Send and receive mass text messages globally to customers with our programmable SMS API service.

Trusted SMS API Provider

Esendex’s API for Bulk SMS is Trusted by Some of The Biggest Brands in The World!

Powerful SMS Gateway Features

When you combine our SMS API gateway with these awesome features, anything is possible! Our SMS API delivers the tools you need to boost company sales, revenue, customer engagement, and stay connected with your customers.

Short Code Texting Service

Send mass text messages to customers fast from a memorable 5-6 digit phone number.


Send cool pictures, emojis, GIFs, links to your website, and even audio messages.

Long Code Texting Service

Send text messages from a local phone number that your recipients will know and trust.

10DLC Capable

Get a new SMS long code solution for all of your U.S. A2P text messaging use cases.

SMS 2 Way

Engage customers by sending & receiving bulk SMS & create powerful conversations.

SMS Appointment Reminders

Reduce missed appointments by sending automated SMS reminders to your customers.

Schedule SMS

Schedule texting campaigns to be sent out at optimal times for higher conversions.

Two-Factor Authentication

Send text messages to users of your application, website, or software to ensure secure logins.


Automate your entire SMS campaign and the response customers receive after replying.

Opt Out Handling

Recipients can easily remove themselves from your SMS campaign with a click of a button.

Number Pooling

Use multiple phone numbers to deliver even more text messages to your entire contact list.

Detailed Reports

Get detailed reports on how many text messages are sent, plus more valuable data.

Why Choose Esendex’s SMS API?

We strive to be the best SMS service provider in the industry.
Our trusted text SMS API provides quality performance to drive your communication strategy.

1. World Class Support

Most SMS API services don’t have active online support channels customers can speak to when they need it the most, and we understand. That’s why we have 24/7, around the clock emergency support for our text API service.

  • Fast Response Times
  • Fast Troubleshooting
  • Chat, Email, & Phone Support

2. Global Texting SMS API

Our SMS texting API enables you to leverage your business communication globally without any interruptions. Don’t worry about distance! Get connectivity in more than 190 countries.

  • Tier 1 SMS Network
  • 99.9% Guaranteed Uptime

3. Government Level Security

Our SMS API is 256 Bit Encrypted (typically only reserved for governments and militaries), SOC2 Type 2 Certified, HITRUST Certified. Hardware-based SMS servers are strategically located throughout the US-owned and operated by Esendex.

  • 256 Bit Encrypted
  • HITRUST Certified
  • SOC2 Certified

What is an SMS API ?

An SMS API is an acronym for a short message service application programming interface. The SMS message API allows your business to use SMS messaging within your software platforms, website, or CRM easily and quickly. You can program our SMS service API to do almost anything you can imagine through text!

When Should You Use an SMS API?

There are many reasons why you might want to use an SMS API for your business.

If you need to send SMS messages to customers or employees, an SMS API can be a great way to do it. With an SMS API, you can send text messages programmatically, meaning you can automate the process and make it much easier and faster.

Another reason to use an SMS API is for marketing purposes. With an SMS API, you can send mass text messages to potential customers or existing ones. This can be a great way to promote your business, especially if you offer discounts or coupons in your texts.

You can also use an SMS API to send appointment reminders, shipping notifications, or any other information that you need to get to your customers quickly and easily. Basically, if you need to send text messages as part of your business, an SMS API is a great way to do it. It’s fast, efficient, and can save you time.

Simple SMS API Documentation

We know that implementing an SMS bulk API into your business takes time. That’s why we made our documentation easy to understand and implement into all of your projects!

You’ll have no problem connecting with the SMS API gateway using any programming language capable of REST or SOAP calls, as it was created by developers who wanted nothing more than making sure you could get up and running quickly without having trouble understanding what is happening or how things work underneath the hood.

Build Your Apps Faster

  • Uncomplicated API References
  • Code in Multiple Programming Languages
  • Technical Customer Support
  • Helpful FAQ Section for Dev

The Esendex Difference

Since the early 2000s, Esendex has been one of the industry’s most trusted SMS API providers. The truth is we do things differently.

Our vision is to shape your connections to the world through reliable, usable, and adaptable Communication and Data APIs.

24/7 Support – Lowest Pricing Multiple – Service Channels

What Our Customers Have to Say

We’ve been rated 5 out 5 stars on Capterra, GetApp, Google and Facebook – based on 40+ reviews.
We’re a Twilio competitor you can trust to provide you with the best services.

With our easy-to use SMS service API, you can programmatically add SMS campaigns or set up autoresponders with just a few lines of code.

Marketing & Promotion

Send discounts & offers that advertise your products and services to push subscribers to become customers.

Want to give the love of your life a special Valentine’s Day gift? For 24 hours, our VIP text subscribers can get 15% off all flowers. Your significant other awaits you:

Learn what your customers think about your products, services, and company as a whole to resolve their issues and improve business.

