Why RTP matters
RTP was the first US instant-payment rail at scale. Owned and operated by The Clearing House (a consortium of large US banks), it lets participating institutions send and receive final, irrevocable payments around the clock. Before RTP, "instant" in the US really meant "we'll fund it from your line of credit until the ACH clears."
FedNow launched in 2023 as a public-sector counterpart, and most modern fintech programs design for both rails interchangeably.
When to use it
RTP is great for the same use cases as FedNow: gig payouts, marketplace settlement, B2B same-day invoice payments, and customer-initiated transfers where speed matters. The choice between RTP and FedNow is usually driven by which one your sponsor bank supports and how their pricing breaks down — not by capability.
Common pitfalls
- Receive-only banks. Many smaller banks are RTP-receive-enabled but not send-enabled. Test the corner case.
- Per-transaction caps. RTP has dollar limits per transaction that have grown but still gate some treasury use cases.
- Confusing RTP with same-day ACH. Same-day ACH is faster than standard ACH but still reversible and batch-cleared. RTP is final, individual, and 24/7.
RTP and FedNow together turn US instant payments from a luxury into a baseline expectation.