What are the main US payment rails?

Five rails carry nearly all US dollar payments between banks: Fedwire, the Federal Reserve's real-time gross settlement system for high-value transfers; CHIPS, a private-sector netting system for large payments run by The Clearing House; ACH, the batch network used for payroll, bills, and business payments; RTP, The Clearing House's 24/7 instant payment network; and FedNow, the Federal Reserve's instant payment service launched in 2023.

What is the difference between Fedwire and CHIPS?

Both move large-value dollar payments between banks, but they settle differently. Fedwire settles each payment one by one, in full, in central bank money, and handled about $4.6 trillion a day in 2025. CHIPS nets payments against each other before settling: in 2025 it settled about $2 trillion a day using roughly $96 billion in funding. Fedwire is final the moment a payment settles; CHIPS achieves finality through its netting and prefunding design.

What is the difference between RTP and FedNow?

They do the same job through different operators. RTP, run by The Clearing House, has operated since 2017 and now carries a $10 million transaction limit. FedNow, run by the Federal Reserve, launched in July 2023, had signed up more than 1,500 financial institutions by the end of 2025, and has raised its network transaction limit to $10 million. Both settle individual payments in seconds, around the clock, with immediate finality. A bank can join either or both.

Why do US banks still use ACH if instant rails exist?

Cost and habit, in that order. ACH batches millions of payments and clears them at a tiny per-item cost, which suits payroll, subscriptions, and supplier runs where nobody needs the money in five seconds. The network moved 35.2 billion payments worth $93 trillion in 2025. Instant rails are growing quickly, but they are newer, and many corporate systems are built around ACH files and its predictable schedule.

Do any US payment rails work internationally?

Not directly. All five rails are domestic: they move dollars between US-regulated institutions. A cross-border payment uses them only for the domestic legs, for example Fedwire or CHIPS moving dollars between correspondent banks in New York while the international leg travels by SWIFT message. That seam between domestic rails and cross-border messaging is where most delay and cost in international payments accumulates.

Explainers

US payment rails: Fedwire, CHIPS, FedNow, RTP, and ACH explained

How the five main US payment rails work, what each costs and settles, how they differ, and how they combine in the domestic leg of a cross-border payment.

The United States moves money between banks over five main rails: Fedwire and CHIPS for high-value payments, ACH for batched everyday payments, and RTP and FedNow for instant payments. Each was built for a different job, settles on a different cycle, and carries a different cost, and a treasury or payments team choosing between them is really choosing between speed, cost, and finality.

Here is the map, rail by rail.

Rail	Operator	Settlement	Speed	Typical use
Fedwire	Federal Reserve	Gross, per payment, central bank money	Seconds, business hours	High-value, time-critical transfers
CHIPS	The Clearing House	Multilateral netting, prefunded	Intraday, business days	Large-value, mostly cross-border dollar legs
ACH	Nacha rules, Fed and TCH operators	Batched, net	Same day to 2 days	Payroll, bills, B2B runs
RTP	The Clearing House	Gross, per payment, 24/7	Seconds, always on	Instant disbursements, B2B
FedNow	Federal Reserve	Gross, per payment, 24/7	Seconds, always on	Instant payments via Fed-connected banks

Fedwire: the anchor rail

Fedwire is the Federal Reserve’s real-time gross settlement system. Every payment settles individually, immediately, and finally, in central bank money. There is no netting and no waiting: when a Fedwire payment settles, the receiving bank holds reserves at the Fed, and the transaction cannot be unwound. That is why it anchors everything else. In 2025 the service originated 217 million transfers and averaged about $4.6 trillion in daily value, the largest of any US rail.

The trade-offs are hours and cost. Fedwire runs on business days, not weekends, and it prices per transfer at levels that make sense for a $5 million payment, not a $50 one.

CHIPS: netting the big flows

CHIPS, run by The Clearing House, handles much of the large-value traffic that does not need Fedwire’s payment-by-payment settlement, including the dollar legs of most cross-border flows. Instead of settling each payment in full, CHIPS continuously nets payments between its participants against prefunded positions. The efficiency is striking: in 2025 it settled an average of $2.01 trillion a day, across roughly 616,000 daily transactions, using about $96 billion in funding, where a pure gross-settlement approach would have required an estimated $442 billion.

That efficiency is the argument for netting in one number. The constraint is membership: CHIPS has 42 direct participants, so most banks reach it through a correspondent, which is one reason the correspondent chain persists inside dollar clearing.

