East West Bancorp

East West Bancorp, Inc. (NASDAQ: EWBC) is the Pasadena, California bank holding company for East West Bank, a California state-chartered commercial bank and Member FDIC institution (NMLSR ID 469761) that specializes in cross-border U.S.-Greater China commercial banking and Global Transaction Services. The holding company publishes no API of its own; the group's entire developer surface is East West Bank's first-party "Bridge Open Banking" program at apiportal.eastwestbank.com, which documents APIs to open and manage master and sub accounts (with ACH transaction permissions and Excess, Deficit or TwoWay sweeps), retrieve balances, transactions and statements, transfer funds, and receive incoming and outgoing wire push notifications. Authorization is OAuth 2.0 client_credentials against an Okta token endpoint with a Bearer token, account-opening and funds-transfer requests are made idempotent by a client-generated GUID requestId, and a client certificate is required for sandbox and production connectivity. Portal sign-up is free and self-serve, but the API list, product library and every callable environment sit behind sign-in and Global Transaction Services sales onboarding, so no OpenAPI, Swagger or AsyncAPI document is publicly downloadable.

East West Bancorp publishes 1 API on the APIs.io network. Tagged areas include Banking, Financial Services, Commercial Banking, Treasury Management, and Open Banking.

The East West Bancorp catalog on APIs.io includes 1 event-driven AsyncAPI specification.

East West Bancorp’s developer surface includes signup flow, documentation, API reference, getting-started guide, support, engineering blog, release notes, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

44.5/100 developing ▬ flat Agent 26/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessPaid

1 APIs

Banking Financial Services Commercial Banking Treasury Management Open Banking Payments Cross-Border United States

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 44.5/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 7.2 / 17

Operational Transparency 2.9 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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

Regulatory Posture applies to this provider. Its tags matched the Banking & Open Finance 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/.

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 github.com/api-evangelist/east-west-bancorp: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

East West Bank Bridge Open Banking API

East West Bancorp's API surface is delivered by its banking subsidiary, East West Bank, through the Bridge Open Banking developer program for Global Transaction Services clients...

Pricing Plans 1

Published pricing tiers and plan structures.

