Simple integrations for your IBM i

RPG-based IBM i toolkits designed to simplify your integration needs

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Enhance your IBM i like never before. Get in touch to learn more.

RPG-based solution

A 100% RPG-based solution saves you from hybridizing your development with open source, helping you create the most secure integration on your IBM i. RPG API Express helps you develop secure programs up to current TLS standards.

RPG API experts

Get access to a team of RPG development experts for assistance when you need it. Our professional services staff has implemented hundreds of APIs using both REST and SOAP for JSON and XML environments. We extend your team's capabilities to ensure every project is delivered on-time at the highest quality.

Hyper responsive

Our one-solution approach gives you the ability to connect your IBM i to 3rd party applications, giving you access to valuable partner data without having to rely on a patchwork of open source options. Accelerate application development with a suite of tools to build RPG-based web APIs.

What We Offer

Comprehensive API solutions for your IBM i environment

Written in 100% RPG
Fully team supported
Integrate with REST and SOAP APIs
Compose and parse JSON & XML
Secure, dependable TLS encryption

Connect with popular APIs
Real-time communication
Seamless integration with RPG code
Postal and credit card solutions
Build at lightning speeds

Most affordable hosting solution
99.990% uptime guarantee
Loads of pre-installed software
Month-to-month contracts
100% free setup, no commitment

RPG API Express lets you connect with these powerful APIs...

Professional Services

Kato Professional Services extends your team

Enhance your IBM i web service environment with Kato Professional Services - a package solution to RPG web services
Focus on what matters most, growing your business
We can build your web service environment using RXS
Years of ILE experience necessary to solve the most complex issues that come with API communication

The support team for Kato Integrations is very knowledgeable and their response time is better than the rest. I would recommend it to any iSeries company.

Ron KoontzContinental Express, Inc.

Customer Stories

Hear from our customers

With the help of RPG API Express I was able to cut my personal project time in half. RPG API Express is a proven toolset that allows for easy creation of JSON web services from RPG. I’d recommend it to anyone on the IBM i / AS400 platform because it runs natively in RPG with Apache giving it excellent performance!

Bruce ‘Hoss’ CollinsHouston County, Alabama

I followed some example code on your website and have a simple app up and running very similar to what my client needs. I just need to adapt it to their JD Edwards World Database. Your software is making me look like a hero!

Carl GalganoEDI Consulting

Utilizing RPG API Express with great guidance from the Krengeltech support team we successfully consume UPS web services to create electronic return labels. This is the best package support I’ve received from my 15 years of IBM i/AS400 experience.

Alla GinzburgFidelitone

RPG API Express enables us to communicate from our IBM i in real-time with our credit vendors, and the implementation was quick and easy. I would recommend it to anyone.

Margaret YungSpartan Insurance

Your Team

Our service benefits your entire team

Try RPG API Express

Try RPG API Express in your environment with a 100% free proof of concept and fully-featured 30-day trial.

Customer Feedback

Our team of expert IBM i developers work with you to provide answers and customized solutions for your next API project.

Our Process

Discuss, develop, and deploy - with only a few short steps, you'll receive a solution to your API problem.

No Obligation

We'll let you try RPG API Express 100% free of charge with zero billing information required.