# Exegy

**Canonical:** https://apis.io/providers/exegy/  
**Website:** https://www.exegy.com/  
**APIs profiled:** 0

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.

## Kin Score — 8.7 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 8.7).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 10.5 |
| Access Clarity | 10.5 |

Regulatory layer — **Securities & Market Data**: 16.7 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Exegy Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Financial, Market Data, Trading, Real-Time, Low Latency, FPGA, Options, Feed Handlers, Order Book

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/exegy/). Scores are computed from the provider's own public artifacts under a published rubric.