REST SMS API

Integrate SMS into your new or existing app with this Bulk SMS API

Get started with a few lines of code

Add bulk SMS functionality into your application. Try one of the code snippets below, or view our SMS API Documentation for more HTTP callbacks.

Send SMS

Get SMS Responses

Get SMS Stats

Format Number

Lease Number

Optout List Number

Add List

Remove List

Send SMS

curl https://api.transmitsms.com/send-sms.json \
  -u [API Key]:[API Secret] \
  -d message='[Insert Message]' \
  -d to=[Phone Number 1],[Phone Number 2],[Phone Number 3]

View Docs

Try it Free

Client Libraries

Send, receive, and retrieve SMS data from our fully documented libraries for .NET, C#, PHP, Ruby, and GO.

It takes just a few minutes to get started with our SMS Gateway API. Retrieve your free API key, copy a few lines of code, and start sending and receiving text messages within your new or existing applications.

Activate Free API Key

SMS API Features

Accessing your API Key and Secret

Test our services by signing up for a free account to access your API key, and to create an API secret.

Choose your GET or POST callbacks

Add SMS functionality into your service through our well documented parameters.

Send SMS, receive replies, and retrieve data

Deliver text messages through the HTTP callbacks of your choice. Reply to responses, and get campaign reports.

Over 3,000 Integrations Available

Integrate this leading SMS solution with your existing software for improved user communication. Pairing with platforms such as Shopify, Facebook, Salesforce and more is easy to set up and even easier to use.

Zapier Integrations

Direct Integrations

Why Burst SMS

100% SMS Delivery to Carrier Guarantee

All messages are sent through ON-NET connections to local carriers. No grey routing.

Virtual Mobile Numbers

Get access to high-quality bulk SMS numbers to maintain brand consistency and recognition.

24/7 x 365 Support

Get world-class support around the clock. Our team of messaging experts are here to help.

Feature-rich

From our flexible SMS API and integrations to email to SMS and Quick SMS, see why 30,000+ businesses choose burst for SMS advertising.

No Contracts

Our bulk SMS service is prepaid. No need to worry about monthly contracts or commitments.

Ease of Use

All our SMS solutions are designed to be easy to use. Choose from an intuitive web interface, REST SMS API, or an extensive selection of integrations to connect with your pre-existing tech stack.

Start Free Trial