Русско-англо-русский юридический словарь

commission fee – a fee paid to auctioneers, salespeople, etc, for their services" ⇒ ■ Sellers pay a fixed commission fee." (collinsdictionary.com)

Upon successful negotiation of a purchase and sale agreement, Sedo charges the buyer a commission fee of 15% of the gross purchase price* (minimum fee applies), in addition to the negotiated price owed to the seller. (sedo.com)