Network Programming in .NET

There are a million different APIs that allow you to send SMS messages, but here is a really simple one, that although is limited to the US or Canada, is really cost effective, at 1 US cent per SMS, with no monthly or setup charges.

There is also a free plan that starts at 5 SMS per day, at no cost.

It’s really easy to use, you subscribe to the API here: https://rapidapi.com/dananos/api/1-cent-sms/pricing

to get your API Key, which you include as a HTTP header called “X-RapidAPI-Key”, then you post a body such as the following

{
    "text" : "Your Authentication code is 74456",
    "phone" : "+17047037094"
}

To the URL – https://1-cent-sms.p.rapidapi.com/default/SMSLambda

(Yes, it’s a AWS lambda function on the back-end)