Crypto debit cards fees: flat fee or %?

Overview

I’m looking at crypto-funded virtual debit cards for some travel stuff next month, mostly small online payments and maybe tap-to-pay if it works. The big thing I’m trying to compare is whether a flat per-transaction fee is actually better than percentage fee, especially when the card costs something upfront and onboarding is supposed to be like under a few minutes. Anyone here used these no-id /no bank login type cards recently and know what fees or delays actually show up in real life? su

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