Capital Markets Gateway

Capital Markets Gateway (CMG) is a New York headquartered financial technology company that connects the buy side and the sell side across the equity capital markets (ECM) offering process. Its two products are CMG XC, a workflow-management platform carrying the full ECM deal lifecycle — offering setup, termsheet publication, a consolidated and de-duplicated order book, bookbuilding, allocations, designations and trade release — and CMG DataLab, an ECM data and analytics service spanning 20+ years and 60,000+ equity transactions across 50+ regions, with 550+ deal, structure and performance metrics per deal. CMG names three programmatic surfaces in its own public FAQs — a DataLab Real-Time Feed (GraphQL API), a CMG XC REST API covering setup through allocation and post-trade, and EventHub real-time event notifications for straight-through processing into OMS and trade-processing systems — but publishes no public API reference, endpoint or machine-readable contract for any of them. The documentation host redirects to a customer identity login.

Capital Markets Gateway publishes 3 APIs on the APIs.io network. Tagged areas include Company, Financial-Services, Capital Markets, Equity Capital Markets, and Market Data.

The Capital Markets Gateway catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Capital Markets Gateway’s developer surface includes engineering blog, signup flow, support, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

28.9/100 thin ▬ flat Agent 17/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

3 APIs

Company Financial-Services Capital Markets Equity Capital Markets Market Data Data Intelligence Workflow Management Investment Banking Fintech

Kin Score

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

Composite quality — 28.9/100 · thin

Contract Quality 8.8 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 5.8 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.9 / 10

Discoverability 6.1 / 9

Regulatory Posture 4.8 / 15

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 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 6 / 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/capital-markets-gateway: 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 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

CMG DataLab Real-Time Feed (GraphQL API)

Schema-driven GraphQL access to CMG's live and historical ECM dataset. Per CMG's published FAQ the feed lets teams "query specific fields across deals, participants, terms and a...

CMG XC REST API

REST API for the CMG XC workflow platform. Per CMG's published FAQ it provides "systemic support of the full ECM deal lifecycle from setup through allocation and post-trade" and...

CMG XC EventHub

Real-time event notification surface for CMG XC. Per CMG's published FAQ, "real-time event notifications are delivered via EventHub, enabling STP integration with internal trade...

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Capital Markets Gateway Eventhub

ASYNCAPI

Security Posture 1

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

Capital Markets Gateway Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Webhooks

Webhooks

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

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 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 5

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Twitter

Twitter

Source (apis.yml)

