SMStrade provides services for sending and receiving SMS messages internationally. They offer SMS gateway services, providing bulk SMS capability, HTTP and email integration for SMS reception, and a web payment system that is available in 60 countries.
The majority of the SMStrade API is available over HTTP, though limited SOAP services are available, and all API methods are available over SSL. The API provides functionality for sending and receiving messages, account management, reporting, and bulk and time-delayed messages. There is also documented support for sending messages with international characters.
Please note that, while the majority of the site and documentation is available in English through their .eu portal, some content is only available in German on their .de site.