Citadel Securities

Citadel Securities is one of the world's leading market makers and electronic trading firms, providing liquidity and price discovery across equities, options, exchange-traded funds, fixed income, currencies, and commodities for institutional and retail investors globally. Founded in 2002 by Ken Griffin, the firm operates a high-performance, technology-driven trading platform. It is a privately held financial-services company and does not publish a public developer API or developer portal; this profile tracks its identity and public infrastructure posture within the API Evangelist network.

Citadel Securities is profiled on the APIs.io network. Tagged areas include Company, Fintech, Financial-Services, Market Maker, and Electronic Trading.

🌐 Visit website 📡 Source on GitHub

1.2/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Company Fintech Financial-ServicesMarket MakerElectronic Trading Liquidity Capital Markets

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 1.2/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 1.5 / 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

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.

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/. This rating is computed from github.com/api-evangelist/citadel-securities: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: citadel-securities
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/citadel-securities.png
name: Citadel Securities
description: Citadel Securities is one of the world's leading market makers and electronic trading firms, providing liquidity
  and price discovery across equities, options, exchange-traded funds, fixed income, currencies, and commodities for institutional
  and retail investors globally. Founded in 2002 by Ken Griffin, the firm operates a high-performance, technology-driven trading
  platform. It is a privately held financial-services company and does not publish a public developer API or developer portal;
  this profile tracks its identity and public infrastructure posture within the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/citadel-securities/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- paradigm
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Fintech
- Financial-Services
- Market Maker
- Electronic Trading
- Liquidity
- Capital Markets
tags_raw:
- Company
- Fintech
- Financial Services
- Market Maker
- Electronic Trading
- Liquidity
- Capital Markets
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/citadel-securities-domain-security.yml
- type: Website
  url: https://www.citadelsecurities.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Citadel Securities

Kin Score

Security Posture 1

Citadel Securities Domain Security

Resources

Access & Security 1

Company 1

Source (apis.yml)