Print to Post API

Send letters and marketing postcards programmatically with the ClickSend Post API. Our API makes sending letters online effortless!

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Automate Your Letter or Postcard Sending with the ClickSend Post API

ClickSend offers a powerful and flexible set of APIs that enable you to add the bulk letter and postcard printing capabilities to your existing applications. Boost productivity by automating letter sending through your current platforms and applications.

Get Started with the ClickSend Post Gateway API

Download our sample post API code to confirm it is compatible with your system. Our post API can integrate into your existing code and make communicating with your customers easy.

Check out these resources to help you start sending automated letters.

Why Choose ClickSend's Print to Post API

Our REST API offers an intelligent solution to sending thousands of letters or postcards through the post. We have a range of downloadable sample codes so you can be assured of compatibility, and 24/7 customer support to ensure your integration goes smoothly.

No Upfront Contracts or Fees

With no setup cost or monthly fees, our pay-as-you-use option comes with highly competitive rates, proving to be a far better alternative to the Post Office!

Free 24/7 Support

Talk to us through live chat, phone, contact form or email. There’s always a human on the other end, ready to help.

We'll Beat Comparable Quotes

Seen a better offer? Bring it to us so we can make a deal.

Intuitive API Integration

Sign up and get access to our free API key. Our APIs come with comprehensive documentation to make integration a breeze.

Global Coverage

Send mail anywhere in the world, at a click of a button. And at the best rates in the world!

100% Uptime SLA Guarantee

We’re so confident in our reliability, we offer a 100% uptime SLA guarantee so you can be sure your message reaches when you need it to.

What is a Print to Post API?

A print to post API, or postal mail API, is a defined set of instructions which enable systems to send letters or postcards in the mail via an online post gateway. A Mail API is used to add native snail mail capability to your existing software and applications.

Essentially, our API allows you to unlock physical mail capability in your existing software platforms.

Why Businesses Love the ClickSend Post API

Super Reliable

Count on ClickSend to get your post delivered anywhere on the planet on time every time. With our 100% Uptime SLA Guarantee and fully automated, yet heavily monitored, fulfillment system you can send post at any level to anywhere with confidence.

Seamless API Integration

Integrate with ease with our comprehensive SDK library and API documentation. Built for developers, by developers, we know how to play nice with hundreds of other platforms. Sign up now to access your API key.


We can't wait to get you set up. Get in contact with us today or signup for a free trial to access our post API.

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