Webster Bank

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.

Webster Bank is profiled on the APIs.io network. Tagged areas include Financial-Services, Banking, United States, Commercial Banking, and Super-Regional Bank.

Webster Bank’s developer surface includes engineering blog, documentation, support, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

10.6/100 minimal ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 10.6/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 2.7 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Banking & Open Finance regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/webster-bank: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Webster Bank Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Source (apis.yml)

aid: webster-bank
url: https://raw.githubusercontent.com/api-evangelist/webster-bank/refs/heads/main/apis.yml
name: Webster Bank
kind: company
description: '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.'
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: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - 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
- Commercial Banking
- Super-Regional Bank
- Open Finance
- FDX
- Data Aggregation
- Health Savings Accounts
tags_raw:
- Financial Services
- Banking
- United States
- Commercial Banking
- Super-Regional Bank
- Open Finance
- FDX
- Data Aggregation
- Health Savings Accounts
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.23'
apis: []
common:
- type: Blog
  url: https://www.websterbank.com/private-banking/insights/
- type: DomainSecurity
  url: security/webster-bank-domain-security.yml
- type: Website
  url: https://www.websterbank.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/webster-bank
- type: Documentation
  url: https://www.websterbank.com/commercial-banking/online-access/
- type: Support
  url: https://www.websterbank.com/help
- type: PrivacyPolicy
  url: https://www.websterbank.com/privacy/
- type: TermsOfService
  url: https://www.websterbank.com/legal/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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