Mr. Cooper Group

Mr. Cooper Group (formerly Nationstar Mortgage, NASDAQ: COOP) was a Coppell, Texas-based mortgage servicer with roughly $1.5T in unpaid principal balance under servicing and more than 4 million customers. It was acquired by Rocket Companies (NYSE: RKT) in an all-stock transaction announced March 31, 2025 (initial value $9.4B) and closed October 1, 2025 (final value approximately $14.2B). Mr. Cooper now operates as a Rocket Companies subsidiary; the corporate site mrcoopergroup.com redirects to rocketcompanies.com and the COOP ticker has been delisted. The consumer brand Mr. Cooper continues at mrcooper.com as one of seven Rocket Companies operating businesses (Rocket Mortgage, Redfin, Mr. Cooper, Rocket Homes, Rocket Close, Rocket Money, Rocket Loans). Mr. Cooper does not publish a public developer API or developer portal.

Mr. Cooper Group is profiled on the APIs.io network. Tagged areas include Mortgage, Mortgage Servicing, Financial Services, Real Estate, and Consumer Finance.

Mr. Cooper Group’s developer surface includes engineering blog, authentication, and 5 more developer resources.

13.6/100 minimal ▬ flat Agent 10/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs 5 Features 4 Use Cases
MortgageMortgage ServicingFinancial ServicesReal EstateConsumer FinanceAcquiredRocket Companies

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 13.6/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 2.6 / 20
Commercial Clarity 4.2 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 10/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 10 / 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/mr-cooper-group: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Features 5

Notable capabilities this provider offers.

Mortgage Servicing

Servicing of residential mortgage loans for approximately 4.3 million customers across the United States, covering payment processing, escrow, customer service, and loss mitigat...

Mortgage Origination

Origination of home purchase, refinance, cash-out refinance, and home equity loans, now powered by Rocket Mortgage following the acquisition.

Home Equity Loans

Second-lien home equity products allowing customers to access equity 'without losing the rate on your first mortgage'.

Online Self-Service

Mr. Cooper consumer portal at mrcooper.com providing account access, payment, statements, escrow management, and loan lookup.

Mobile App

Mr. Cooper mobile app for iOS and Android offering account management, payments, and document access.

Security Posture 1

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

Mr Cooper Group Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Use Cases 4

What developers build with this provider.

Residential Mortgage Servicing

Servicing third-party-originated and GSE-owned residential mortgages at scale, including conforming, FHA, VA, and USDA loans.

Mortgage Subservicing

Subservicing arrangements for banks, credit unions, and mortgage investors that own loans but outsource servicing operations.

Specialty Servicing

Servicing of delinquent, non-performing, and re-performing loans through the Rushmore Servicing subsidiary.

Real Estate Services

REO management, valuation, title, and field services historically delivered through the Xome subsidiary.

Integrations 4

Pre-built integrations with other platforms and tools.

Rocket Mortgage

Mr. Cooper consumer mortgage originations are now branded 'Homeownership Powered by Rocket Mortgage' following the acquisition; mrcooper.com explicitly notes the two are 'separa...

Fannie Mae

GSE counterparty for conforming loan servicing, securitization, and subservicing.

Freddie Mac

GSE counterparty for conforming loan servicing and subservicing.

Ginnie Mae

Issuer relationship for FHA, VA, and USDA-backed mortgage-backed securities.