aid: capital-markets-gateway
name: Capital Markets Gateway
description: Capital Markets Gateway (CMG) is a New York headquartered financial technology company that connects the buy
  side and the sell side across the equity capital markets (ECM) offering process. Its two products are CMG XC, a workflow-management
  platform carrying the full ECM deal lifecycle — offering setup, termsheet publication, a consolidated and de-duplicated
  order book, bookbuilding, allocations, designations and trade release — and CMG DataLab, an ECM data and analytics service
  spanning 20+ years and 60,000+ equity transactions across 50+ regions, with 550+ deal, structure and performance metrics
  per deal. CMG names three programmatic surfaces in its own public FAQs — a DataLab Real-Time Feed (GraphQL API), a CMG XC
  REST API covering setup through allocation and post-trade, and EventHub real-time event notifications for straight-through
  processing into OMS and trade-processing systems — but publishes no public API reference, endpoint or machine-readable contract
  for any of them. The documentation host redirects to a customer identity login.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-09-02'
  method: derived
image: https://cmgx.io/wp-content/uploads/2024/11/CMG_URLPreview_2024-11-06-min-1-scaled.jpg
url: https://raw.githubusercontent.com/api-evangelist/capital-markets-gateway/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-api-posture-note: 'CMG names three programmatic surfaces in its own public FAQs — a DataLab Real-Time Feed (GraphQL API),
  a CMG XC REST API covering setup through allocation and post-trade, and EventHub real-time event '
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enriched-from-public-developer-surface
specificationVersion: '0.23'
created: '2026-08-09'
modified: '2026-08-09'
tags:
- Company
- Financial-Services
- Capital Markets
- Equity Capital Markets
- Market Data
- Data Intelligence
- Workflow Management
- Investment Banking
- Fintech
tags_raw:
- Company
- Financial Services
- Capital Markets
- Equity Capital Markets
- Market Data
- Data Intelligence
- Workflow Management
- Investment Banking
- Fintech
apis:
- aid: capital-markets-gateway-datalab-real-time-feed
  name: CMG DataLab Real-Time Feed (GraphQL API)
  description: Schema-driven GraphQL access to CMG's live and historical ECM dataset. Per CMG's published FAQ the feed lets
    teams "query specific fields across deals, participants, terms and activity through a single flexible endpoint" and stream
    live ECM data into internal data warehouses, dashboards, pricing models, risk systems and analytics tools. No public endpoint,
    SDL or reference is published; access is arranged through CMG and documentation sits behind a customer login.
  humanURL: https://cmgx.io/data-insights/
  tags:
  - GraphQL
  - Market Data
  - Equity Capital Markets
  - Real-Time Data
  properties:
  - type: x-access
    url: https://cmgx.io/book-a-demo/
- aid: capital-markets-gateway-xc-rest-api
  name: CMG XC REST API
  description: REST API for the CMG XC workflow platform. Per CMG's published FAQ it provides "systemic support of the full
    ECM deal lifecycle from setup through allocation and post-trade" and "integrates with CRM, OMS and trade processing systems
    for straight-through processing with buy-side participants." Allocations can be released and consumed electronically via
    the REST API. No public endpoint, OpenAPI or reference is published.
  humanURL: https://cmgx.io/workflow-management/
  tags:
  - REST
  - Equity Capital Markets
  - Order Management
  - Straight-Through Processing
  properties:
  - type: x-access
    url: https://cmgx.io/book-a-demo/
- aid: capital-markets-gateway-eventhub
  name: CMG XC EventHub
  description: Real-time event notification surface for CMG XC. Per CMG's published FAQ, "real-time event notifications are
    delivered via EventHub, enabling STP integration with internal trade processing and OMS platforms," connecting platform
    events such as trade release, allocation updates and attestation status changes into internal workflows. No AsyncAPI,
    event catalog or subscription reference is published.
  humanURL: https://cmgx.io/workflow-management/
  tags:
  - Event
  - Streaming
  - Equity Capital Markets
  tags_raw:
  - Events
  - Streaming
  - Equity Capital Markets
  properties:
  - type: Webhooks
    url: asyncapi/capital-markets-gateway-eventhub.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://cmgx.io/
- type: Blog
  url: https://cmgx.io/news-insights/
- type: BlogRSS
  url: https://cmgx.io/feed/
- type: SignUp
  url: https://cmgx.io/sign-up/
- type: Support
  url: https://cmgx.io/contact/
- type: TermsOfService
  url: https://cmgx.io/terms-of-use/
- type: PrivacyPolicy
  url: https://cmgx.io/privacy-policy/
- type: GitHubOrganization
  url: https://github.com/capital-markets-gateway
- type: LinkedIn
  url: https://www.linkedin.com/company/cmg-capital-markets-gateway
- type: Twitter
  url: https://twitter.com/cmgxio
- type: LLMsTxt
  url: llms/capital-markets-gateway-llms.txt
- type: Webhooks
  url: asyncapi/capital-markets-gateway-eventhub.yml
- type: Conformance
  url: conformance/capital-markets-gateway-conformance.yml
- type: DomainSecurity
  url: security/capital-markets-gateway-domain-security.yml
x-enrichment:
  date: '2026-08-09'
  status: minimal
  artifacts_added: 5
  pass: local-v1
x-coverage:
  state: gated
  reason: customer-only-docs
  detail: CMG names three programmatic surfaces in its own public FAQs — a DataLab Real-Time Feed (GraphQL API), a CMG XC
    REST API and EventHub event notifications — but its documentation host docs.cmgx.io 302s to a Document360 knowledge base
    behind the id.cmgecm.com customer identity gate, so no endpoint, GraphQL SDL, OpenAPI or event catalog is reachable without
    an active tenant.
  evidence:
  - url: https://docs.cmgx.io/
    status: 302
  - url: https://cmgx.io/developers/
    status: 404
  - url: https://cmgx.io/openapi.json
    status: 404
  - url: https://cmgx.io/data-insights/
    status: 200
  checked: '2026-08-09'

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