GatewayAPI | 349 followers on LinkedIn. Global CPaaS and SMS gateway with first-rate SMS services. Owned and operated by ONLINECITY.IO | GatewayAPI is a global CPaaS and SMS gateway with tens of thousands of satisfied customers worldwide who use GatewayAPI as their preferred service to send A2P SMS messages. We have on numerous occasions won the Børsen Gazelle Award, which is awarded to fast-growing companies. Furthermore, we are repeatedly awarded with a Triple-A Credit Rating from Bisnode.