US Rails: FedNow vs RTP by The Clearing House

For years the United States lagged behind other countries on instant payments. That changed with two rails that now move money in seconds, around the clock: RTP, launched by The Clearing House in 2017, and FedNow, launched by the Federal Reserve in July 2023. They do similar things but come from very different institutions and differ in meaningful ways. If you are building payments in the US, you will likely reach both. This post compares them.

Two operators, one goal

Both rails deliver instant credit-push payments: the payer's bank sends funds that land in the receiver's account within seconds, and the payment is final and irrevocable. Both operate 24 hours a day, 7 days a week, including weekends and holidays. Both settle in central-bank money. The fundamental difference is who runs them.

• RTP is operated by The Clearing House, a private consortium owned by large US banks. It launched in November 2017 and was the first new US payment rail in decades.
• FedNow is operated by the Federal Reserve itself, giving it the reach of the central bank and access for the many small and midsize institutions that already hold Fed accounts.

The existence of two operators is deliberate policy. A central-bank rail alongside a private one provides resilience, competition, and broad reach — particularly to smaller banks and credit unions that value the Fed relationship.

Messaging and standards

Both rails use ISO 20022 messaging, which is a big improvement over legacy US formats and eases interoperability in principle. A credit transfer, a request for payment, and status and return messages all follow the ISO 20022 model. That said, the two rails are separate networks with their own scheme rules, participant onboarding, and technical connections — a bank must join each one individually, and a payment on RTP does not automatically traverse FedNow or vice versa. There is no universal interoperability between them today.

Transaction limits

Both rails set a maximum transaction value, and both have raised limits over time as confidence grew. RTP has increased its limit substantially since launch, and FedNow launched with a default limit that participating banks can adjust up to a scheme maximum. The practical point for builders: limits differ between the two rails and change over time, and an individual bank may set its own lower limits within the scheme ceiling. Never hard-code a single limit; treat it as configurable per rail and per institution, and check current scheme values.

Settlement model

The rails differ in how interbank settlement works:

• RTP uses a prefunded joint account at the Federal Reserve. Participants fund a shared balance, and payments settle against it in real time, so settlement is effectively instant and the prefunded balance removes interbank credit risk.
• FedNow settles directly across participants' master accounts at the Federal Reserve, moving funds between reserve balances instantly for each payment.

Both approaches achieve real-time finality; they simply use different mechanics reflecting their operators.

Features and roadmap

Both rails support more than plain credit transfers. Request for Payment (RfP) is a key overlay-style capability on both, letting a biller send a structured request that the payer approves, with the money still moving as a credit push. Both also carry rich remittance data thanks to ISO 20022. The Fed and The Clearing House continue to add capabilities over time, so the feature gap between them narrows and shifts. Fraud tooling, higher limits, and additional message types are common areas of ongoing development.

Which one do you use?

For a business reaching consumers and other businesses, the answer is often both, because reach depends on which rail the counterparty's bank has joined. A receiver can only be paid instantly on a rail their bank participates in. Aggregators and banking partners increasingly abstract this by routing a payment over whichever rail can reach the destination, choosing based on the receiving institution's participation and the rails' current limits. The design lesson mirrors the rest of payments: model the rail as a pluggable route, not a hard-coded assumption.

Key takeaways

• The US has two instant rails: RTP from The Clearing House (2017) and FedNow from the Federal Reserve (2023).
• Both offer 24/7 instant, final credit-push payments settled in central-bank money and use ISO 20022 messaging.
• They are separate networks with their own rules and onboarding, and there is no automatic interoperability between them.
• Limits differ per rail and per bank and change over time; RTP prefunds a joint Fed account while FedNow settles across master accounts.
• Reaching all recipients often means supporting both rails and routing by the receiving bank's participation.