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Practical notes on amounts, crypto payments, networks and keeping your card safe.

A receipt with a balance, two fee lines and a highlighted total

Worked examples: what different balances cost in total

A payment page with a coin selector and a countdown timer

Paying in crypto • 5 min

Using the crypto checkout: what the payment page shows

Three fuel gauges labelled gas, energy and bandwidth beside a USDT coin

Networks & TXIDs • 5 min

Gas, energy and bandwidth: how each chain prices a USDT send

A payment amount shrinking slightly as it passes through a fee gate

Slip-ups • 5 min

Sending less than the total: fees that get deducted on the way

A balance meter with a section greyed out as reserved

Your balance • 5 min

Why a balance can look lower than expected (holds)

A boarding pass and a dark virtual card on a glowing runway line

At the checkout • 6 min

Flights and virtual cards: holds, names and billing details

A masked card number unblurring for a moment behind a countdown ring

Safety • 5 min

Unlocking card details safely: the one-minute window

A phone showing a big keypad, a pay sheet and a confirm sheet stacked on top of each other

Using the app • 6 min

Your first top-up: a tour of the keypad and the three sheets