SMS API for developers and businesses
Send and receive SMS messages via our simple REST API. Connect your website, app or system to our SMS platform in minutes — no subscription, pay-as-you-go.
- REST API
- Official SDKs
- 99.99% uptime SLA
{ "to": "+44XXXXXXXXXX", "message": "Your code: 8472", "sender": "Smstools", "reference": "order-123" }
What is an SMS API?
An SMS API (Application Programming Interface) is an integration that allows your software to send and receive SMS messages directly via the mobile network. You make a simple HTTP POST to our API endpoint — no SIM card, no hardware, no subscription. Pure software. Our SMS API connects you to our SMS gateway that reaches 2000+ operators in 180+ countries.
What can you build with the SMS API?
OTP & Authentication
Send one-time passwords and 2FA codes directly to your users.
Transactional notifications
Order confirmations, shipping updates, appointment reminders automatically via SMS.
System alerts
Get an instant SMS when servers go down, errors occur or critical events fire.
CRM & marketing integrations
Connect your CRM, e-commerce or marketing platform to our SMS API.
Send SMS via API in 3 steps
Create an account
Register for free — no credit card required. You get instant access to the SMS platform.
REGISTER →Get your API key
Your API key is ready in the control panel. Copy and paste into your code.
Send your first SMS
Make a simple HTTP POST and your SMS is sent instantly.
View API documentation →Set up webhooks
Receive delivery reports and inbound messages (replies) in real-time on your server.
Webhooks →Everything you need
REST API
Simple HTTP/REST API with JSON. Well-documented with code examples.
Read more →Official SDKs
Ready-to-use libraries for PHP, Node.js, Python, Ruby and PowerShell.
Read more →Webhooks
Receive inbound SMS and delivery reports directly on your server via webhooks.
Read more →Delivery reports
Track every message status in real-time: sent, delivered or failed.
Two-way SMS
Send and receive SMS. Connect inbound messages to your application via webhooks.
Read more →Scalable & reliable
From 1 to millions of messages per day — 99.99% uptime SLA, redundant infrastructure.
Why use the Smstools SMS API?
The Smstools SMS API gives your application direct access to the mobile network. With a single HTTP POST you send SMS messages to any device worldwide — automatically, scalable and reliably. Pay-as-you-go, no SIM card, no subscription.
Connect your application and send messages automatically based on events, triggers or schedules.
Send one SMS or millions per day — the infrastructure scales automatically.
99.99% uptime SLA, redundant routes and 24/7 monitoring — your messages always arrive.
Your server sends SMS directly via the API. No SIM card, no GSM modem, no extra hardware.
Join over 10,000 happy customers
From 0,06 € per SMS in Belgium
- No hidden fees!
- Only pay for what you use.
- 20+ years experience
Your customer data stays secure in Europe
All our servers are located in Europe. GDPR-compliant, with Data Processing Agreement on request.
SMS API vs SMS software
Not everyone needs to code. Smstools offers two solutions: our REST SMS API for developers who want to integrate SMS into their software, and our user-friendly SMS software for communication and marketing teams. Both options deliver the same high deliverability.
SMS API use cases
The Smstools SMS API is used by developers, software builders and IT teams across many industries. The most common use cases:
- OTP & two-factor authentication — Protect accounts with one-time codes via SMS.
- Transactional notifications — Order confirmations, shipping updates, payment confirmations automatically via SMS.
- Appointment reminders — Reduce no-shows for medical practices, salons, garages and other service industries.
- System & server monitoring — Receive instant SMS alerts on technical failures or threshold breaches.
- CRM & marketing integrations — Connect Salesforce, HubSpot, Zapier, Make or your own platform to the SMS API.
Frequently asked questions
What is an SMS API?
An SMS API is a programmatic interface that allows your application to send and receive SMS messages via the mobile network. You make an HTTP POST to our API endpoint and your message is delivered. No SIM card, no extra hardware — pure software.
How do I integrate the SMS API into my software?
Create a free account, get your API key and make an HTTP POST to our REST API endpoint. With our official SDKs for PHP, Node.js, Python, Ruby and PowerShell you are connected in minutes. The documentation includes full code examples.
Which countries does the Smstools SMS API support?
The Smstools SMS API has direct connections with over 2000 operators in 180+ countries. You can send SMS to virtually any country in the world, including Belgium, Netherlands, Germany, France and the United Kingdom.
What does the SMS API cost?
Smstools works on a pay-as-you-go basis — you only pay for the messages you send. No fixed costs, no subscription, no setup fees. Create a free account and start testing immediately.