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Simple, Powerful,
Scalable SMS API

Integrate FastSMS features into your own software

using your preferred programming language.

Get instant access to everything you need to start integrating SMS
functionality into your software including 20 free credits for testing.

Our APIs are changing!

We’re upgrading our APIs and our platform; please visit our Developer Centre to learn more.
We support all languages (PHP, .NET, C#, Java, Python, Ruby etc) and new SDKs are being added to our documentation all the time.

SMS API Features

Access powerful fastsms features from within your own application using HTTP or SMTP

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Send SMS via API

Send text messages up to 918 characters long from your app via HTTP or SMTP

Inbound SMS via API

Get inbound messages direct into your app using automatic HTTP POST forwarding

Manage Users

Create sub-users on the fly with their own credits, contact information & settings

Manage Contacts

Keep your data clean by syncing your fastsms contacts with your own application

Custom Reports

Retrieve the data from reports for specific users to check usage, message content & more

Message Status

Check the status of a specific sent message to see if it was delivered


API Sandbox

Check your parameters and debug the code in your application
API loopback

Loopback Account

Test your code for free using a loopback account - just ask for one
SMS support

Expert Support

Get direct access to our in house developers for support on the API