A "middleman" is a person or company that acts as a go-between or intermediary in a business transaction. They facilitate communication and exchange between two parties and sometimes earn a profit by adding value to the process. Full definition
Brokers serve as middlemen as they find loans for clients from various lenders but do not finance the loan directly. (blog.compmort.com)
So, by saving on the cost of middleman between company and customer, insurers offer low rate of premium for online insurance policy. (comparepolicy.com)
Layers of middlemen in payments systems face a creeping threat across the nexus of commerce, stockbroking, currency trading or derivatives. (the-blockchain.com)