Coincheck

Coincheck is a Japanese cryptocurrency exchange. It documents a REST Exchange API (public market data plus HMAC-signed private trading, account, deposit and withdrawal endpoints) and WebSocket market feeds.

Coincheck is listed with 2 APIs on the APIs.io network: Private API and Public API. Tagged areas include Company, Cryptocurrency, Exchange, Trading, and Japan.

The Coincheck catalog on APIs.io includes 1 Spectral governance ruleset.

Coincheck’s developer surface includes documentation and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

15.0/100 emerging ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

2 APIs

Company Cryptocurrency Exchange Trading Japan

Kin Score

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

Composite quality — 15.0/100 · emerging

Contract Quality 2.2 / 19

Developer Ergonomics 1.8 / 15

Access Clarity 1.8 / 15

Operational Transparency 0.0 / 10

Contract Governance 2.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 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 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 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
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)

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 11.6 — up to +22.1 composite points
Developer Ergonomics scores 11.9 — up to +17.6 composite points
Access Clarity scores 11.8 — up to +17.6 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/coincheck/apis.yml: open an issue on github.com/api-evangelist/coincheck 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)	covered	49.8	-	-

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 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 2

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

Coincheck Private API

Authenticated account and trading

Coincheck Public API

Unauthenticated market data

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Coincheck API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Coincheck Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Vocabulary

Vocabulary

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Company 2

The organization behind the API

Newsroom

Newsroom

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: coincheck
name: Coincheck
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: none
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://coincheck.com/images/ogp/coincheck_ogp_large.png
description: Coincheck is a Japanese cryptocurrency exchange. It documents a REST Exchange API (public market data plus HMAC-signed
  private trading, account, deposit and withdrawal endpoints) and WebSocket market feeds.
url: https://raw.githubusercontent.com/api-evangelist/coincheck/refs/heads/main/apis.yml
x-type: company
x-source: harvest:market-gap
x-tier: profiled
x-tier-reason: harvest
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Cryptocurrency
- Exchange
- Trading
- Japan
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/coincheck-rules.yml
- type: Vocabulary
  url: vocabulary/coincheck-vocabulary.yml
- type: Conformance
  url: conformance/coincheck-conformance.yml
- type: Hosts
  url: hosts/coincheck-hosts.yml
- type: Vendors
  url: vendors/coincheck-vendors.yml
- type: SDKs
  url: packages/coincheck-packages.yml
- type: Packages
  url: packages/coincheck-packages.yml
- type: TermsOfService
  url: https://coincheck.com/info/terms
- type: Newsroom
  url: https://corporate.coincheck.com/news
- type: Login
  url: https://coincheck.com/sessions/signin
- type: DomainSecurity
  url: security/coincheck-domain-security.yml
- type: Website
  url: https://coincheck.com
- type: Documentation
  url: https://coincheck.com/documents/exchange/api
apis:
- aid: coincheck:coincheck-private-api
  name: Coincheck Private API
  description: Authenticated account and trading
  humanURL: https://coincheck.com/documents/exchange/api
  baseURL: https://coincheck.com/api
  tags:
  - Private
  properties:
  - type: OpenAPI
    url: openapi/coincheck-private-api-openapi.yml
  - type: Documentation
    url: https://coincheck.com/documents/exchange/api
- aid: coincheck:coincheck-public-api
  name: Coincheck Public API
  description: Unauthenticated market data
  humanURL: https://coincheck.com/documents/exchange/api
  baseURL: https://coincheck.com/api
  tags:
  - Public
  properties:
  - type: OpenAPI
    url: openapi/coincheck-public-api-openapi.yml
  - type: Documentation
    url: https://coincheck.com/documents/exchange/api
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-13'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://assets.coincheck.com/mcp
    status: 403
  - url: https://coincheck.com
    status: 200
x-enrichment:
  status: enriched
  pass: local-v5
  date: '2026-10-13'

Coincheck API — frequently asked questions

Does Coincheck have an API?

Yes. APIs.io lists 2 APIs from Coincheck, including Coincheck Private API and Coincheck Public API.

Is there an OpenAPI specification for the Coincheck API?

Yes. APIs.io indexes 2 OpenAPI specifications for Coincheck, each linked for download from this page.

How do I authenticate with the Coincheck API?

Coincheck uses bearer-token authentication.

Is the Coincheck API ready for AI agents?

Coincheck has a Kin Score of 15.0 out of 100 (emerging) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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