Western Alliance Bank

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.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-02'
  method: derived
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
tags_raw:
- Financial Services
- Banking
- United States
- Treasury Management
- Open Banking
- Payments
- Commercial Banking
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.23'
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: Blog
  url: https://www.westernalliancebancorporation.com/insights
- 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