Kyash

Kyash Inc. (株式会社Kyash) is a Tokyo-based fintech founded in 2015 that operates a consumer mobile wallet and Visa prepaid card in Japan, covering charging, peer-to-peer transfers, shared accounts, buy-now-pay-later, personal finance management, and contactless payment through Apple Pay, Google Pay, and Samsung Pay. Kyash is a registered Funds Transfer Service Provider (Kanto Local Finance Bureau No. 00082) and a third-party Prepaid Payment Instrument Issuer (No. 00698), and is ISO/IEC 27001:2022, PCI DSS, and TRUSTe certified. Its business-facing product is Kyash Payout, a mass payout service that sends funds to Japanese domestic bank accounts or Kyash wallets at a flat 50 yen per transfer, integrated either by Zengin/CSV file upload or by direct API integration including a balance API. Kyash previously sold Kyash Direct, an API-based Visa card issuer processing platform launched in 2019. All API access is sales-gated: Kyash publishes no developer portal, API reference, specification, SDK, or sandbox.

Kyash is profiled on the APIs.io network. Tagged areas include Company, Financial Services, Payments, Fintech, and Digital Wallet.

Kyash’s developer surface includes engineering blog, support, pricing, signup flow, product news, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub

25.7/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyFinancial ServicesPaymentsFintechDigital WalletPrepaid CardsMoney TransferPayoutsJapanVisa

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 25.7/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 12.1 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

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

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Compliance

Compliance

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

HelpCenter

StatusPage

ContactUs

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 5

The organization behind the API

Website

Blog

BlogRSS

News

Careers

Other 1

Properties that don't map to a standard resource type

Company

Company

Source (apis.yml)

aid: kyash
name: Kyash
description: 'Kyash Inc. (株式会社Kyash) is a Tokyo-based fintech founded in 2015 that operates a consumer mobile wallet and Visa
  prepaid card in Japan, covering charging, peer-to-peer transfers, shared accounts, buy-now-pay-later, personal finance management,
  and contactless payment through Apple Pay, Google Pay, and Samsung Pay. Kyash is a registered Funds Transfer Service Provider
  (Kanto Local Finance Bureau No. 00082) and a third-party Prepaid Payment Instrument Issuer (No. 00698), and is ISO/IEC 27001:2022,
  PCI DSS, and TRUSTe certified. Its business-facing product is Kyash Payout, a mass payout service that sends funds to Japanese
  domestic bank accounts or Kyash wallets at a flat 50 yen per transfer, integrated either by Zengin/CSV file upload or by
  direct API integration including a balance API. Kyash previously sold Kyash Direct, an API-based Visa card issuer processing
  platform launched in 2019. All API access is sales-gated: Kyash publishes no developer portal, API reference, specification,
  SDK, or sandbox.'
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/5db15c3bca3871afff172c17/5e999e9506f3ea01ffabcdbb_kyash_logo_symbol_blue.png
url: https://raw.githubusercontent.com/api-evangelist/kyash/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- partech
x-tier: profiled
x-tier-reason: enriched-no-public-api-surface
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-25'
tags:
- Company
- Financial Services
- Payments
- Fintech
- Digital Wallet
- Prepaid Cards
- Money Transfer
- Payouts
- Japan
- Visa
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://kyash.co/
- type: Blog
  url: https://blog.kyash.co/
- type: BlogRSS
  url: https://blog.kyash.co/feed
- type: Support
  url: https://help.kyash.co/
- type: HelpCenter
  url: https://help.kyash.co/
- type: GitHubOrganization
  url: https://github.com/Kyash
- type: Pricing
  url: https://kyash.co/biz/payout
- type: SignUp
  url: https://kyash.co/biz/payout/inquiry
- type: TermsOfService
  url: https://kyash.co/legal/terms
- type: PrivacyPolicy
  url: https://kyash.co/legal/policy/privacy
- type: Compliance
  url: https://kyash.co/legal/policy/security
- type: TrustCenter
  url: security/kyash-trust-center.yml
- type: DomainSecurity
  url: security/kyash-domain-security.yml
- type: Lifecycle
  url: lifecycle/kyash-lifecycle.yml
- type: StatusPage
  url: https://kyash.co/news/maintenance
- type: Packages
  url: packages/kyash-packages.yml
- type: LLMsTxt
  url: llms/kyash-llms.txt
- type: News
  url: https://kyash.co/news/press-release
- type: Company
  url: https://kyash.co/company
- type: Careers
  url: https://kyash.co/recruit
- type: ContactUs
  url: https://kyash.co/contact
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence