A contract formation, management, and payment platform includes a method for negotiation and implementing smart contracts for the purchase and payment of goods and services. Parties can negotiate through a template and automatic negotiation or through features that compare competing contracts and positions to find agreeable positions and create best fit negotiated agreements using natural language processing, machine translation, and a library of legal content. Incoming proposed contracts or comments are serialized and then compared to each other and to a clause library, and agreeable negotiated positions are determined. Once all agreeable negotiated clauses are determined, then they are assembled into a new best fit negotiated agreement that parties can be prompted to review, accept, reject, or set aside the new agreement for manual review. Platform providers can license modules, charge users a fee for each transaction, and receive commissions for products and services sold within the platform.