Woodstock

Woodstock (Woodstock K.K., Tokyo) is a Japanese investment platform offering zero-commission, 24-hour US stock trading in JPY with fractional shares down to 0.0001-share increments. A Financial Products Intermediary registered with the Kanto Financial Bureau (No. 965), with customer assets held by affiliated broker AlpacaJapan, Woodstock's programmatic surface is a hosted Model Context Protocol server that lets AI agents like Claude, ChatGPT, and Grok manage portfolios, research US stocks, and place real trades after OAuth plus passkey authorization. Backed by Kindred Ventures, Coinbase, and Sony.

Woodstock is profiled on the APIs.io network. Tagged areas include Company, Investing, Stock Trading, Brokerage, and Fintech.

Woodstock’s developer surface includes authentication, documentation, getting-started guide, signup flow, pricing, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

27.4/100 thin ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessSelf serve

0 APIs 1 MCP Servers

CompanyInvestingStock TradingBrokerageFintechJapanMCPAI Agents

Kin Score

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

Composite quality — 27.4/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 6.9 / 17

Access Clarity 7.6 / 17

Operational Transparency 0.3 / 11

Contract Governance 1.9 / 10

Discoverability 5.8 / 9

Regulatory Posture 6.3 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 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/woodstock: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

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: woodstock
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/woodstock.png
name: Woodstock
description: Woodstock (Woodstock K.K., Tokyo) is a Japanese investment platform offering zero-commission, 24-hour US stock
  trading in JPY with fractional shares down to 0.0001-share increments. A Financial Products Intermediary registered with
  the Kanto Financial Bureau (No. 965), with customer assets held by affiliated broker AlpacaJapan, Woodstock's programmatic
  surface is a hosted Model Context Protocol server that lets AI agents like Claude, ChatGPT, and Grok manage portfolios,
  research US stocks, and place real trades after OAuth plus passkey authorization. Backed by Kindred Ventures, Coinbase,
  and Sony.
url: https://raw.githubusercontent.com/api-evangelist/woodstock/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- kindred-ventures
x-tier: enriched
x-tier-reason: hosted-mcp-server
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Investing
- Stock Trading
- Brokerage
- Fintech
- Japan
- MCP
- AI Agents
tags_raw:
- Company
- Investing
- Stock Trading
- Brokerage
- FinTech
- Japan
- MCP
- AI Agents
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://woodstock.co/
- type: MCPServer
  url: mcp/woodstock-mcp.yml
- type: WellKnown
  url: well-known/woodstock-well-known.yml
- type: Authentication
  url: authentication/woodstock-authentication.yml
- type: Conformance
  url: conformance/woodstock-conformance.yml
- type: LLMsTxt
  url: llms/woodstock-llms.txt
- type: DomainSecurity
  url: security/woodstock-domain-security.yml
- type: Documentation
  url: https://woodstock.co/ja/mcp
- type: GettingStarted
  url: https://woodstock.co/ja/mcp/installation/getting-started
- type: SignUp
  url: https://woodstock.co/ja/signup
- type: Pricing
  url: https://woodstock.co/ja/fees
- type: Support
  url: https://woodstock.co/ja/faq
- type: Blog
  url: https://zenn.dev/p/woodstock_tech
- type: GitHubOrganization
  url: https://github.com/woodstock-tokyo
- type: TermsOfService
  url: https://woodstock.co/ja/legal/term-of-use
- type: PrivacyPolicy
  url: https://woodstock.co/ja/legal/privacy-policy
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 8
  pass: local-v1