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 📡 Profile data on GitHub

25.8/100 emerging ▬ flat Agent 27/100 agent aware Front door AI 4/6 moderate Heartbeat 54/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

0 APIs 1 MCP Servers

Company Investing Stock Trading Brokerage Fintech Japan MCP AI Agents Financial Services

Kin Score

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

Composite quality — 25.8/100 · emerging

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 5.0 / 9

Regulatory Posture 3.5 / 15

Agent readiness — 27/100 · 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

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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, 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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<a href="https://apis.io/providers/woodstock/"><img src="https://apis.io/badge/woodstock/card.svg" alt="Woodstock on APIs.io — Kin Score by API Evangelist"></a>

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

8 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
Operational Transparency scores 2.6 — up to +12.7 composite points
Developer Ergonomics scores 40.5 — up to +11.9 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/woodstock/apis.yml: open an issue on github.com/api-evangelist/woodstock 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
Japan FSA Registered Fintech (crypto exchanges, stablecoin intermediaries, funds transfer, bank-API agents, prepaid)	undeclared	-	-	-

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.

Standards implemented 3

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

MCP Servers 1

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

Woodstock MCP Server

Remote MCP server at mcp.app.woodstock.co over HTTP.

MCP SERVER

Security Posture 2

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

Woodstock Authentication

oauth2 · 1 scheme

SECURITY

Woodstock Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

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
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: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  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
- Financial Services
tags_raw:
- Company
- Investing
- Stock Trading
- Brokerage
- FinTech
- Japan
- MCP
- AI Agents
- Financial Services
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

Woodstock API — frequently asked questions

How do I authenticate with the Woodstock API?

Woodstock documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Woodstock Authentication.

Does Woodstock have an MCP server?

Yes. APIs.io lists 1 MCP server for Woodstock: Remote MCP server at mcp.app.woodstock.co over HTTP.

Is the Woodstock API ready for AI agents?

Woodstock has a Kin Score of 25.8 out of 100 (emerging) and an Agent Readiness score of 27.3 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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How their score was established

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