# Western Alliance Bank

**Canonical:** https://apis.io/providers/western-alliance/  
**Website:** https://www.westernalliancebancorporation.com/  
**APIs profiled:** 1

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.

## Kin Score — 27.7 / 100 (thin)

Scored 2026-08-19 under rubric 0.12.0. Trend: flat (+1.5 from 26.2).

| Facet | Score |
|---|---|
| Discoverability | 66.7 |
| Contract Quality | 0.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 52.4 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

Regulatory layer — **Banking & Open Finance**: 39.2 (matched via tags).

## Agent readiness — 8.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (1)

- **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 che...

## Security (2)

- **Western Alliance Authentication** — oauth2/mutualTLS · 3 schemes
- **Western Alliance Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Financial Services, Banking, United States, Treasury Management, Open Banking, Payments, Commercial Banking

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/western-alliance/). Scores are computed from the provider's own public artifacts under a published rubric.