MCP Server
Give the AI tools your team already uses safe, natural-language access to SymXchange over the Model Context Protocol — read-only by default, with writes off until you turn them on
NexumAPI
The fastest way to develop with SymXchange.
With NexumAPI, your systems can freely communicate with the Symitar core platform over SymXchange using our modern JSON / RESTful interface to rapidly engineer the next best credit union app using standard JSON data representation by default.
Originally unveiled at CU Build in 2023 — NexumAPI is a translation engine that translates SymXchange request/response payloads in the single millisecond range and that's for every service, every operation, on any supported version.
Oh, and we have interactive online docs for the entire SymXchange API.
New
Now your Symitar core speaks AI
Connect Claude, ChatGPT, Cursor, Codex, or any MCP-compatible client straight to SymXchange and ask for what you need in plain language. Read-only out of the box — with writes off by default, granular policy controls, confirmation for high-impact writes, and a full audit trail — so it's safe enough for a banking core.
“Look up the member tied to this debit card.”“What would a 72-month, $40k RV loan run per month?”“Verify check #1183 on this account.”
Read about NexumAPI MCPNexumAPI as a Service (NaaS)
Use NexumAPI as a ready-to-use service called "NaaS" for language agnostic implementation
Comprehensive Docs
Build out your NexumAPI requests with our beautiful documentation & API reference
HTTP Error Codes
We translated all SymXchange error responses to HTTP error codes for better stack management
Order Agnostic Requests
Let us worry about the order of the elements in your SymXchange requests
Form URL-Encoded
Easily send silent NaaS requests through custom PowerOn to bypass FM validation restrictions
Multi-Version Support
We maintain support for updating service versions with a 1-to-1 mapping to all SymX SOAP services and operations
SymXchange Passthrough Mode
Gain insight on all third-party connections to your SymXchange instance. Route all of your vendor's native SymXchange connections through us and we will record all of the activity for you
Improved Logging
Track all SymX requests and bubble up critical user information with zero configuration
VPN Tunneling
Opt-in to a VPN tunnel to securely connect to Libum-hosted NaaS
Managed infrastructure
We manage all of the infrastructure so that you don't have to
Authomatic updates
We automatically update NexumAPI on new releases without you needing to lift a finger
Load balancing & auto scaling
We will load balance requests and automatically provision new compute resources to meet any level of SymXchange demand
High availability
We host your NexumAPI instance in multiple availability zones to ensure that we are always operational, even if any zone goes down
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"NexumAPI isn't just another middleware or endpoint; it's a revolution for Jack Henry credit unions. It transforms the way we interact with the Symitar core, replacing outdated software and systems with a modern, streamlined approach. It significantly lowers the barrier to entry for working with the Symitar core via SymXchange."
Ray Satterfield, Programmer II @ Dover Federal Credit Union
Ray Satterfield, Programmer II @ Dover Federal Credit Union
Features
Support for all SymXchange SOAP services
Maintain 1-to-1 SymXchange version parity
Comprehensive Docs & SymX API reference
Language agnostic, ready-to-use service
AI access via the NexumAPI MCP server
Custom logging/monitoring of SymXchange usage
SymXchange Passthrough Mode
Optional VPN tunnel
Managed infrastructure
Automatic updates
Load balancing & auto scaling
High availability
FAQ
Yes. NexumAPI maps one-to-one to every SymXchange SOAP service and operation, and stays in version parity as your Symitar core updates — so you can reach anything SymXchange exposes with modern JSON instead of SOAP.
Either. Run NexumAPI yourself, or use NaaS (NexumAPI as a Service) — fully managed by Libum with an optional VPN tunnel, load balancing, automatic updates, and high availability.
Yes. The NexumAPI MCP server exposes the Symitar core through SymXchange to AI assistants over the Model Context Protocol, so your team can ask in plain language instead of hand-writing requests.
Any MCP-compatible client — including Claude, ChatGPT, Cursor, and Codex — can connect to the NexumAPI MCP server and work with your Symitar core.
Yes. The NexumAPI MCP server is read-only by default, keeps your SymXchange credentials separate from the AI, supports policy allowlists for approved tools, operations, credential types, and identities, requires confirmation for high-impact writes, and logs every call for a complete audit trail.
Yes. MCP inherits your NexumAPI service and version gating, then can be narrowed further with policy allowlists for specific MCP tools, SymXchange service verbs, operations, credential types, and authenticated user identities.
For the REST API you send JSON instead of SOAP, with no XML to wrangle. And with the NexumAPI MCP server you can skip code entirely — just ask your AI assistant in natural language.