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.

Exegy is profiled on the APIs.io network. Tagged areas include Financial, Market Data, Trading, Real-Time, and Low Latency.

Exegy’s developer surface includes developer portal, engineering blog, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

8.7/100 minimal ▬ flat Agent 0/100 human only library Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 8.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/exegy: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Exegy Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 2

SDKs, sample code, and the tooling you integrate with

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Source (apis.yml)

aid: exegy
url: https://raw.githubusercontent.com/api-evangelist/exegy/refs/heads/main/apis.yml
name: Exegy
kind: company
description: 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.
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/exegy.png
tags:
- Financial
- Market Data
- Trading
- Real-Time
- Low Latency
- FPGA
- Options
- Feed Handlers
- Order Book
created: '2026-07-21'
modified: '2026-07-22'
specificationVersion: '0.23'
apis: []
common:
- type: DomainSecurity
  url: security/exegy-domain-security.yml
- type: LLMsTxt
  url: llms/exegy-llms.txt
- type: Packages
  url: packages/exegy-packages.yml
- type: Website
  url: https://www.exegy.com/
- type: Portal
  url: https://exegy.com/portal
- type: Blog
  url: https://www.exegy.com/category/insights/
- type: Support
  url: https://www.exegy.com/support/
- type: PrivacyPolicy
  url: https://www.exegy.com/legal-patents-privacy/
- type: GitHubOrganization
  url: https://github.com/exegy
- type: LinkedIn
  url: https://www.linkedin.com/company/exegy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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