# Flagstar

**Canonical:** https://apis.io/providers/flagstar/  
**Website:** https://www.flagstar.com  
**APIs profiled:** 0

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.

## Kin Score — 5.7 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 5.7).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 17.1 |
| Access Clarity | 17.1 |

Regulatory layer — **Banking & Open Finance**: 12.7 (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)

- **Flagstar Domain Security** — TLSv1.2 · HSTS · DNSSEC · DMARC

## Tags

Financial-Services, Banking, United States, National Bank, Super-Regional Bank, Mortgage, Open Finance, Data Aggregation

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