Is the API an extra charge to use? Mozeo Support Updated July 27, 2015 21:15 Follow No! The API is included with every account. You simply pay for your text messages as you would normally. Related articles What is the Text Messaging API? How do I setup the Text Messaging API? Does your API have error coding? If I sent a group text message and they reply, will everyone get it? How do I setup a new Text-to-Screen? Comments 0 comments Please sign in to leave a comment.