Resources

Get Started 1

Portal, sign-up, and the first successful call

Access & Security 3

Authentication, authorization, and security posture

Company 5

The organization behind the API

Other 3

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: mr-cooper-group
url: https://raw.githubusercontent.com/api-evangelist/mr-cooper-group/refs/heads/main/apis.yml
name: Mr. Cooper Group
type: Index
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mr-cooper-group.png
tags:
- Mortgage
- Mortgage Servicing
- Financial Services
- Real Estate
- Consumer Finance
- Acquired
- Rocket Companies
description: 'Mr. Cooper Group (formerly Nationstar Mortgage, NASDAQ: COOP) was a Coppell, Texas-based mortgage servicer with
  roughly $1.5T in unpaid principal balance under servicing and more than 4 million customers. It was acquired by Rocket Companies
  (NYSE: RKT) in an all-stock transaction announced March 31, 2025 (initial value $9.4B) and closed October 1, 2025 (final
  value approximately $14.2B). Mr. Cooper now operates as a Rocket Companies subsidiary; the corporate site mrcoopergroup.com
  redirects to rocketcompanies.com and the COOP ticker has been delisted. The consumer brand Mr. Cooper continues at mrcooper.com
  as one of seven Rocket Companies operating businesses (Rocket Mortgage, Redfin, Mr. Cooper, Rocket Homes, Rocket Close,
  Rocket Money, Rocket Loans). Mr. Cooper does not publish a public developer API or developer portal.'
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.19'
apis: []
common:
- type: DomainSecurity
  url: security/mr-cooper-group-domain-security.yml
- url: https://www.mrcooper.com/blog/feed/
  type: Blog
- type: Website
  url: https://www.mrcooper.com/
- type: ParentCompanyWebsite
  url: https://www.rocketcompanies.com/
- type: InvestorRelations
  url: https://ir.rocketcompanies.com/home/default.aspx
- type: LinkedIn
  url: https://www.linkedin.com/company/mrcooper/
- type: Login
  url: https://www.mrcooper.com/login
- type: Features
  data:
  - name: Mortgage Servicing
    description: Servicing of residential mortgage loans for approximately 4.3 million customers across the United States,
      covering payment processing, escrow, customer service, and loss mitigation.
  - name: Mortgage Origination
    description: Origination of home purchase, refinance, cash-out refinance, and home equity loans, now powered by Rocket
      Mortgage following the acquisition.
  - name: Home Equity Loans
    description: Second-lien home equity products allowing customers to access equity 'without losing the rate on your first
      mortgage'.
  - name: Online Self-Service
    description: Mr. Cooper consumer portal at mrcooper.com providing account access, payment, statements, escrow management,
      and loan lookup.
  - name: Mobile App
    description: Mr. Cooper mobile app for iOS and Android offering account management, payments, and document access.
- type: UseCases
  data:
  - name: Residential Mortgage Servicing
    description: Servicing third-party-originated and GSE-owned residential mortgages at scale, including conforming, FHA,
      VA, and USDA loans.
  - name: Mortgage Subservicing
    description: Subservicing arrangements for banks, credit unions, and mortgage investors that own loans but outsource servicing
      operations.
  - name: Specialty Servicing
    description: Servicing of delinquent, non-performing, and re-performing loans through the Rushmore Servicing subsidiary.
  - name: Real Estate Services
    description: REO management, valuation, title, and field services historically delivered through the Xome subsidiary.
- type: Authentication
  data:
  - name: No Public API
    description: Mr. Cooper does not publish a public developer API, developer portal, OpenAPI specification, or SDK. Consumer-facing
      mobile and web experiences are powered by private internal APIs not exposed to third parties.
- type: Compliance
  data:
  - name: CFPB Regulation
    description: Subject to U.S. Consumer Financial Protection Bureau supervision and enforcement as a large mortgage servicer.
  - name: RESPA
    description: Real Estate Settlement Procedures Act compliance governing mortgage servicing disclosures, escrow accounts,
      and loss mitigation.
  - name: TILA
    description: Truth in Lending Act compliance for periodic statements, ARM disclosures, and payoff statements.
  - name: GLBA
    description: Gramm-Leach-Bliley Act compliance for safeguarding customer financial information.
  - name: State Servicing Licenses
    description: Licensed mortgage servicer across U.S. states with applicable state regulatory oversight.
- type: Acquisition
  data:
  - name: Acquired By Rocket Companies
    description: 'Acquisition by Rocket Companies (NYSE: RKT) announced March 31, 2025 in an all-stock transaction initially
      valued at $9.4 billion, with a fixed exchange ratio of 11.0 Rocket Class A shares per Mr. Cooper share.'
  - name: Deal Closing
    description: Transaction closed October 1, 2025 at a final value of approximately $14.2 billion driven by RKT share-price
      appreciation between announcement and close. Mr. Cooper became a wholly-owned Rocket Companies subsidiary on the closing
      date.
  - name: NASDAQ Delisting
    description: COOP common stock ceased trading on Nasdaq on closing. The mrcoopergroup.com corporate domain now redirects
      to rocketcompanies.com and Mr. Cooper investor relations consolidated under ir.rocketcompanies.com.
  - name: Combined Servicing Scale
    description: The combined Rocket Companies + Mr. Cooper platform is the largest U.S. mortgage servicer, with the Rocket
      investor narrative referencing approximately $2.1T in combined servicing UPB across more than 10 million clients post-close.
- type: Subsidiaries
  data:
  - name: Nationstar Mortgage LLC
    description: Operating mortgage servicing and origination subsidiary doing business as Mr. Cooper. The legal entity name
      predates the 2017 consumer rebrand to Mr. Cooper.
  - name: Xome
    description: Real estate technology subsidiary providing REO disposition, valuations, title, and field services. Mr. Cooper
      announced sale of the Xome auction business to Voxtur in 2024.
  - name: Rushmore Servicing
    description: Specialty servicing subsidiary focused on non-performing and re-performing residential mortgages.
- type: Integrations
  data:
  - name: Rocket Mortgage
    description: Mr. Cooper consumer mortgage originations are now branded 'Homeownership Powered by Rocket Mortgage' following
      the acquisition; mrcooper.com explicitly notes the two are 'separate companies uniting under the same parent organization'.
  - name: Fannie Mae
    description: GSE counterparty for conforming loan servicing, securitization, and subservicing.
  - name: Freddie Mac
    description: GSE counterparty for conforming loan servicing and subservicing.
  - name: Ginnie Mae
    description: Issuer relationship for FHA, VA, and USDA-backed mortgage-backed securities.
- type: History
  data:
  - name: Founding
    description: Traces origins to 1997 with the founding of Nationstar Mortgage; corporate predecessor entities trace to
      WMI Holdings (the post-bankruptcy successor to Washington Mutual). Current Mr. Cooper Group corporate structure formed
      in 2018.
  - name: Brand Change
    description: Rebranded consumer-facing operations from Nationstar Mortgage to Mr. Cooper in August 2017; the parent renamed
      from Nationstar Mortgage Holdings to Mr. Cooper Group Inc. in 2018.
  - name: 2023 Cyberattack
    description: Suffered a cyberattack on October 31, 2023 that compromised personal information of millions of current and
      former customers and temporarily took servicing systems offline.
  - name: Headquarters
    description: Coppell, Texas (Dallas-Fort Worth area).
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com