Exegy
Exegy is a St. Louis-based provider of low-latency market data infrastructure, trading platforms, and predictive trading signals for capital markets, backed by Marlin Equity Partners after its 2021 merger with Vela Trading Systems and subsequent acquisitions of Enyx and NovaSparks. The firm sells managed FPGA ticker plants (Exegy Nexus), software feed handlers (SMDS, nxFeed), the Axiom normalized data feed, the Metro options trading platform, and market access products (nxAccess, FrontTrade, SREX). Client access to normalized real-time and historical market data is delivered through the proprietary Exegy Client API (XCAPI), a C++/C#/Java library for Linux and Windows, while Metro exposes the Subway socket API and Freeway algorithmic API - none of which are publicly documented HTTP APIs. All developer documentation sits behind customer logins (Exegy Customer Portal, Object Trading DMA portal, MarketDataPeaks), making this an entirely sales-gated, entitlement-managed offering with no self-serve API surface.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Exegy the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Exegy scores 13.9/100 (minimal), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Exegy
Each block below is one kind of artifact we hold for Exegy. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Exegy — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
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