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Payment rails
How money actually moves between accounts, rail by rail: the Federal Reserve's Fedwire and FedNow, The Clearing House's RTP network, ACH, and the instant systems abroad — SEPA Instant, Faster Payments, PIX, SPEI, UPI, PayNow and mobile money. Speeds, hours, limits and message formats, from a team that sends and receives on these rails for its business customers every day.
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Payment rails explained: how money moves in 2026
What payment rails are and how each works: ACH, Fedwire, RTP, FedNow, cards, SWIFT, SEPA Instant, PIX, UPI and stablecoins — speed, hours, limits, costs.
Every question in this topic
Fedwire vs FedNow: what's the difference?
Fedwire settles large wires on business days; FedNow settles in seconds 24/7 up to $10M. Hours, limits, fees, volumes and when to use each in 2026.
What is FedNow? The Federal Reserve's instant payment service
FedNow is the Federal Reserve's 24/7 instant payment service: seconds to settle, up to $10M per payment, 1,800+ banks. How it works, costs, limits, safety.
What is an RTP payment? The Real-Time Payments network explained
RTP is The Clearing House's instant payment network: final payments in seconds, 24/7, up to $10M each. How it works, limits, request for payment, safety.
RTP vs FedNow: what's the difference between the two instant rails?
RTP and FedNow both settle in seconds, 24/7, up to $10M. Who runs each, how they settle, volume, reach, fees and which a business should use in 2026.
What is Fedwire? How the Federal Reserve's wire system works
Fedwire is the Federal Reserve's system for same-day, final wire transfers: $4.59 trillion a day in 2025. How it works, hours, cutoffs, ISO 20022, fees.
What is an ACH transfer? How ACH payments work
ACH moves 35 billion US payments a year in batches: 1–3 business days, or same day up to $1M. How ACH works, windows, returns, costs and when to use it.
What is SEPA Instant?
SEPA Instant moves euros between accounts in 41 countries in 10 seconds or less, 24/7. How it works, limits, fees, Verification of Payee and US access.
What is Faster Payments?
Faster Payments moves pounds between UK accounts in seconds, 24/7, up to £1M. How it works, limits, Confirmation of Payee, fraud refunds and US access.
What is a Pix payment?
Pix moves reais in seconds, 24/7, by Pix key or QR code. How Brazil's instant system works, limits, fees, MED refunds and paying Brazil from the US.
What is SPEI?
SPEI is Banco de México's 24/7 system for instant peso transfers by 18-digit CLABE. How it works, CEP receipts, limits, fees and paying Mexico from the US.
What is a UPI payment?
UPI moves rupees in seconds, 24/7, by UPI ID or QR code: 24B payments a month in 2026. How it works, limits, charges, safety and paying India from the US.
What is PayNow?
PayNow sends Singapore dollars in seconds, 24/7, to a mobile number, NRIC or UEN over FAST. How it works, limits, scam safeguards and paying from the US.
What is mobile money?
Mobile money is a phone-number wallet run by a telecom or e-money firm; over $2 trillion moved in 2025. How it works, limits, risks and paying from the US.