Hi Jerome, you recently bought your new cellphone, can you tell us how often you’re using it? Your feedback is very important to us. Cheers, ABC Mobile.

Text-to-win Competitions

Entice your customers with opportunities to win prizes and discounts on your products and services.

Thanks for entering for a chance to win a FREE 60 minute massage!

Emergency Notifications

Easily send time-sensitive alerts to your customers to let them know about important events like fraud, weather alerts, company updates and so much more.

Please take shelter. Lock your doors and windows. A category 3 hurricane is headed towards your location in Chesapeake, VA around 1:00pm EST. Await further info. Check for more info.

Appointment Reminders

Put an end to no-shows by sending scheduled text messages to be sent before both parties meet.

Hi Matthew. Your dental appointment at 123 Teeth is on 2/18/2022 at 3:00pm. Reply C to confirm or stop to end all text messages.

Get all of your text message API questions answered here.

What is an SMS API?

Short Message Service (SMS) continues to be the most used text message service across both wireless and traditional telecom infrastructure. An SMS application programming interface (API) enables web applications to easily send and receive text messages.

How does an SMS API work?

Like other application programming interfaces, an SMS API allows a computer program to share the code and function like a text message service.

What is an SMS API used for?

Ease of use and reliability make text messaging APIs the ideal choice for managing important communication. An SMS API is used for security, critical communication, and customer care.

How do I integrate an SMS API?

A software developer or programmer manages the SMS API integration. It usually takes less than a day to write the code that communicates with the text messaging API.

What are the benefits of using SMS API?

Using a text message service API allows you to add text messaging capabilities to your current application or software. A few lines of code replace expensive telecom infrastructure.

How do you test an SMS API?

To test your SMS service, simply use your test credentials like you use your live credentials. This enables you to test your text messaging API without actually sending a text message. In addition, your account will not be charged.

How to create an SMS API?

There is no need to create one! We’ve already built it for you. You can create your account here to get started integrating our programmable SMS API into your application, website, or CRM.

How can i get an SMS API?

You can gain access to Esendex’s programmable SMS API by creating an account here.

What is SMS API integration?

SMS API integration is when you connect a website, CRM, or application to an SMS API—ultimately giving your software or app the ability to send customized text messages.

How to integrate Esendex’s SMS API in PHP?

You can integrate our programmable SMS API by following these directions.

What is an SMS API gateway?

An SMS gateway API enables a computer or software to send and receive SMS and MMS text messages to and from SMS and MMS-capable devices.

What languages can I integrate the Esendex SMS API with?

Esendex’s programmable text messaging API can integrate into any application, website, CRM, or software using C#, VB.NET, VBScript, PHP, PHP with cURL, Ruby, Java, and any language capable of making REST or SOAP calls. Check out our Docs.

Do you provide SDKs?

No. Esendex does not offer SDKs.

Do you offer a free SMS API?

Esendex does not offer free SMS APIs. However, we do offer testing credits to customers who’d like to tryout our messaging API under specific parameters. To learn more about these parameters, please contact our helpful sales team.

Do you pay for every message you send over SMS?

Yes. Every message sent and received to your short code or long code phone number will be charged to your account. Click here to learn more about our pricing.

Do you have an out-of-the-box SMS solution?

Yes! Esendex has an out-of-the-box SMS broadcasting software called “Dash Notify”. It’s an easy-to-use SMS software that enables you to send text messages, no programming required.

Can I send images, videos, or other rich media with your SMS API?

Yes. Esendex’s SMSAPI also runs on our MMS API. So, sending rich media is 100% possible. Click here to learn more about our MMS API services.

Do you provide a REST API?

Yes. Esendex’s bulk SMS API is able to send text messages using both REST and SOAP calls.

Do you have limits on messages sent via API?

No. Esendex’s API to send SMS has no limits. At 600 text messages per second, we can reach as many of your contacts as fast as you need without any issues.

What SMS API functions are available?

Our API SMS has incredible features from scheduling texts to be sent at optimal times, to two-way texting and so much more.

How do I request to use Esendex’s SMS API?

You can request to use Esendex’s SMS notification service by contacting our sales team and booking a meeting. From there, our sales team will make sure your use case is valid and answer any questions before activating your account.

How long does it take to receive SMS API approval?

Once you submit your information to our helpful sales team and they qualify you as a good candidate, you can have approval to use our SMS text message API in less than an hour. It’s that fast!

How much does Esendex’s SMS API Cost?

Please visit our SMS API pricing page to learn more about our pricing.

Products for a range of use cases


Texting API designed to send & receive SMS & MMS globally using a short code or 10DLC number.

SMS Software

Easy to use SMS software that can send & receive SMS & MMS using a short code or 10DLC number.

Voice Broadcast

Powerful voice API that sends mass automated phone calls quickly to mobile & landline devices.

Phone Verification

Verify mobile & landline numbers, find service providers, & define time zones to restrict calling.

Let’s start sending, together.