Twilio is announcing the Passthrough API, which simplifies the way developers can send bulk SMS notifications with a single API request. This allows businesses to make marketing announcements, send emergency response notifications, and even disaster alerts to their customers across multiple channels such as SMS, iOS and Android push notifications, web push via FCM and APNS, and Facebook Messenger. With Passthrough API, developers can simplify their application by making one API request to send up to 10,000 SMS messages, and use it for multichannel campaigns. The API is available in beta and uses the `toBinding` parameter to specify the destination address and channel type, allowing users to send notifications without storing addresses and with a maximum request size of 1MB.