Crypto prices move, so checkout works in two stages.

## Before you continue: an estimate

The amount under **Estimated total in** is a guide. It refreshes every 15 seconds, and **Refresh price** updates it now. It can change between refreshes.

## After you continue: a locked price

When you choose **Continue with** your asset, the exact amount is locked for a few minutes. **Time left** counts down on the payment page. Send the exact amount shown before it reaches zero.

## If the timer runs out

The page shows **Payment expired**. Nothing is taken from you. Start a new payment from the merchant's link and you will get a fresh price.

If you already sent money just before it ended, keep the page open and wait. If it still shows **Payment expired** or **Payment failed**, see the article on a failed payment.

## If the price cannot be locked

You may see **Unable to lock the price**, **This payment method cannot be priced right now**, or **We couldn't calculate this price**. Check your connection and refresh the page, or pick another asset or network.