Buyer’s brokers are almost always paid by the listing broker in the form of an advertised cooperating commission. This commission is listed on the MLS listing when the listing broker enters into in the computer database. A broker can go into the broker portal and look up how much they will get paid on any property. Of course that information is not available to the general public.
The amount of the commission is determined by the seller and the listing broker, but is traditionally about half of what the seller agrees to pay their listing broker to sell their property. Without using a Buyer’s Broker, a buyer is not entitled to any of that cooperating commission and the entire amount is usually kept by the selling broker.