East West Bank website screenshot

East West Bank

East West Bank is the California state-chartered commercial banking subsidiary of East West Bancorp, Inc. (NASDAQ EWBC), headquartered in Pasadena, California, with roughly $79.7 billion in total assets and more than 125 locations across the United States and Greater China. A Member FDIC institution and one of the few U.S. banks holding a full banking license in China, it specializes in cross-border U.S.-China commercial banking, treasury and Global Transaction Services (GTS). On the open-finance front, East West Bank runs a first-party developer portal ("Bridge Open Banking" at apiportal.eastwestbank.com) aimed at commercial clients, documenting APIs to manage sub-accounts, retrieve balances, transfer funds, and obtain commercial account information, with a sandbox of live test accounts; the program is early-stage ("more APIs coming soon") and gated behind sales onboarding, so no OpenAPI/Swagger is publicly downloadable. Consumer-permissioned data access is also available indirectly through the Plaid aggregator. No public FDX participation or CFPB Section 1033 posture is documented as of this profile.

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

East West Bank’s developer surface includes documentation, support, authentication, sandbox, getting-started guide, signup flow, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub
26.6/100 emerging ▬ flat Agent 9/100 agent aware saas Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0
1 APIs
Financial ServicesBankingUnited StatesCommercial BankingTreasury ManagementCross-BorderOpen FinanceData Aggregation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0
Composite quality — 26.6/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 8.5 / 17
Commercial Clarity 5.8 / 17
Operational Transparency 0.6 / 11
Governance 1.3 / 10
Discoverability 5.7 / 9
Regulatory Posture 4.7 / 15
Agent readiness — 9/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
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
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.
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/. This rating is computed from github.com/api-evangelist/east-west-bank: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

East West Bank Bridge Open Banking API

East West Bank's first-party commercial banking API program, delivered through the "Bridge Open Banking" developer portal for Global Transaction Services (GTS) clients. Document...

Security Posture 2

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

East West Bank Authentication

oauth2 · 1 scheme

SECURITY

East West Bank Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Sandbox
Sandbox
 GettingStarted
GettingStarted
 Signup
Signup
 Login
Login

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

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

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Support
Support
 HelpCenter
HelpCenter

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService

Company 2

The organization behind the API

Website
Website
 LinkedIn
LinkedIn

Source (apis.yml)

apis.yml Raw ↑ 
aid: east-west-bank
url: https://raw.githubusercontent.com/api-evangelist/east-west-bank/refs/heads/main/apis.yml
name: East West Bank
kind: company
description: East West Bank is the California state-chartered commercial banking subsidiary of East West Bancorp, Inc. (NASDAQ
  EWBC), headquartered in Pasadena, California, with roughly $79.7 billion in total assets and more than 125 locations across
  the United States and Greater China. A Member FDIC institution and one of the few U.S. banks holding a full banking license
  in China, it specializes in cross-border U.S.-China commercial banking, treasury and Global Transaction Services (GTS).
  On the open-finance front, East West Bank runs a first-party developer portal ("Bridge Open Banking" at apiportal.eastwestbank.com)
  aimed at commercial clients, documenting APIs to manage sub-accounts, retrieve balances, transfer funds, and obtain commercial
  account information, with a sandbox of live test accounts; the program is early-stage ("more APIs coming soon") and gated
  behind sales onboarding, so no OpenAPI/Swagger is publicly downloadable. Consumer-permissioned data access is also available
  indirectly through the Plaid aggregator. No public FDX participation or CFPB Section 1033 posture is documented as of this
  profile.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-11'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Financial Services
- Banking
- United States
- Commercial Banking
- Treasury Management
- Cross-Border
- Open Finance
- Data Aggregation
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.19'
apis:
- aid: east-west-bank:bridge-open-banking-api
  name: East West Bank Bridge Open Banking API
  description: East West Bank's first-party commercial banking API program, delivered through the "Bridge Open Banking" developer
    portal for Global Transaction Services (GTS) clients. Documented capabilities let applications manage sub-accounts, retrieve
    account balances, transfer funds, and securely obtain information on commercial accounts. Developers create an application
    to obtain a single authentication credential and test against a sandbox of live test accounts and test payments. The program
    is early-stage and access is gated behind sales onboarding, so specifications are not publicly downloadable.
  humanURL: https://apiportal.eastwestbank.com/how-it-works
  tags:
  - Accounts
  - Balances
  - Payments
  - Transfers
  properties:
  - type: Documentation
    url: https://apiportal.eastwestbank.com/how-it-works
  - type: APIReference
    url: https://apiportal.eastwestbank.com/apis
  - type: Documentation
    url: https://apiportal.eastwestbank.com/products
common:
- type: DomainSecurity
  url: security/east-west-bank-domain-security.yml
- 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: Support
  url: https://apiportal.eastwestbank.com/support
- type: PrivacyPolicy
  url: https://apiportal.eastwestbank.com/privacy-policy
- type: GitHubOrganization
  url: https://github.com/eastwestbank
- type: LinkedIn
  url: https://www.linkedin.com/company/east-west-bank
- type: Authentication
  url: authentication/east-west-bank-authentication.yml
- type: Sandbox
  url: sandbox/east-west-bank-sandbox.yml
- type: Conformance
  url: conformance/east-west-bank-conformance.yml
- type: LLMsTxt
  url: llms/east-west-bank-llms.txt
- type: GettingStarted
  url: https://apiportal.eastwestbank.com/how-it-works
- 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: HelpCenter
  url: https://apiportal.eastwestbank.com/faqs
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com