A cloud communications platform offering programmable APIs for SMS, voice, and more. Twilio is “a cloud communications company… [providing] programmable communication tools for … text messages … using its web service APIs”. Traders use Twilio’s API to send SMS or WhatsApp alerts. For example, an EA could use Twilio’s REST API to send an SMS alert “EUR/USD hit target” to a trader’s phone. Twilio abstracts the telephony layer, making it easier for robots to send text messages globally.