Turn legacy business logic into governed APIs, fast
Expose the business logic trapped in your mainframe and IBM i systems as governed APIs, without rewriting a line of core code. Legacy and modern run side by side the whole way.
Why legacy integration keeps stalling
The systems that run your business are the hardest ones to connect, and the usual approaches move the cost around instead of removing it.
Systems that will not connect
Mainframe and IBM i logic sits locked in COBOL programs, 3270 and 5250 screens, and messaging layers. Reaching it usually means bespoke code, deep platform knowledge, and a long test cycle for every single operation.
Custom connectivity just relocates the cost
Hand-rolled integration does not make the work go away. Each new endpoint still needs someone to interpret the asset, map it field by field, and contract test it. The bill shows up again with every project.
Scarce skills and low tolerance for risk
The people who understand these systems are retiring, and the systems themselves cannot go down. That combination makes teams hesitant to touch core platforms at all, and modernization stalls before it starts.
And now agentic AI raises the stakes. Agents need clean, API-driven access to the same mainframe and IBM i logic, so the integration gap that was an IT inconvenience becomes a blocker for the AI initiatives the business is counting on.
Ship integrations that hold up in production
OpenLegacy handles the whole path from legacy asset to governed API: discover the operation once, define the contract, generate the endpoints your consumers need, and validate every change before anything moves. Here is what that gives your teams.
Many endpoint styles from one contract
Define the API contract once in OpenLegacy Hub, then generate REST, Kafka, IBM MQ, Serverless, and SOAP endpoints from it. No rebuilding the same integration for every consumer, and up to 10x faster time to market than a custom connector build.
Expose screens and programs without a rewrite
Turn RPC calls and 3270 and 5250 terminal Screens Flows into testable APIs while the systems of record stay exactly as they are. Legacy and modern systems keep running side by side, so you get zero big-bang risk and no downtime to mission-critical operations.
Reuse what you already have
Start from a versioned, testable catalog of operations that OpenLegacy has already discovered, instead of rediscovering and mapping each asset from scratch. Reusing existing business logic instead of rewriting it cuts legacy integration and mainframe costs by up to 60 percent, with no legacy skills required.
Governed, tested, and automation ready
Every API is contract first and validated in Test Center, with CLI automation that plugs into your CI/CD pipeline. The same governed APIs that serve your modern applications also give enterprise AI clean, governed access to legacy logic when you are ready for it.
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