100% native RPGLE. No Java. No middleware. No open source risk. Talk to one of our RPG developers and see it working in your own IBM i environment — within days, not weeks.
Get a free, no-pressure conversation with one of our IBM i experts — and a working proof of concept built for your environment.
Modernization doesn't mean abandoning what works. RPG API Express helps your business unlock the true potential of the RPG language — no ripping and replacing, just extending what you already have.
RPG API Express is a library of commands and subprocedures designed to simplify and streamline RPG-based API development. Build applications faster with utilities, code generators, and a vast array of powerful tools.
RPG API Express is built using 100% RPG, optimizing your development and providing lightning-fast responses. RPG API Express utilizes the IBM i to its fullest capacity — no JVM overhead, no middleware latency.
When you reach out to Kato, you get direct access to a team of seasoned RPG programmers who have solved these exact problems before — not a support ticket queue or an account executive reading from a script.
RPG API Express has been used to connect IBM i systems to dozens of real-world APIs. Here's a sample of what your team can integrate with out of the box.
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 Ginzburg Fidelitone
With the help of RPG API Express I was able to cut my personal project time in half. It runs natively in RPG with Apache giving it excellent performance.Bruce "Hoss" Collins Houston County, Alabama
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 Yung Spartan Insurance
I followed some example code on your website and have a simple app up and running very similar to what my client needs. Your software is making me look like a hero!Carl Galgano EDI Consulting
When you fill out the form, you're not starting a sales process — you're starting a technical one. Here's exactly what our RPG developers do with your information.
Send us your API documentation and internal requirements. Our team will determine the best course of action for your specific use case.
With your requirements in hand, our RPG developers build a callable, deployable program tailored specifically to your IBM i environment.
See RPG API Express in action in your own environment. You'll also receive a fully-featured 30-day trial license to keep exploring.
No pitch, no pressure. Tell us what you're trying to build on IBM i and we'll tell you honestly if RPG API Express is the right fit — and show you a working proof of concept either way.
No sales calls · No pitch decks · Just RPG developers who know IBM i