# Webster Bank

**Canonical:** https://apis.io/providers/webster-bank/  
**Website:** https://www.websterbank.com/  
**APIs profiled:** 0

Webster Bank, N.A. is a nationally chartered commercial bank (National Association) and the principal banking subsidiary of Webster Financial Corporation (NYSE: WBS), a Delaware-incorporated bank and financial holding company headquartered in Stamford, Connecticut. A values-based super-regional institution with roughly $84 billion in assets, Webster serves businesses, individuals, and families across the Northeast from the New York City metro area through Connecticut, Rhode Island, and Massachusetts, and operates the HSA Bank division, a leading national provider of health savings accounts and consumer-directed benefit administration in all 50 states. Webster does not publish a first-party public developer portal or downloadable API specifications. Its open-finance posture is consumer- and commercial-permissioned data sharing delivered through aggregators rather than a direct API: in June 2026 Webster went live on Prolific Banking's FI-Streams Connector using Plaid's FDX-aligned Core Exchange specification to give commercial clients secure, tokenized connectivity to the Plaid network, and consumer account data is also reachable via Plaid and Finicity. There is no publicly documented first-party REST API, OpenAPI/Swagger definition, or self-serve developer program.

## Kin Score — 10.6 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 10.6).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

Regulatory layer — **Banking & Open Finance**: 17.7 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| 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 |

## Security (1)

- **Webster Bank Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Financial-Services, Banking, United States, Commercial Banking, Super-Regional Bank, Open Finance, FDX, Data Aggregation, Health Savings Accounts

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