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.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Mr. Cooper Group the way a machine reads it — 14 machine-readable artifacts, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Mr. Cooper Group scores 13.6/100 (minimal), with a separate agent-readiness read of 10/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Mr. Cooper Group
Each block below is one kind of artifact we hold for Mr. Cooper Group. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Features 5
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
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 — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Use Cases 4
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
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 tell you where this provider already fits in a stack.
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
Every other property we hold for Mr. Cooper Group — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
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
← All providers · Data indexed from github.com/api-evangelist/mr-cooper-group · machine-readable index on apis.io