A system may receive a network address to be validated to determine whether the network address is associated with a toll-free data service. The system may perform a validation operation to validate that the network address is associated with the toll-free data service. The validation operation may be based on a key identifier associated with the network address or a network address signature associated with the network address. The key identifier may correspond to a security key used to create the network address signature. The network address signature may be created using the security key. The system may determine whether to bill a first party or a second party for data usage associated with the toll-free data service based on the validation operation. The system may provide information that identifies whether to bill the first party or the second party for the data usage associated with the toll-free data service.