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If you're looking for cheap transactions, Degiro (EU based) or InteractiveBrokers (US based) are probably the best options.

With Degiro you can get 20€ of free commission when you sign up with a referral

Degiro has free commission on a bunch of popular ETFs as well.

Revolut started to allow trading 1 month ago, but only for Metal cards customers so far. Hope others (Monese, Monzo) will follow.

I actually work on one that is trying to do it, www.getbux.com

Netherlands and Germany for now.

Interactive Investor in the UK

Freetrade in the UK does this.