Kay hands over his coins to the thief who makes them disappear somewhere into his clothes.
"Okay, then Guv'na, ya wanna be knowing about the high-ups then I 'spect with this little gift, you'd be most interested in Ace, the head of the thieves guild, and his two subordinates The King and Queen, King is the best fence you'll find if you're looking for something of that persuasion or to remove something from your possession, he's fairly expensive though but he's the best there is, the Queen is a catburglar, she's even stolen a thing or two from the proper royals or so the tales go. Or if you're looking into who holds the most sway in the underworld, go to the King's Head tavern, and tell the barkeeper you'd like a Iron Garrote, he'll get you in contact, with those who make bothersome people vanish.
Or you might be looking for wealth marks I suppose, the Head Merchant Garil Winterbrook and the Duke Givan, Duke of the Great Forest both claim to be the second-richest man in the kingdom and no one seems to be able to confirm which as the right of it, Winterbrook lives in the merchants district in a house very close to the palace, his grace, is similarly located in the nobles quarter at least as far as his residence when he's in court goes. "