MESSAGING API
SMS API built for speed and scale
Send and receive text messages with our powerful SMS API designed for developers and no-code teams. With rapid set up, reliable delivery and security built in, businesses can send confidently with the Esendex SMS API.
Integrate our API with your existing systems to scale and automate your customer communication, ensuring the right text message is sent at the right time.
Everything you need from an SMS API
Lightning quick
SMS is one of the fastest ways to reach any mobile phone. Use our API for delivery in seconds and a setup process that sees your first message sent on the same day.
Reliable performance
Rest assured that time-sensitive text messages will be delivered securely and on-time, with industry leading performance and built-in compliance, including GDPR and ISO 27001.
Effortless integration
With our quickstart guides and 24/7 professional support, setting up and integrating into your existing systems is straightforward for developers and no-code teams alike.
> 5bn messages
Each year over five billion messages are delivered through our messaging API by businesses worldwide.
A reliable API
Scale your messaging without experiencing dips in performance for reliability during peak times.
Quick setup
Send your first live message quickly with our straightforward set up, integration and expert support.
Built by developers, for developers.
Integrate our APIs for simple, real-time communication
Use our API documentation to integrate across your services and systems in no time.
No commitment, 7 day free trial
Not a coder? We’ve got you covered
Our managed services team can help you set up and run your SMS API quickly. From initial configuration to testing and live deployment, we’ll make sure everything is in place so you can start sending messages with confidence.
“Our estate agent customers need to send appointment reminders and property transaction updates reliably and on time. With SMS from Esendex, texts land straight into the hands of the agent’s clients when they are most valuable to them.”
Riccardo Dawson – Chief Operating Officer, Software at Houseful
Let’s start sending, together.
Discover the full power of our mobile messaging platform.
Why choose Esendex?
Having us in your corner ensures that you can support your customers and your business – whatever comes your way.
20+ years of experience
Industry leading support
An expert and reliable partner
Security and compliance
Flexible and scalable options
Solutions designed for you
Get the most out of SMS with our powerful API
Notifications and alerts
Send instant updates on orders, deliveries, and service changes to keep customers informed.
SMPP gateway access
High throughput, low latency connectivity for seamless bulk SMS integration.
One-time password (OTP)
Verify users quickly with secure single-use SMS codes for logins and transactions.
Appointment reminders
Reduce missed appointments with clear and timely SMS reminders.
Scheduling & throttling
Send the right message at the right moment for maximum impact.
Two-way API
Customers can reply to your text messages for support, confirmations, and updates.
FAQs
![]()
How do I know if my message has been delivered?
How do I know if my message has been delivered?Our API provides real-time delivery receipts so you can track the status of every message you send.
![]()
Is the SMS API secure and GDPR compliant?
Yes. Our platform is fully compliant with GDPR and ISO 27001, with encryption in transit and at rest.
![]()
What kind of support is available during and after integration?
You’ll have access to support from our expert team, plus free setup assistance if you need it.
![]()
Can I send messages internationally using the API?
Yes. Our SMS API supports global delivery to over 190 countries with the same reliability and speed.
![]()
What programming languages are supported?
Our SMS API supports multiple languages including cURL, C#, PHP, Java, Ruby, Node and Go. Find out more in our developers’ section.
![]()
Do I need coding skills to use the API?
No. While developers can integrate directly, no-code teams can use our tools and guided setup.
![]()
Are there templates or pre-configured integrations available?
Yes. Our API works with platforms like Salesforce and Zapier, alongside pre-built message templates.
Let’s start sending, together.
Discover the full power of our mobile messaging platform.
