MarketAxess

MarketAxess provides a leading electronic trading platform for corporate bond markets, offering deep liquidity, pre‑trade data, AI‑powered insights, and real‑time market depth analysis. Clients can access pricing, trade execution, and post‑trade services across investment‑grade, high‑yield, and emerging‑market bonds, supported by advanced analytics and a modern X‑Pro workflow.

MarketAxess is listed with 1 API on the APIs.io network. Tagged areas include Company, Finance, Trading, and Bonds.

MarketAxess’ developer surface includes support, pricing, and 5 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

9.4/100 minimal ▬ flat Agent 0/100 human only Heartbeat 77/100 alive Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 API

Company Finance Trading Bonds

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 9.4/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 3.1 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 3.8 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime (on an ambiguous tag, where no other regime matched), 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Access Clarity scores 18.4 — up to +16.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/marketaxess/apis.yml: open an issue on github.com/api-evangelist/marketaxess to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Capital Markets and Trading	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

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

MarketAxess GraphQL API

GraphQL API for MarketAxess platform

Security Posture 1

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

Marketaxess Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Access & Security 2

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 2

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: marketaxess
name: MarketAxess
description: MarketAxess provides a leading electronic trading platform for corporate bond markets, offering deep liquidity,
  pre‑trade data, AI‑powered insights, and real‑time market depth analysis. Clients can access pricing, trade execution, and
  post‑trade services across investment‑grade, high‑yield, and emerging‑market bonds, supported by advanced analytics and
  a modern X‑Pro workflow.
url: https://raw.githubusercontent.com/api-evangelist/marketaxess/refs/heads/main/apis.yml
x-type: company
x-source: harvest:market-data
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-21 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-09-21'
modified: '2026-10-06'
tags:
- Company
- Finance
- Trading
- Bonds
tags_raw:
- Company
- Finance
- Trading
- Bonds
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.marketaxess.com/rss.xml
  type: BlogRSS
- type: TrustCenter
  url: https://trust.marketaxess.com/
- type: DeveloperPortal
  url: https://portal.marketaxess.com/
- type: DomainSecurity
  url: security/marketaxess-domain-security.yml
- type: Website
  url: https://www.marketaxess.com/
- type: Support
  url: https://www.marketaxess.com/contact-us
- type: Pricing
  url: https://www.marketaxess.com/price/axess-all
apis:
- name: MarketAxess GraphQL API
  description: GraphQL API for MarketAxess platform
  humanURL: https://portal.marketaxess.com/
  properties: []
  aid: marketaxess:marketaxess-graphql-api
x-enrichment:
  date: '2026-09-21'
  status: enriched
  artifacts_added: 3
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local

MarketAxess API — frequently asked questions

Does MarketAxess have an API?

Yes. APIs.io lists 1 API from MarketAxess, including MarketAxess GraphQL API.

Is the MarketAxess API ready for AI agents?

MarketAxess has a Kin Score of 9.4 out of 100 (minimal) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-02.

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