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 10 API contracts indexed on the APIs.io network, including Derivatives API, Equities API, Fins API, and 7 more. Tagged areas include Financial Data, Investment, Japan, and Stock Market.

The J-Quants catalog on APIs.io includes 1 Spectral governance ruleset.

J-Quants’ developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.5/100 emerging ▬ flat Agent 20/100 agent aware Front door AI 2/6 trace Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Financial Data Investment Japan Stock Market

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 25.5/100 · emerging

Contract Quality 8.6 / 19

Developer Ergonomics 3.2 / 15

Access Clarity 1.2 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.2 / 9

Discoverability 4.8 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

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 Horizontal (data, software, accessibility, platform) 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 21.4 — up to +15.7 composite points
Contract Quality scores 45.7 — up to +13.6 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/j-quants/apis.yml: open an issue on github.com/api-evangelist/j-quants 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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.

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Open Collections 10

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

J-Quants Derivatives API

OPEN COLLECTION

J-Quants Derivatives Equities API

OPEN COLLECTION

J-Quants Derivatives Fins API

OPEN COLLECTION

J-Quants Derivatives Indices API

OPEN COLLECTION

J-Quants Derivatives Listed API

OPEN COLLECTION

J-Quants Derivatives Markets API

OPEN COLLECTION

J-Quants Derivatives Option API

OPEN COLLECTION

J-Quants Derivatives Prices API

OPEN COLLECTION

J-Quants Derivatives Token API

OPEN COLLECTION

J-Quants API

OPEN COLLECTION

Scroll for all 10

J-Quants API pricing

Not yet checked against J-Quants's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against J-Quants's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

J-Quants

SLA

FinOps 1

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

J Quants Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

J-Quants API Rules

47 rules · 45 errors 1 warnings 1 info

SPECTRAL

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

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

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

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
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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: '0.23'
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
  - Stocks
  tags_raw:
  - 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:
  - Stocks
  tags_raw:
  - 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:
  - Tokens
  tags_raw:
  - Token
  properties:
  - type: OpenAPI
    url: openapi/j-quants-token-api-openapi.yml
common:
- type: Plans
  url: plans/j-quants-plans-pricing.yml
- type: RateLimits
  url: rate-limits/j-quants-rate-limits.yml
- type: FinOps
  url: finops/j-quants-finops.yml
- 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

J-Quants API — frequently asked questions

Does J-Quants have an API?

Yes. APIs.io lists 10 APIs from J-Quants, including J-Quants API, J-Quants Derivatives API and J-Quants Equities API, and 7 more.

Is there an OpenAPI specification for the J-Quants API?

Yes. APIs.io indexes 9 OpenAPI specifications for J-Quants, each linked for download from this page.

How do I authenticate with the J-Quants API?

J-Quants uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as J Quants Authentication.

How much does the J-Quants API cost?

APIs.io lists 3 pricing plans for J-Quants, with each plan's price, limits and inclusions under Pricing on this page.

Is the J-Quants API ready for AI agents?

J-Quants has a Kin Score of 25.5 out of 100 (emerging) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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