Fannie Mae

Fannie Mae, officially known as the Federal National Mortgage Association, is a government-sponsored enterprise that plays a critical role in the American housing market. Established in 1938, Fannie Mae operates as a secondary mortgage lender, purchasing mortgages from banks and other financial institutions. By buying these loans, Fannie Mae helps to provide liquidity to the mortgage market, enabling banks to lend more money to homebuyers. Fannie Mae operates a developer portal that hosts API integrations for mortgage industry partners; access typically requires authenticated business relationships.

Fannie Mae is profiled on the APIs.io network. Tagged areas include Housing, Mortgage, Finance, Government-Sponsored Enterprise, and Fortune 100.

Fannie Mae’s developer surface includes product news, engineering blog, documentation, getting-started guide, support, signup flow, authentication, and 25 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.8/100 thin ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

0 APIs

Housing Mortgage Finance Government-Sponsored Enterprise Fortune 100

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 32.8/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 7.1 / 17

Access Clarity 5.8 / 17

Operational Transparency 4.9 / 11

Contract Governance 1.9 / 10

Discoverability 4.8 / 9

Regulatory Posture 6.0 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector 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.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 34.2 — up to +13.2 composite points
Developer Ergonomics scores 41.7 — up to +11.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/fannie-mae/apis.yml: open an issue on github.com/api-evangelist/fannie-mae to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Consumer Lending Licensing (UK, US, Canada credit licence registers)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Dynamic Client Registration

measured — observed by APIs.io (published)

Fannie Mae API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Fannie Mae Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fannie Mae Rate Limits

0 limits

RATE LIMITS

Security Posture 3

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

Fannie Mae Authentication

4 schemes

SECURITY

Fannie Mae Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Fannie Mae Vulnerability Disclosure

Hackerone

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Fannie Mae Scopes

15 scopes

SCOPES

Press 5

Recent news and press coverage referencing this provider.

Special Topics Archive

FHFA 2025 AI Compliance Plan

Fannie Mae Launches AI Fraud Detection Technology ...

Mortgage Lender Sentiment Survey

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Lifecycle

Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

PrivacyPolicy

TermsOfService

TermsOfUse

Plans

Company 5

The organization behind the API

LinkedIn

Website

News

Careers

Blog

Other 5

Properties that don't map to a standard resource type

Single-Family Business

Single-Family Business

Multifamily Business

Multifamily Business

Capital Markets

Capital Markets

Data and Insights

Data and Insights

OpenIDConnect

OpenIDConnect

Source (apis.yml)

aid: fannie-mae
name: Fannie Mae
url: https://raw.githubusercontent.com/api-evangelist/fannie-mae/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fannie-mae.png
type: Index
access: 3rd-Party
position: Consuming
created: '2024-12-25'
modified: '2026-09-07'
specificationVersion: '0.23'
tags:
- Housing
- Mortgage
- Finance
- Government-Sponsored Enterprise
- Fortune 100
tags_raw:
- Housing
- Mortgages
- Finance
- GSE
- Fortune 100
apis: []
common:
- type: DomainSecurity
  url: security/fannie-mae-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/fanniemae
- type: LinkedIn
  url: https://www.linkedin.com/company/fanniemae
- type: Website
  url: https://www.fanniemae.com/
- type: DeveloperPortal
  url: https://developer.fanniemae.com/
- type: Single-Family Business
  url: https://singlefamily.fanniemae.com/
- type: Multifamily Business
  url: https://multifamily.fanniemae.com/
- type: Capital Markets
  url: https://capitalmarkets.fanniemae.com/
- type: Data and Insights
  url: https://www.fanniemae.com/research-and-insights
- type: News
  url: https://www.fanniemae.com/newsroom
- type: Careers
  url: https://www.fanniemae.com/careers
- type: PrivacyPolicy
  url: https://www.fanniemae.com/about-us/corporate-governance/online-privacy-notice
- type: TermsOfService
  url: https://www.fanniemae.com/about-us/legal-disclosure
- url: https://www.fanniemae.com/newsroom
  type: Blog
- type: Documentation
  url: https://singlefamily.fanniemae.com/applications-technology/application-programming-interfaces-apis-developer-portal
- type: GettingStarted
  url: https://developer.fanniemae.com/#/get-started
- type: Support
  url: https://developer.fanniemae.com/#/support
- type: SignUp
  url: https://auth.pingone.com/4c2b23f9-52b1-4f8f-aa1f-1d477590770c/saml20/idp/startsso?spEntityId=p1c-puma-GED-p1-saml-devportal-DirectRegistration
- type: StatusPage
  url: https://singlefamily.fanniemae.com/applications-technology/technology-application-availability
- type: TermsOfUse
  url: https://www.fanniemae.com/tech-guide
- type: Authentication
  url: authentication/fannie-mae-authentication.yml
- type: OAuthScopes
  url: scopes/fannie-mae-scopes.yml
- type: OpenIDConnect
  url: https://fmsso.fanniemae.com/.well-known/openid-configuration
- type: WellKnown
  url: well-known/fannie-mae-well-known.yml
- type: Conformance
  url: conformance/fannie-mae-conformance.yml
- type: VulnerabilityDisclosure
  url: security/fannie-mae-vulnerability-disclosure.yml
- type: Security
  url: security/fannie-mae-vulnerability-disclosure.yml
- type: ChangeLog
  url: changelog/fannie-mae-changelog.yml
- type: Lifecycle
  url: lifecycle/fannie-mae-lifecycle.yml
- type: LLMsTxt
  url: llms/fannie-mae-llms.txt
- type: Plans
  url: plans/fannie-mae-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fannie-mae-rate-limits.yml
description: Fannie Mae, officially known as the Federal National Mortgage Association, is a government-sponsored enterprise
  that plays a critical role in the American housing market. Established in 1938, Fannie Mae operates as a secondary mortgage
  lender, purchasing mortgages from banks and other financial institutions. By buying these loans, Fannie Mae helps to provide
  liquidity to the mortgage market, enabling banks to lend more money to homebuyers. Fannie Mae operates a developer portal
  that hosts API integrations for mortgage industry partners; access typically requires authenticated business relationships.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-09-07'
  status: enriched
  artifacts_added: 13
  pass: local-v3
x-tags-removed:
- Federal Government

Fannie Mae API — frequently asked questions

How do I authenticate with the Fannie Mae API?

Fannie Mae documents its authentication (4 schemes). The details are profiled on APIs.io as Fannie Mae Authentication.

Is the Fannie Mae API ready for AI agents?

Fannie Mae has a Kin Score of 32.8 out of 100 (thin) and an Agent Readiness score of 20.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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