aid: western-alliance
url: https://raw.githubusercontent.com/api-evangelist/western-alliance/refs/heads/main/apis.yml
name: Western Alliance Bank
kind: company
description: >-
  Western Alliance Bancorporation (NYSE: WAL) is a Phoenix, Arizona based
  super-regional bank holding company with roughly $80 billion in assets, operating
  through its principal subsidiary Western Alliance Bank, an Arizona state-chartered
  commercial bank and member FDIC that runs regional divisions including Alliance Bank
  of Arizona, Bank of Nevada, Bridge Bank, and Torrey Pines Bank. It is a commercial-
  and business-banking focused institution rather than a consumer neobank. Western
  Alliance runs a real first-party developer portal, the WAB API Developer Portal
  ("Developer Hub") at developer.westernalliancebank.com, exposing commercial
  Treasury Management open-banking APIs for balance and transaction information,
  check images, funds transfers, and stop payments. Access is partner/customer-gated:
  API specifications are downloaded from the Developer Hub only with WAB-issued
  credentials, and authentication uses OAuth2 client-credentials (Client ID, Client
  Secret), a Client Certificate (mTLS), and access tokens across UAT and Production
  environments. Its APIs are also reachable through payment-platform partners such as
  Modern Treasury. No public consumer FDX or CFPB Section 1033 data-access API is
  documented, and no OpenAPI/Swagger is publicly downloadable.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Financial Services
- Banking
- United States
- Treasury Management
- Open Banking
- Payments
- Commercial Banking
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.19'
apis:
- aid: western-alliance:wab-treasury-management-api
  name: Western Alliance Bank API (Treasury Management)
  description: Western Alliance Bank's commercial open-banking API lets approved business
    clients interact directly with WAB systems to access balance and transaction
    information, retrieve check images, initiate funds transfers, and place stop
    payments. Documented publicly as an open-banking capability; API specifications
    and endpoints are gated behind the WAB Developer Hub and issued credentials.
  humanURL: https://developer.westernalliancebank.com/s/
  tags:
  - Treasury Management
  - Open Banking
  - Payments
  properties:
  - type: Documentation
    url: https://developer.westernalliancebank.com/s/
  - type: Documentation
    url: https://www.westernalliancebancorporation.com/commercial/treasury-management
  - type: TermsOfService
    url: https://www.westernalliancebancorporation.com/sites/default/files/2025-05/api-services-terms-conditions.pdf
common:
- type: DomainSecurity
  url: security/western-alliance-domain-security.yml
- type: Authentication
  url: authentication/western-alliance-authentication.yml
- type: Conformance
  url: conformance/western-alliance-conformance.yml
- type: WellKnown
  url: well-known/western-alliance-well-known.yml
- type: LLMsTxt
  url: llms/western-alliance-llms.txt
- type: Website
  url: https://www.westernalliancebancorporation.com/
- type: DeveloperPortal
  url: https://developer.westernalliancebank.com/s/
- type: Documentation
  url: https://developer.westernalliancebank.com/s/
- type: APIReference
  url: https://developer.westernalliancebank.com/s/apis
- type: GettingStarted
  url: https://developer.westernalliancebank.com/s/getting-started
- type: SignUp
  url: https://developer.westernalliancebank.com/s/login
- type: GitHubOrganization
  url: https://github.com/westernalliancebank
- type: LinkedIn
  url: https://www.linkedin.com/company/western-alliance-bank
- type: PrivacyPolicy
  url: https://www.westernalliancebancorporation.com/privacy-legal-home/privacy-policy
- type: TermsOfService
  url: https://www.westernalliancebancorporation.com/sites/default/files/2025-05/api-services-terms-conditions.pdf
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com