What Qualifies as an Instant Payment?
Not every faster payment is an instant payment. In the U.S., instant payments are the product of two purpose-built rails: The Clearing House’s RTP® network, live since 2017, and the Federal Reserve’s FedNow® Service, which launched in July 2023. Both move funds between bank accounts in seconds, operate continuously, and settle with finality. You will also hear about push-to-card networks like Visa Direct and Mastercard Send in the same breath. These deliver near-instant payouts and have real value in disbursement use cases, but they are built on top of existing card rails rather than on direct account-to-account instant rails. Useful cousins, not the same animal.

24/7/365 Clearing and Settlement
The first thing that makes instant payments genuinely different is that they never close. ACH operates in batch windows and skips weekends and federal holidays. Wires are bound by bank business hours. RTP and FedNow, by contrast, clear and settle on Saturdays, Sundays, at 3 a.m. on Christmas morning, and every minute in between. For a small business cutting payroll, a marketplace paying out a seller, or a contractor getting paid the moment a job is finished, that always-on availability is not a marketing claim. It is a structural change in how money moves, and it erases the “why can’t I see that yet” friction that has plagued digital commerce for decades.

Push-Only by Design
Here is the detail that trips up most newcomers: both RTP and FedNow are push-only rails. Only the sender’s financial institution can initiate a transfer, and funds can only be credited into the receiver’s account. There is no pull equivalent. That means no ACH-style direct debit, and no card-style authorization where the merchant reaches into the customer’s account and retrieves funds. This design choice is intentional. It removes an entire class of unauthorized-debit risk, keeps the payer firmly in control of their own account, and sidesteps much of the credential-sharing surface area that has made card acceptance so heavy with compliance. For merchants accustomed to card rails, the mental model is unfamiliar at first, but it is cleaner.

Request for Payment: A Push Initiated by the Payee
If the rails are push-only, how does a biller actually collect? The answer is Request for Payment, or RfP. An RfP is a structured message that the payee sends through the rail to the payer’s bank, essentially saying, “here is the invoice, here is the amount, here is the reference data, please approve.” The payer sees the request inside their banking app or billing portal, reviews it, and approves it. Only after that approval does the payer’s bank push the funds back through the rail to the payee. Crucially, the payee never pulls. They ask, and the payer voluntarily pushes. This preserves the push-only integrity of the rail while enabling the use cases, like bill pay, collections, and account-to-account checkout, that would otherwise require a debit mechanism.

Irrevocability and the New Risk Posture
Once an instant payment settles, it is final. There are no chargebacks, no sixty-day return windows, and no “oh wait, let me reverse that.” Fraud and error resolution absolutely exist, but they almost always require cooperation from the receiver rather than a unilateral reversal like you would see in ACH or cards. The upside is significant. Receivers can rely on funds the moment they post, and the working capital that used to sit trapped in ACH float or subject to return no longer does. That combination of immediate availability and finality cuts meaningfully into both liquidity risk and the receiver-side counterparty exposure that has long suppressed B2B faster-settlement behavior. The tradeoff is that the risk burden shifts upstream, onto pre-transaction verification. Strong customer authentication, payer confirmation, payee account validation, and real-time screening are no longer optional nice-to-haves. They are the front line. For the channel, that is a meaningful shift in how we should think about fraud tooling and integration design.

Why This Matters for the Channel
Instant payments are not simply a faster version of ACH or a cheaper version of cards. They are a structurally different kind of rail, with their own economics, risk profile, and integration patterns. For ISVs and VARs serving retail, hospitality, healthcare, field services, and beyond, the opportunity is to move early and thoughtfully, building for a world where settlement is measured in seconds, reconciliation arrives with the payment, and the customer approves the transaction from inside their own banking app. Consumer choice matters here too. Approving a payment from within a familiar banking app, with no card numbers or merchant logins to hand over, delivers a cleaner and more transparent experience than most checkout flows ever have. Combined with lower cost of acceptance, richer remittance data that travels alongside the payment, and network reach growing quickly across both RTP and FedNow, the early movers in the channel will be the ones shaping what modern payments look like for everyone else.