An Asset Purchase Agreement is a legally binding contract between a buyer and a seller that details the terms and conditions of the sale of a business's assets. Secure your San Antonio small business's transactions today!Our asset purchase agreements from Dan Burke are created to account for all of your assets. Need legal help with a merger or acquisition of another business? Contact a San Antonio business merger and acquisitions lawyer at our firm. Units must be paid for on the day of the sale. Filed with the Securities and Exchange Commission. An asset purchase agreement (or APA) is a binding document between a buyer and seller for the purchase and sale of a company's assets. 2.1 Cash Deposit at Execution of Agreement. It may be easier to buy the cash in the cash registers rather than collecting all the cash and then restocking the registers with the buyer's cash.