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

12.3/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

Financial ServicesBankingUnited StatesNational BankSuper-Regional BankMortgageOpen FinanceData Aggregation

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 12.3/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.7 / 20

Commercial Clarity 2.1 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

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 1

Portal, sign-up, and the first successful call

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.'
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
created: '2026-07-23'
modified: '2026-07-23'
specificationVersion: '0.19'
apis: []
common:
- 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