Western Alliance Bank · Authentication Profile

Western Alliance Authentication

Authentication

Western Alliance Bank secures its APIs with oauth2 and mutualTLS across 3 declared security schemes, as derived from its OpenAPI definitions. OAuth 2.0 is offered via the clientCredentials flow(s).

Financial-ServicesBankingUnited StatesTreasury ManagementOpen BankingPaymentsCommercial Banking
Methods: oauth2, mutualTLS Schemes: 3 OAuth flows: clientCredentials API key in:

Security Schemes

TreasuryManagementOAuth2 oauth2
TreasuryManagementClientCertificate mutualTLS
DeveloperHubPortalOIDC openIdConnect

Source

Authentication Profile

western-alliance-authentication.yml Raw ↑ 
generated: '2026-07-23'
method: searched
source: >-
  API Services Terms & Conditions (https://www.westernalliancebancorporation.com/sites/default/files/2025-05/api-services-terms-conditions.pdf)
  + /.well-known/openid-configuration on the WAB Developer Hub
docs: https://developer.westernalliancebank.com/s/
note: >-
  No public OpenAPI is downloadable (the Treasury Management API spec is
  credential-gated behind the WAB Developer Hub), so this profile is derived from
  the provider's published API Services Terms & Conditions and the anonymously
  served OIDC discovery document — not from a harvested securitySchemes block.
summary:
  types: [oauth2, mutualTLS]
  oauth2_flows: [clientCredentials]
  mtls: true
  environments: [UAT, Production]
schemes:
- name: TreasuryManagementOAuth2
  type: oauth2
  applies_to: Western Alliance Bank Treasury Management open-banking API
  flow: clientCredentials
  credentials:
  - Client ID
  - Client Secret
  - access Token (issued by the API gateway)
  evidence: >-
    API Services Terms & Conditions define "API Authentication Credentials" as
    Client ID + Client Secret + Client Certificate + Token, i.e. OAuth2
    client-credentials with a token issued per environment (UAT / Production).
- name: TreasuryManagementClientCertificate
  type: mutualTLS
  applies_to: Western Alliance Bank Treasury Management open-banking API
  evidence: >-
    A Client Certificate (mutual TLS) is a required component of the API
    Authentication Credentials alongside the OAuth2 client-credentials pair.
- name: DeveloperHubPortalOIDC
  type: openIdConnect
  applies_to: WAB Developer Hub portal login (Salesforce Experience Cloud IdP) — not the business API
  issuer: https://developer.westernalliancebank.com
  authorization_endpoint: https://developer.westernalliancebank.com/services/oauth2/authorize
  token_endpoint: https://developer.westernalliancebank.com/services/oauth2/token
  introspection_endpoint: https://developer.westernalliancebank.com/services/oauth2/introspect
  revocation_endpoint: https://developer.westernalliancebank.com/services/oauth2/revoke
  jwks_uri: https://developer.westernalliancebank.com/id/keys
  token_endpoint_auth_methods_supported: [client_secret_post, client_secret_basic, private_key_jwt]
  id_token_signing_alg_values_supported: [RS256]
  source: well-known/western-alliance-openid-configuration.json
  evidence: /.well-known/openid-configuration returns 200 anonymously.

Work with this as data

Every security artifact here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for security posture

4 MCP tools reach this
  • find_securityBrowse and filter every security artifact in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This security artifact 
curl "https://apis.io/api/v1/security/western-alliance-authentication"
All security posture 
curl "https://apis.io/api/v1/security?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.