I think the rule is that if a savings account can be used to send money directly to more than one external account (i.e. more than a single linked current account) it’s classed as a payment account for open banking purposes, and therefore within the scope of open banking. Or something like that. Which is why major banks do make some savings accounts available but not others.
Monzo only make pot balances available, and not the pot transaction feed. Do Starling make goal transactions available?
See, Revolut didn’t include Starling spaces to their open banking, but did include all my Monzo pots which I’d have preferred the other way around, as I couldn’t opt out of seeing them either by open banking.
I’m not too sure, spaces and pots are handled differently between Starling and Monzo respectively.
Spaces take payments from spaces and will decline if not enough available, pots move money to your main account for the payment to be made, and take from your main balance if not enough in the pot.