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The last time I checked their website, I believe they had a 0.50 EUR fee or something for a failed transaction? that's a bit ridiculous in my opinion especially when it comes to these crypto debit cards, since it's not uncommon that they get rejected when used with certain services online... Have often do you use it online?
You are almost right. They have declined the fee, but it's 0.50 USD, not EUR, for a failed transaction. For a month they have 3 decline waiver facilities for failed transactions. After 3 declines, they will charge 0.5 USD per failed transaction. The reasons vary, depending on circumstances, either not enough balance or some other issues. But so far I can see almost everywhere Redotpay is accepted. I have tried to send SWIFT through Redotpay from Remitly, but it seems they don't allow SWIFT transactions. Otherwise I don't face any issues yet for any payment.
You can check their fees here:
https://helpcenter.redotpay.com/en/articles/10339271-redotpay-card-limitations-feesI have been using it regularly for buying tickets or hotel bookings when I am abroad. Due to limitations, I don't use my credit cards much. I have a physical card from Redotpay that can be used anywhere, including for shopping and cash withdrawal from the ATM. I feel it's normal about decline fees since they are giving you 3 chances for free.