Example implementations relate to providing a web service. For example, an implementation includes a gateway to receive client certificate information from the client computing device and to determine a trust state of the client computing device based on the client certificate information. The gateway is also to receive a service request from the client computing device and to modify the service request. The implementation also includes a web service logic layer to receive the modified service request including the trust state and to determine a level of service associated with the client computing device based on the modified service request.