How can one conveniently check the balance of a NYC MetroCard online?

Currently, checking the balance of your NYC MetroCard online is not available. However, there are alternative methods to conveniently check your balance. Here are some options:

1. Subway Station Booth Reader: At a New York subway station booth reader, you can swipe your MetroCard to view your balance and expiration date on the screen [2].

2. MetroCard Machine: Insert your MetroCard into a MetroCard machine, click on the "Get Info" button, and access your balance [2].

3. Pay-Per-Ride Card: For a Pay-Per-Ride card, you can easily check the balance each time you swipe your card at the turnstile [2].

4. Bus Farebox Screen: If you use your MetroCard on the bus, you can check the farebox screen to see the remaining balance on your card [2].

It should be noted that the methods mentioned above require physical access to the MetroCard or the farebox screen. Regrettably, there is currently no online platform or website available for checking the balance of your NYC MetroCard.

For more information, you may refer to the following resources:

1. FaresLeft | MTA App Quest - Devpost
2. How to Check Your Metrocard Balance: 15 Steps (with Pictures)
3. MetroCard Balance Protection Program