Flagstar

Flagstar Bank, N.A. is the OCC-chartered national bank subsidiary of Flagstar Financial, Inc. (NYSE: FLG), the Hicksville, New York holding company formerly known as New York Community Bancorp (NYCB). It is one of the largest regional (super-regional) banks in the United States, formed when NYCB acquired Flagstar Bancorp in December 2022, converted Flagstar Bank, FSB into a national bank (Flagstar Bank, N.A.), and subsequently acquired certain assets and liabilities of Signature Bridge Bank from the FDIC in March 2023; the holding company rebranded to Flagstar Financial in October 2024. Flagstar operates in retail and commercial banking, mortgage origination and servicing, and warehouse lending. On the API front, Flagstar runs a first-party developer portal at developer.flagstar.com (a Broadcom/Layer7 "LivePortal" API Developer Portal), but as of this review it publishes no public, self-serve API products, API documentation, or downloadable OpenAPI/Swagger to anonymous visitors — all products are sign-in gated behind partner/consumer-team access. Flagstar has no publicly documented FDX (Financial Data Exchange) participation or CFPB Section 1033 data-access posture; consumer-permissioned data sharing appears to be available only through third-party aggregators (e.g. Plaid, Tink, TrueLayer) rather than a first-party public API.

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

🌐 Visit website 📡 Source on GitHub

5.7/100 minimal ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Financial-ServicesBankingUnited StatesNational BankSuper-Regional BankMortgageOpen FinanceData Aggregation

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 5.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 2.9 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 1.9 / 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

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.

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/. This rating is computed from github.com/api-evangelist/flagstar: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 2

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

LinkedIn

Source (apis.yml)

aid: flagstar
url: https://raw.githubusercontent.com/api-evangelist/flagstar/refs/heads/main/apis.yml
name: Flagstar
kind: company
description: 'Flagstar Bank, N.A. is the OCC-chartered national bank subsidiary of Flagstar Financial, Inc. (NYSE: FLG), the
  Hicksville, New York holding company formerly known as New York Community Bancorp (NYCB). It is one of the largest regional
  (super-regional) banks in the United States, formed when NYCB acquired Flagstar Bancorp in December 2022, converted Flagstar
  Bank, FSB into a national bank (Flagstar Bank, N.A.), and subsequently acquired certain assets and liabilities of Signature
  Bridge Bank from the FDIC in March 2023; the holding company rebranded to Flagstar Financial in October 2024. Flagstar operates
  in retail and commercial banking, mortgage origination and servicing, and warehouse lending. On the API front, Flagstar
  runs a first-party developer portal at developer.flagstar.com (a Broadcom/Layer7 "LivePortal" API Developer Portal), but
  as of this review it publishes no public, self-serve API products, API documentation, or downloadable OpenAPI/Swagger to
  anonymous visitors — all products are sign-in gated behind partner/consumer-team access. Flagstar has no publicly documented
  FDX (Financial Data Exchange) participation or CFPB Section 1033 data-access posture; consumer-permissioned data sharing
  appears to be available only through third-party aggregators (e.g. Plaid, Tink, TrueLayer) rather than a first-party public
  API.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-11'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Financial-Services
- Banking
- United States
- National Bank
- Super-Regional Bank
- Mortgage
- Open Finance
- Data Aggregation
tags_raw:
- Financial Services
- Banking
- United States
- National Bank
- Super-Regional Bank
- Mortgage
- Open Finance
- Data Aggregation
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.23'
apis: []
common:
- type: Login
  url: https://roc.flagstar.com/comp/login.jsp
- type: DomainSecurity
  url: security/flagstar-domain-security.yml
- type: Website
  url: https://www.flagstar.com
- type: DeveloperPortal
  url: https://developer.flagstar.com
- type: LinkedIn
  url: https://www.linkedin.com/company/flagstar-bank
- type: PrivacyPolicy
  url: https://www.flagstar.com/legal-disclaimers/privacy.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com