The network-based data processing tool facilitates selection and engagement of a real estate broker and providers of ancillary services in a confidential and secure manner. The tool includes a database that automatically stores historical commission bid data and uses that bid data to assist a user in selecting and engaging a real estate agent. To maintain confidentiality agents are only provided with knowledge of potential Buyer and Seller interest if those parties have actively requested bids from those agents. In addition, actual bid amounts are not visible to other agents. The Tool includes an anti-spoofing feature that detects if when an agent attempts to masquerade as a buyer or seller to use the tool to investigate what fees other agents are bidding.