East West Bancorp Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

East West Bancorp Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

East West Bancorp Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

East West Bancorp Webhooks

ASYNCAPI

Security Posture 2

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

East West Bancorp Authentication

oauth2 · 1 scheme

SECURITY

East West Bancorp Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 6

Portal, sign-up, and the first successful call

Signup

DeveloperPortal

GettingStarted

SignUp

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Conformance

Lifecycle

Webhooks

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 5

Status, limits, changes, and where to get help

Support

HelpCenter

ReleaseNotes

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

Plans

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: east-west-bancorp
url: https://raw.githubusercontent.com/api-evangelist/east-west-bancorp/refs/heads/main/apis.yml
name: East West Bancorp
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/east-west-bancorp.png
tags:
- Banking
- Financial Services
- Commercial Banking
- Treasury Management
- Open Banking
- Payments
- Cross-Border
- United States
tags_raw:
- Banking
- Financial Services
- Commercial Banking
- Treasury Management
- Open Banking
- Payments
- Cross-Border
- United States
- Financial-Services
description: 'East West Bancorp, Inc. (NASDAQ: EWBC) is the Pasadena, California bank holding company for East West Bank,
  a California state-chartered commercial bank and Member FDIC institution (NMLSR ID 469761) that specializes in cross-border
  U.S.-Greater China commercial banking and Global Transaction Services. The holding company publishes no API of its own;
  the group''s entire developer surface is East West Bank''s first-party "Bridge Open Banking" program at apiportal.eastwestbank.com,
  which documents APIs to open and manage master and sub accounts (with ACH transaction permissions and Excess, Deficit or
  TwoWay sweeps), retrieve balances, transactions and statements, transfer funds, and receive incoming and outgoing wire push
  notifications. Authorization is OAuth 2.0 client_credentials against an Okta token endpoint with a Bearer token, account-opening
  and funds-transfer requests are made idempotent by a client-generated GUID requestId, and a client certificate is required
  for sandbox and production connectivity. Portal sign-up is free and self-serve, but the API list, product library and every
  callable environment sit behind sign-in and Global Transaction Services sales onboarding, so no OpenAPI, Swagger or AsyncAPI
  document is publicly downloadable.'
created: '2026-04-19'
modified: '2026-09-14'
specificationVersion: '0.23'
apis:
- aid: east-west-bancorp:east-west-bancorp-api
  name: East West Bank Bridge Open Banking API
  tags:
  - Banking
  - Financial Services
  - Account
  - Balances
  - Payments
  - Transfers
  tags_raw:
  - Banking
  - Financial Services
  - Accounts
  - Balances
  - Payments
  - Transfers
  - Financial-Services
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://api.eastwestbank.com
  humanURL: https://apiportal.eastwestbank.com/
  properties:
  - url: https://apiportal.eastwestbank.com/how-it-works
    type: Documentation
  - url: https://apiportal.eastwestbank.com/apis
    type: APIReference
  - url: https://apiportal.eastwestbank.com/AuthorizationAPI
    type: Authentication
  - url: https://apiportal.eastwestbank.com/faqs
    type: HelpCenter
  description: East West Bancorp's API surface is delivered by its banking subsidiary, East West Bank, through the Bridge
    Open Banking developer program for Global Transaction Services clients. Documented capabilities open and manage master
    and sub accounts — including an aCHTransactionsAllowed permission, Excess, Deficit and TwoWay sweeps and a pegBalance
    — retrieve account, transaction and statement information, transfer funds, and deliver incoming and outgoing wire push
    notifications carrying originator, sending and beneficiary country codes. Authorization is two-legged OAuth 2.0 (client_credentials)
    against an Okta token endpoint, returning a Bearer token; account opening and funds transfer take a client-generated GUID
    requestId that makes them safely replayable. The gateway is an Azure API Management runtime on East West Bank's own infrastructure.
    The API list, product library and reference render only after portal sign-in, and sandbox and production require a client
    certificate plus a GTS sales conversation, so no machine-readable contract is publicly downloadable.
common:
- type: Signup
  url: https://apiportal.eastwestbank.com/signup
- type: DomainSecurity
  url: security/east-west-bancorp-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/east-west-bank
- type: Website
  url: https://www.eastwestbank.com
- type: DeveloperPortal
  url: https://apiportal.eastwestbank.com/
- type: Documentation
  url: https://apiportal.eastwestbank.com/how-it-works
- type: APIReference
  url: https://apiportal.eastwestbank.com/apis
- type: GettingStarted
  url: https://apiportal.eastwestbank.com/how-it-works
- type: Support
  url: https://apiportal.eastwestbank.com/support
- type: HelpCenter
  url: https://apiportal.eastwestbank.com/faqs
- type: SignUp
  url: https://apiportal.eastwestbank.com/signup
- type: Login
  url: https://apiportal.eastwestbank.com/signin
- type: TermsOfService
  url: https://apiportal.eastwestbank.com/terms-and-conditions
- type: PrivacyPolicy
  url: https://apiportal.eastwestbank.com/privacy-policy
- type: Blog
  url: https://www.eastwestbank.com/ReachFurther
- type: GitHubOrganization
  url: https://github.com/EastWestBank
- type: ReleaseNotes
  url: https://apiportal.eastwestbank.com/release-notes
- type: ChangeLog
  url: changelog/east-west-bancorp-changelog.yml
- type: Authentication
  url: authentication/east-west-bancorp-authentication.yml
- type: Conventions
  url: conventions/east-west-bancorp-conventions.yml
- type: Idempotency
  url: conventions/east-west-bancorp-conventions.yml
- type: Conformance
  url: conformance/east-west-bancorp-conformance.yml
- type: Sandbox
  url: sandbox/east-west-bancorp-sandbox.yml
- type: Lifecycle
  url: lifecycle/east-west-bancorp-lifecycle.yml
- type: Webhooks
  url: asyncapi/east-west-bancorp-webhooks.yml
- type: LLMsTxt
  url: llms/east-west-bancorp-llms.txt
- type: Packages
  url: packages/east-west-bancorp-packages.yml
- type: Plans
  url: plans/east-west-bancorp-plans-pricing.yml
- type: RateLimits
  url: rate-limits/east-west-bancorp-rate-limits.yml
- type: FinOps
  url: finops/east-west-bancorp-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-09-14'
  status: enriched
  artifacts_added: 10
  pass: local-v3

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