times. A blockchain doesn't make ACH faster.
• Compliance still applies. Every sender and recipient needs KYC or KYB, and payments are screened against sanctions lists. That work moves to the provider, but it doesn't disappear.
• Regulation varies by country. Stablecoin rules differ between the US, the EU, Brazil, and everywhere else. Your provider needs to be licensed where it operates.

For a domestic payment on a fast local rail, like Pix inside Brazil or RTP inside the US, a blockchain adds nothing. The advantage shows up when money crosses a border or a currency.

How does BlindPay handle blockchain payments?

BlindPay is a stablecoin payments API that hides the blockchain entirely if you want it to. Every payment settles through stablecoins, but in the API's Abstracted flavor you work only with bank concepts: virtual accounts for money in, payins for deposits, and payouts to bank accounts for money out. BlindPay picks the network and moves the stablecoins behind the scenes. Nobody on your team manages a wallet or chooses a chain.

Payouts go out over Pix, SPEI, Transfers (Argentina), ACH COP (Colombia), ACH, wire, RTP, SEPA, and SWIFT (POBO/COBO) to 100+ countries, with no pre-funding. KYC and KYB run inside the API. Teams that do want chain-level control, their own wallets and their choice of network, use the Advanced flavor of the same API.

What to do next

Price one real payment both ways. Take a supplier invoice you paid by wire last month, add up what actually arrived versus what you sent, and compare it with a live quote for the same amount and currency. The payout quickstart gets a development instance quoting in minutes, and the supported countries list shows which corridors are live.

This article is for general information only and is not legal, tax, or financial advice.