bitFlyer

bitFlyer is a Japanese cryptocurrency exchange. Its bitFlyer Lightning trading platform exposes a public and private HTTP API at api.bitflyer.com for market data, account assets, deposits and withdrawals, and order placement.

bitFlyer is listed with 6 APIs on the APIs.io network, including Account API, Assets API, Chat API, and 3 more. Tagged areas include Company, Cryptocurrency, Exchange, Trading, and Japan.

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

bitFlyer’s developer surface includes documentation, authentication, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

18.3/100 emerging ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

6 APIs

Company Cryptocurrency Exchange Trading Japan

Kin Score

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

Composite quality — 18.3/100 · emerging

Contract Quality 2.5 / 19

Developer Ergonomics 2.5 / 15

Access Clarity 0.0 / 15

Operational Transparency 3.1 / 10

Contract Governance 1.6 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · 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 8 / 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 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/bitflyer/"><img src="https://apis.io/badge/bitflyer/card.svg" alt="bitFlyer on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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)
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

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 13.4 — up to +21.7 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 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/bitflyer/apis.yml: open an issue on github.com/api-evangelist/bitflyer 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	52.9	-	-
France Authorised Financial Firms (ACPR REGAFI + AMF white list)	covered	52.9	-	-

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 6

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

bitFlyer Account API

The Account API from bitFlyer — 1 operation(s) for account.

bitFlyer Assets API

The Assets API from bitFlyer — 3 operation(s) for assets.

bitFlyer Chat API

The Chat API from bitFlyer — 1 operation(s) for chat.

bitFlyer Deposits and Withdrawals API

The Deposits and Withdrawals API from bitFlyer — 7 operation(s) for deposits and withdrawals.

bitFlyer Markets API

The Markets API from bitFlyer — 9 operation(s) for markets.

bitFlyer Trading API

The Trading API from bitFlyer — 13 operation(s) for trading.

bitFlyer API pricing

Rate limits

Same IP address: 5 minutes
Private APIs: 5 minutes
Order placement (sendchildorder, sendparentorder, cancelallchildorders combined): 5 minutes

Rate-limit details →

Rate Limits 1

Documented rate limits and quota policies.

Bitflyer Rate Limits

3 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

bitFlyer API Rules

15 rules · 13 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Bitflyer Authentication

1 scheme

SECURITY

Bitflyer Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: bitflyer
name: bitFlyer
description: bitFlyer is a Japanese cryptocurrency exchange. Its bitFlyer Lightning trading platform exposes a public and
  private HTTP API at api.bitflyer.com for market data, account assets, deposits and withdrawals, and order placement.
url: https://raw.githubusercontent.com/api-evangelist/bitflyer/refs/heads/main/apis.yml
x-type: company
x-source: harvest:market-gap
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-13 (local-v5; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
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/bitflyer-rules.yml
- type: ErrorCatalog
  url: errors/bitflyer-problem-types.yml
- type: Conformance
  url: conformance/bitflyer-conformance.yml
- type: Hosts
  url: hosts/bitflyer-hosts.yml
- type: Vendors
  url: vendors/bitflyer-vendors.yml
- type: DomainSecurity
  url: security/bitflyer-domain-security.yml
- type: Website
  url: https://bitflyer.com
- type: Documentation
  url: https://lightning.bitflyer.com/docs?lang=en
- type: RateLimits
  url: rate-limits/bitflyer-rate-limits.yml
- type: Authentication
  url: authentication/bitflyer-authentication.yml
apis:
- aid: bitflyer:bitflyer-account-api
  name: bitFlyer Account API
  description: The Account API from bitFlyer — 1 operation(s) for account.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-account-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
- aid: bitflyer:bitflyer-assets-api
  name: bitFlyer Assets API
  description: The Assets API from bitFlyer — 3 operation(s) for assets.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-assets-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
- aid: bitflyer:bitflyer-chat-api
  name: bitFlyer Chat API
  description: The Chat API from bitFlyer — 1 operation(s) for chat.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Chat
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-chat-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
- aid: bitflyer:bitflyer-deposits-and-withdrawals-api
  name: bitFlyer Deposits and Withdrawals API
  description: The Deposits and Withdrawals API from bitFlyer — 7 operation(s) for deposits and withdrawals.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Deposits and Withdrawals
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-deposits-and-withdrawals-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
- aid: bitflyer:bitflyer-markets-api
  name: bitFlyer Markets API
  description: The Markets API from bitFlyer — 9 operation(s) for markets.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Markets
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-markets-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
- aid: bitflyer:bitflyer-trading-api
  name: bitFlyer Trading API
  description: The Trading API from bitFlyer — 13 operation(s) for trading.
  humanURL: https://lightning.bitflyer.com/docs?lang=en
  baseURL: https://api.bitflyer.com/v1
  tags:
  - Trading
  properties:
  - type: OpenAPI
    url: openapi/bitflyer-trading-api-openapi.yml
  - type: Documentation
    url: https://lightning.bitflyer.com/docs?lang=en
  - type: APIPlayground
    url: https://lightning.bitflyer.com/docs/playground?lang=en
x-enrichment:
  status: enriched
  pass: local-v5
  date: '2026-10-13'
  artifacts_added: 4

bitFlyer API — frequently asked questions

Does bitFlyer have an API?

Yes. APIs.io lists 6 APIs from bitFlyer, including bitFlyer Account API, bitFlyer Assets API and bitFlyer Chat API, and 3 more.

Is there an OpenAPI specification for the bitFlyer API?

Yes. APIs.io indexes 6 OpenAPI specifications for bitFlyer, each linked for download from this page.

How do I authenticate with the bitFlyer API?

bitFlyer uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Bitflyer Authentication.

Is the bitFlyer API ready for AI agents?

bitFlyer has a Kin Score of 18.3 out of 100 (emerging) and an Agent Readiness score of 22.1 (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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/bitflyer"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/bitflyer/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/bitflyer/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.