contract is a legal instrument that defines the rights and responsibilities of
Yevgen Timashov / iStock / Thinkstock. A contract for services is a contract by which a provider of services agrees to provide a service to a client in exchange for a payment. Here's an overview of the rights and responsibilities of a client who hires a provider of services. Important! Other rules apply if the provider of services is considered to be an itinerant (door-to-door) merchant.