A dip or spike in TRX's price overnight doesn't really affect a single Stars purchase — checkout quotes the live rate the moment the order is placed, not the rate from earlier.
A card payment never requires checking a price tracker; someone curious about TRX's deeper trends can look one up, though it's not required to complete an order.
Dedicated crypto price trackers show far more historical and real-time detail on TRX than this page — worth a look for anyone wanting the full picture.
No — the rate is locked in the moment the TRON transaction is sent, regardless of what TRX's price does afterward.
Not really — the live rate at checkout already reflects the current price, so there's little to gain by waiting.