IEX

IEX Group, Inc. operates IEX Exchange, a U.S. national securities exchange for equities founded to make trading fairer and more transparent, along with IEX Options (coming soon). IEX is known for its Speed Bump, the IEX Signal, and the D-Limit order type. Its developer- and data-facing surface is market data and connectivity rather than a public REST API: real-time depth-of-book and top-of-book feeds (DEEP+, DEEP, and TOPS, plus their SNAP variants) are distributed over the binary IEX Transport Protocol (IEX-TP v1), with published feed specifications, downloadable historical PCAP samples, and market statistics. Data access is arranged through a Data Subscriber Agreement and direct or third-party connectivity. Sector: fintech / financial markets infrastructure. Backed by Bain Capital Ventures, ICONIQ Capital, IVP, and Sapphire Ventures.

IEX is profiled on the APIs.io network. Tagged areas include Company, Fintech, Stock Exchange, Market Data, and Trading.

IEX’s developer surface includes documentation, API reference, pricing, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

17.4/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Company Fintech Stock Exchange Market Data Trading Equities Options Financial-Services Market Infrastructure

Kin Score

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

Composite quality — 17.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 6.5 / 17

Operational Transparency 1.7 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 3.5 / 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/iex: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: iex
name: IEX
description: 'IEX Group, Inc. operates IEX Exchange, a U.S. national securities exchange for equities founded to make trading
  fairer and more transparent, along with IEX Options (coming soon). IEX is known for its Speed Bump, the IEX Signal, and
  the D-Limit order type. Its developer- and data-facing surface is market data and connectivity rather than a public REST
  API: real-time depth-of-book and top-of-book feeds (DEEP+, DEEP, and TOPS, plus their SNAP variants) are distributed over
  the binary IEX Transport Protocol (IEX-TP v1), with published feed specifications, downloadable historical PCAP samples,
  and market statistics. Data access is arranged through a Data Subscriber Agreement and direct or third-party connectivity.
  Sector: fintech / financial markets infrastructure. Backed by Bain Capital Ventures, ICONIQ Capital, IVP, and Sapphire Ventures.'
url: https://raw.githubusercontent.com/api-evangelist/iex/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- bain-capital-ventures
- iconiq-capital
- ivp
- sapphire-ventures
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
image: https://cdn.prod.website-files.com/63bc910a330e72662c5681bc/640645b90ac2aca1a1409fa6_IEX_Open-Graph.jpg
tags:
- Company
- Fintech
- Stock Exchange
- Market Data
- Trading
- Equities
- Options
- Financial-Services
- Market Infrastructure
tags_raw:
- Company
- Fintech
- Stock Exchange
- Market Data
- Trading
- Equities
- Options
- Financial Services
- Market Infrastructure
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.iex.io/
- type: Documentation
  url: https://www.iex.io/resources/trading/documents
- type: APIReference
  url: https://www.iex.io/resources/trading/market-data
- type: Pricing
  url: https://www.iex.io/resources/trading/fee-schedule
- type: StatusPage
  url: https://notifications.iex.io/status
- type: Blog
  url: https://www.iex.io/news
- type: Login
  url: https://auth.iextrading.com/
- type: TermsOfService
  url: https://www.iex.io/legal/terms
- type: PrivacyPolicy
  url: https://www.iex.io/legal/privacy
- type: DomainSecurity
  url: security/iex-domain-security.yml
- type: LLMsTxt
  url: llms/iex-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

IEX