ACH: the batch workhorse

ACH is not fast, and that is the point. Payments are collected into files, processed in batches by the two network operators, and settled as net positions. The per-item cost is measured in fractions of a cent at scale, which is why payroll, government benefits, subscription debits, and supplier payments run on it. The network carried 35.2 billion payments worth $93 trillion in 2025, including 8.1 billion business-to-business payments. Same Day ACH, which adds multiple intraday settlement windows with a $1 million per-payment limit, grew to 1.4 billion payments worth $3.9 trillion in the same year.

The cut-off time discipline of ACH files, and the one-to-two-day standard cycle, shape how most US businesses experience payments: cheap, reliable, and never immediate.

RTP: instant payments, private operator

RTP is The Clearing House’s instant rail, live since 2017. Payments settle one by one, around the clock, with immediate finality, and the network raised its transaction limit tenfold to $10 million in early 2025, which pulled real corporate flows onto it: in the second quarter of 2026 the network carried 142 million transactions worth $576 billion. Payments are credit-push only, which removes an entire class of debit fraud, and the message set is ISO 20022 native.

FedNow: instant payments, public operator

FedNow is the Federal Reserve’s answer to the same need, launched in July 2023. It settles instantly in central bank money and inherits the Fed’s reach: more than 1,500 financial institutions across all 50 states had joined by the end of 2025, and the network transaction limit has been raised to $10 million, matching RTP. For banks, the practical question is not RTP or FedNow but how to manage liquidity on rails that never close, since instant settlement at 3 a.m. on a Sunday requires funded positions at 3 a.m. on a Sunday.

Where the rails meet the border

All five rails stop at the border. They move dollars between US institutions; they do not know what a euro is. An international payment therefore splits into legs: a SWIFT message instructs banks across the chain, and the actual dollar movement happens on Fedwire or CHIPS between correspondents in New York, while the foreign leg settles on that country’s domestic rails. Every seam between those legs adds a cut-off, a fee, and a reconciliation step, which is why international payments still take days while domestic ones take seconds.

Where Frame fits

Frame is the settlement layer for global finance: one integration to orchestrate payments at scale across fiat rails, stablecoins, and tokenized deposits, with compliance enforced on every transaction and settlement in seconds instead of days.

The US rails above are the fiat foundation of that picture, and they work well inside their borders. What Frame addresses is the seam this page ends on: for banks, payment providers, exchanges, platforms, and enterprises, Frame routes each payment across whichever rail fits the corridor, the counterparty, and the policy that governs it, whether that is a domestic fiat rail, a regulated stablecoin, or a tokenized deposit. Frame’s Rules Engine evaluates every transaction against its governing policies inside settlement, so the compliance checking that currently happens at every seam happens once, as a condition of settlement itself.

See how a rail-neutral settlement layer works: the Frame Blueprint.

Common questions

What are the main US payment rails?: Five rails carry nearly all US dollar payments between banks: Fedwire, the Federal Reserve's real-time gross settlement system for high-value transfers; CHIPS, a private-sector netting system for large payments run by The Clearing House; ACH, the batch network used for payroll, bills, and business payments; RTP, The Clearing House's 24/7 instant payment network; and FedNow, the Federal Reserve's instant payment service launched in 2023.
What is the difference between Fedwire and CHIPS?: Both move large-value dollar payments between banks, but they settle differently. Fedwire settles each payment one by one, in full, in central bank money, and handled about $4.6 trillion a day in 2025. CHIPS nets payments against each other before settling: in 2025 it settled about $2 trillion a day using roughly $96 billion in funding. Fedwire is final the moment a payment settles; CHIPS achieves finality through its netting and prefunding design.
What is the difference between RTP and FedNow?: They do the same job through different operators. RTP, run by The Clearing House, has operated since 2017 and now carries a $10 million transaction limit. FedNow, run by the Federal Reserve, launched in July 2023, had signed up more than 1,500 financial institutions by the end of 2025, and has raised its network transaction limit to $10 million. Both settle individual payments in seconds, around the clock, with immediate finality. A bank can join either or both.
Why do US banks still use ACH if instant rails exist?: Cost and habit, in that order. ACH batches millions of payments and clears them at a tiny per-item cost, which suits payroll, subscriptions, and supplier runs where nobody needs the money in five seconds. The network moved 35.2 billion payments worth $93 trillion in 2025. Instant rails are growing quickly, but they are newer, and many corporate systems are built around ACH files and its predictable schedule.
Do any US payment rails work internationally?: Not directly. All five rails are domestic: they move dollars between US-regulated institutions. A cross-border payment uses them only for the domestic legs, for example Fedwire or CHIPS moving dollars between correspondent banks in New York while the international leg travels by SWIFT message. That seam between domestic rails and cross-border messaging is where most delay and cost in international payments accumulates.

Sources

Last reviewed 2026-07-16