A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers. A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale.To securely and accurately complete the One Time Showing Agreement and ensure all legal bases are covered, click the button below. A listing agreement is a contract between homeowners and brokers that legally establishes how a realtor will find a property buyer on the seller's behalf. The buyers representation agreement would let the agent show you listings in which the seller covers the commission, but only if you approve. A Commission Agreement for Sale is used for one-time showings of real estate so a Realtor can show a home to a prospective buyer and be paid a commission. Your contracts are just fill in the blank forms. How to fill out a basic Listing Agreement.