J-Quants website screenshot

J-Quants

J-Quants is a financial data API service operated by Japan Exchange Group (JPX) that makes it easy for retail investors to obtain cleansed financial data such as stock prices and financials in historical format. The service democratizes access to raw financial data for investment analysis.

J-Quants publishes 9 APIs on the APIs.io network, including Derivatives API, Equities API, Fins API, and 6 more. Tagged areas include Financial Data, Investment, Japan, and Stock Market.

J-Quants’ developer surface includes authentication, documentation, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.6/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
10 APIs
Financial DataInvestmentJapanStock Market

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 36.6/100 · thin
Contract Quality 13.5 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 6.5 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 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
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/j-quants: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

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

J-Quants API

The J-Quants API (V2) is a data distribution service operated by Japan Exchange Group (JPX) that makes it easy to obtain cleansed financial data such as Japanese stock prices an...

J-Quants Derivatives API

The Derivatives API from J-Quants — 2 operation(s) for derivatives.

J-Quants Equities API

The Equities API from J-Quants — 1 operation(s) for equities.

J-Quants Fins API

The Fins API from J-Quants — 4 operation(s) for fins.

J-Quants Indices API

The Indices API from J-Quants — 1 operation(s) for indices.

J-Quants Listed API

The Listed API from J-Quants — 1 operation(s) for listed.

J-Quants Markets API

The Markets API from J-Quants — 7 operation(s) for markets.

J-Quants Option API

The Option API from J-Quants — 1 operation(s) for option.

J-Quants Prices API

The Prices API from J-Quants — 2 operation(s) for prices.

J-Quants Token API

The Token API from J-Quants — 2 operation(s) for token.

Scroll for all 10

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

J-Quants API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

J Quants Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

J Quants Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

J Quants Finops

FINOPS

Security Posture 2

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

J Quants Authentication

apiKey · 2 schemes

SECURITY

J Quants Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

J Quants Agentic Access

21 operations · 2 acting

21 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: j-quants
name: J-Quants
description: J-Quants is a financial data API service operated by Japan Exchange Group (JPX) that makes it easy for retail
  investors to obtain cleansed financial data such as stock prices and financials in historical format. The service democratizes
  access to raw financial data for investment analysis.
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/j-quants.png
tags:
- Financial Data
- Investment
- Japan
- Stock Market
created: '2025-02-12'
modified: '2026-04-28'
url: https://raw.githubusercontent.com/api-evangelist/j-quants/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: j-quants:j-quants-api
  name: J-Quants API
  description: The J-Quants API (V2) is a data distribution service operated by Japan Exchange Group (JPX) that makes it easy
    to obtain cleansed financial data such as Japanese stock prices and financials in historical format, enabling investment
    analysis. Authentication is via API key passed in the x-api-key header.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Financial Data
  - Japan
  - Stock Market
  - Equities
  properties:
  - type: Documentation
    url: https://jpx-jquants.com/
- aid: j-quants:j-quants-derivatives-api
  name: J-Quants Derivatives API
  description: The Derivatives API from J-Quants — 2 operation(s) for derivatives.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Derivatives
  properties:
  - type: OpenAPI
    url: openapi/j-quants-derivatives-api-openapi.yml
- aid: j-quants:j-quants-equities-api
  name: J-Quants Equities API
  description: The Equities API from J-Quants — 1 operation(s) for equities.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Equities
  properties:
  - type: OpenAPI
    url: openapi/j-quants-equities-api-openapi.yml
- aid: j-quants:j-quants-fins-api
  name: J-Quants Fins API
  description: The Fins API from J-Quants — 4 operation(s) for fins.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Fins
  properties:
  - type: OpenAPI
    url: openapi/j-quants-fins-api-openapi.yml
- aid: j-quants:j-quants-indices-api
  name: J-Quants Indices API
  description: The Indices API from J-Quants — 1 operation(s) for indices.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Indices
  properties:
  - type: OpenAPI
    url: openapi/j-quants-indices-api-openapi.yml
- aid: j-quants:j-quants-listed-api
  name: J-Quants Listed API
  description: The Listed API from J-Quants — 1 operation(s) for listed.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Listed
  properties:
  - type: OpenAPI
    url: openapi/j-quants-listed-api-openapi.yml
- aid: j-quants:j-quants-markets-api
  name: J-Quants Markets API
  description: The Markets API from J-Quants — 7 operation(s) for markets.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Markets
  properties:
  - type: OpenAPI
    url: openapi/j-quants-markets-api-openapi.yml
- aid: j-quants:j-quants-option-api
  name: J-Quants Option API
  description: The Option API from J-Quants — 1 operation(s) for option.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Option
  properties:
  - type: OpenAPI
    url: openapi/j-quants-option-api-openapi.yml
- aid: j-quants:j-quants-prices-api
  name: J-Quants Prices API
  description: The Prices API from J-Quants — 2 operation(s) for prices.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Prices
  properties:
  - type: OpenAPI
    url: openapi/j-quants-prices-api-openapi.yml
- aid: j-quants:j-quants-token-api
  name: J-Quants Token API
  description: The Token API from J-Quants — 2 operation(s) for token.
  humanURL: https://jpx-jquants.com/
  baseURL: https://api.jquants.com/
  tags:
  - Token
  properties:
  - type: OpenAPI
    url: openapi/j-quants-token-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/j-quants-agentic-access.yml
- type: DomainSecurity
  url: security/j-quants-domain-security.yml
- type: Authentication
  url: authentication/j-quants-authentication.yml
- type: GitHubOrganization
  url: https://github.com/J-Quants
- type: Website
  url: https://jpx-jquants.com/
- type: Documentation
  url: https://jpx-jquants.com/
- type: LlmsText
  url: https://jpx-jquants.com/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com