Open-Loop Transit: Why You Can Tap Your Bank Card (or Phone) on the Subway Now
Transit gates now accept the same contactless bank cards and phone wallets you use in shops. Here is how open-loop NFC payment works and why the fare settles after you tap.
Transit gates take your bank card because they speak the same contactless EMV language as a shop terminal. That is what open-loop NFC transit payment means: the system accepts general-purpose cards and phone wallets, not just a transit-only card. Here's how the tap works, why the fare settles after you walk through, and where you can see it.
Open loop vs closed loop
Open-loop systems accept the same bank-issued cards and digital wallets that run on global payment networks. A closed-loop system works only with its own card or pass.
New York's OMNY shows both side by side. According to Wikipedia's OMNY entry, it accepts contactless bank cards and mobile payments as well as physical OMNY cards. The OMNY card is the closed-loop option for riders who lack a bank card or wallet, or would rather not use one.
What happens when you tap
The radio part
Contactless cards use NFC that complies with ISO/IEC 14443 on 13.56 MHz. The optimum distance is typically 4 centimetres or less, so press the card or phone to the reader. Don't wave it. If taps miss on your phone, check where the NFC antenna sits on your phone. For the standard itself, see our explainer on ISO 14443.
The payment part
The card's chip talks to the reader following the EMVCo standard. The same source says contactless transactions run on the same network as chip-and-PIN cards and get the same fraud protections.
A phone does not hand over your real card number. Wallets such as Apple Pay use tokenization: the card issuer generates a token, and a Device Account Number, similar to a card number, is created during setup with an associated private key that authorizes payments.
Why the gate doesn't wait for your bank
A fare gate has less than 300 milliseconds to respond to a tap. That's too short to ask the bank for approval in real time. So transit uses deferred authorization.
In practice:
- The tap is authenticated offline and checked against a deny list.
- The transaction later goes through the merchant's back office to the issuer, which evaluates funds, account status and fraud risk.
- If the issuer flags the card, the operator can add it to the deny list and block further taps after the first denial.
- The operator can try to recover unpaid fares, and network-supported risk-sharing can cover limited losses.
The same article argues this gives agencies better tools to detect fraud than legacy systems, though it does not eliminate fraud risk.
Where you'll see it
OMNY is the clearest example. Per Wikipedia:
| Milestone | Date |
|---|---|
| Public launch (Staten Island buses and 16 subway stations) | May 31, 2019 |
| Subway and MTA bus rollout completed | December 31, 2020 |
| Fare capping introduced | February 28, 2022 |
| MetroCard sales and distribution ended | December 31, 2025 |
By August 2023 the MTA said OMNY had passed more than 1bn taps, nearly half of all subway journeys. Check your own agency's site for which cards and wallets it accepts.
Tips and gotchas
- Use the same card or phone to tap in and out. The system links taps by the card or token it sees, so switching devices mid-trip can leave a journey incomplete.
- If your iPhone taps start failing, read about taps that fail on iPhone.
- Wondering whether you need a shield? See RFID-blocking wallets.
NFCore is for NFC tags you own, such as NDEF stickers and business cards. It isn't a way to pay fares, and we don't cover copying cards you don't control. To explore tags of your own, get NFCore on the App Store or Google Play.
The short version
Open-loop transit turns a bank card or phone wallet into a ticket. The tap uses the same NFC and EMV stack as a shop payment, and the fare is settled behind the scenes after you pass the gate.
Frequently Asked Questions
Is open-loop the same as Apple Pay or Google Pay?
No. Open loop describes the transit system, which accepts ordinary bank cards. A phone wallet is one way to present a card, and it sends a token instead of your real card number.
Why do I need to use the same card or phone at entry and exit?
The system links your taps by the card or token it sees. Using a different one can leave a journey incomplete and can affect fare rules like capping.
Do I need to open an app to tap on a phone?
Usually not for a phone wallet: hold the phone near the reader. Behavior varies by phone and transit agency, so check your agency's guidance.
What is the closed-loop alternative?
A transit-only card, like OMNY's own reloadable card, for riders without a bank card or phone wallet.