This is easy as I've been nerding out on privacy for more than a decade at this point, but privacy.com is the move here! It's a phenomenal service (even their free tier) which lets you make one time use cards, cards locked to a specific business, or just general use cards. You can set spending limits on all of their cards, and you can set these limits for a defined period of time. Privacy.com is the bee's knee's, truly don't know what I'd do without em these days!

Revolut has nice virtual cards, i use them all the time

the two I heard about are mysudo.com and privacy.com. I think both are US only. Are they both based in the US? It didnt say on the privacy.com about us page

edit: yes, they are both based in the US.

any non-US based options that offer services to the US?

Revolut has a single-use card feature. The (virtual) card regenerates with a new number after each purchase.

A bit more setup is required but I love having a Wise (formerly TransferWise) account for the virtual cards and the low fee currency conversion.

Looking for something similar for EU, the only one I know is Revolution but doesn't work for me

Revolut has disposable cards and only valid for one time paynent

theres privacy.com dk if its us only tho

Login to your credit card portal and check if they have it. I noticed mine has it as a free service now.

Edit: free service with my my cc account not straight up free to everyone with no cc.