Western Alliance Bank

Western Alliance Bank API (Treasury Management)

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.

GitHub

Documentation

📖
Documentation
https://developer.westernalliancebank.com/s/
📖
Documentation
https://www.westernalliancebancorporation.com/commercial/treasury-management

Other Resources

🔗
TermsOfService
https://www.westernalliancebancorporation.com/sites/default/files/2025-05/api-services-terms-conditions.pdf
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/western-alliance/refs/heads/main/apis.yml

API entry from apis.yml

apis.yml Raw ↑ 
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