HUD - US Department of Housing and Urban Development

The U.S. Department of Housing and Urban Development (HUD) provides public REST APIs for fair housing data, Fair Market Rents, Income Limits, USPS ZIP code crosswalk files, Comprehensive Housing Affordability Strategy (CHAS) data, and housing counseling agency search. All HUD User dataset APIs require a free bearer token obtained from the HUD User portal; the Housing Counselor search API is publicly accessible without authentication.

HUD - US Department of Housing and Urban Development publishes 5 APIs on the APIs.io network, including CHAS API, Fair Market Rents API, Housing Counseling API, and 2 more. Tagged areas include Housing, Government, Fair Market Rent, Mortgage, and Community Development.

The HUD - US Department of Housing and Urban Development catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

HUD - US Department of Housing and Urban Development’s developer surface includes product news, support, API reference, getting-started guide, signup flow, authentication, documentation, and 32 more developer resources.

🌐 Visit website 📡 Source on GitHub

60.3/100 strong ▬ flat Agent 33/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreeOpen⚡ Free to try

5 APIs

Housing GovernmentFair Market RentMortgageCommunity DevelopmentPublic HousingSection 8Income Limits

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 60.3/100 · strong

Contract Quality 13.0 / 21

Developer Ergonomics 7.3 / 17

Access Clarity 10.7 / 17

Operational Transparency 5.8 / 11

Contract Governance 2.9 / 10

Discoverability 6.9 / 9

Regulatory Posture 8.6 / 15

Agent readiness — 33/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/.

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 github.com/api-evangelist/hud: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

HUD User Fair Market Rents API

Provides Fair Market Rent (FMR) data by state, county, and metropolitan area. Returns efficiency through four-bedroom rental rates used as the basis for Section 8 Housing Choice...

HUD User Income Limits API

Returns HUD Income Limits at 30%, 50%, and 80% of Area Median Income (AMI) thresholds by geographic area. Used to determine eligibility for HUD housing assistance programs.

HUD User USPS ZIP Code Crosswalk API

Maps USPS ZIP codes to and from census tracts, counties, CBSAs, congressional districts, and county subdivisions. Supports geographic lookups and crosswalk queries for housing a...

HUD User CHAS API

Comprehensive Housing Affordability Strategy (CHAS) data provides custom tabulations of American Community Survey data on housing needs at national, state, county, and municipal...

HUD Housing Counselor Search API

Search for HUD-approved housing counseling agencies by name, city, state, or geographic coordinates. Returns agency contact information and services offered. No API key required.

HUD - US Department of Housing and Urban Development CHAS API

Comprehensive Housing Affordability Strategy data

HUD - US Department of Housing and Urban Development Fair Market Rents API

Fair Market Rent data by geography

HUD - US Department of Housing and Urban Development Housing Counseling API

HUD-approved housing counseling agency search

HUD - US Department of Housing and Urban Development Income Limits API

Area Median Income limits by geography

HUD - US Department of Housing and Urban Development ZIP Code Crosswalk API

ZIP code to geographic area crosswalk queries

Scroll for all 10

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

HUD User CHAS API

OPEN COLLECTION

HUD User CHAS Fair Market Rents API

OPEN COLLECTION

HUD User CHAS Housing Counseling API

OPEN COLLECTION

HUD User CHAS Income Limits API

OPEN COLLECTION

HUD User CHAS ZIP Code Crosswalk API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Hud Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hud Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Hud Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Hud Context

0 classes · 67 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

HUD - US Department of Housing and Urban Development API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

HUD Fair Market Rent

8 properties

JSON SCHEMA

HUD Housing Counseling Agency

31 properties

JSON SCHEMA

HUD Income Limits

9 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Hud Fair Market Rent Example

1 fields

EXAMPLE

Hud Income Limits Example

1 fields

EXAMPLE

Hud Usps Zip Crosswalk Example

1 fields

EXAMPLE

Security Posture 3

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

Hud Authentication

http · 1 scheme

SECURITY

Hud Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Hud Vulnerability Disclosure

Hackerone

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Hud Agentic Access

8 operations

8 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgenticAccess

AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

GitHubOrg

GitHubOrg

Access & Security 4

Authentication, authorization, and security posture

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

PrivacyPolicy

TermsOfService

Pricing

Plans

FinOps

Company 4

The organization behind the API

News

News

Website

Website

LinkedIn

Blog

Blog

Other 7

Properties that don't map to a standard resource type

Open Data

HUD USER

HUD GIS

FHA

HUD Exchange

Data.gov HUD Catalog

Data.gov HUD Catalog

Scroll for all 7

Source (apis.yml)

aid: hud
name: HUD - US Department of Housing and Urban Development
description: The U.S. Department of Housing and Urban Development (HUD) provides public REST APIs for fair housing data, Fair
  Market Rents, Income Limits, USPS ZIP code crosswalk files, Comprehensive Housing Affordability Strategy (CHAS) data, and
  housing counseling agency search. All HUD User dataset APIs require a free bearer token obtained from the HUD User portal;
  the Housing Counselor search API is publicly accessible without authentication.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/hud.png
url: https://raw.githubusercontent.com/api-evangelist/hud/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Housing
- Government
- Fair Market Rent
- Mortgage
- Community Development
- Public Housing
- Section 8
- Income Limits
apis:
- name: HUD User Fair Market Rents API
  description: Provides Fair Market Rent (FMR) data by state, county, and metropolitan area. Returns efficiency through four-bedroom
    rental rates used as the basis for Section 8 Housing Choice Voucher payment standards.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - Fair Market Rent
  - Housing
  - Section 8
  properties:
  - type: Documentation
    url: https://www.huduser.gov/portal/dataset/fmr-api.html
  - type: Authentication
    url: https://www.huduser.gov/hudapi/public/register
- name: HUD User Income Limits API
  description: Returns HUD Income Limits at 30%, 50%, and 80% of Area Median Income (AMI) thresholds by geographic area. Used
    to determine eligibility for HUD housing assistance programs.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.huduser.gov/portal/dataset/api.html
  baseURL: https://www.huduser.gov/hudapi/public/il
  tags:
  - Income Limits
  - Housing Assistance
  - AMI
  properties:
  - type: Documentation
    url: https://www.huduser.gov/portal/dataset/api.html
  - type: Authentication
    url: https://www.huduser.gov/hudapi/public/register
- name: HUD User USPS ZIP Code Crosswalk API
  description: Maps USPS ZIP codes to and from census tracts, counties, CBSAs, congressional districts, and county subdivisions.
    Supports geographic lookups and crosswalk queries for housing analysis.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.huduser.gov/portal/dataset/uspszip-api.html
  baseURL: https://www.huduser.gov/hudapi/public/usps
  tags:
  - ZIP Code
  - Crosswalk
  - Geography
  - Census
  properties:
  - type: Documentation
    url: https://www.huduser.gov/portal/dataset/uspszip-api.html
  - type: Authentication
    url: https://www.huduser.gov/hudapi/public/register
- name: HUD User CHAS API
  description: Comprehensive Housing Affordability Strategy (CHAS) data provides custom tabulations of American Community
    Survey data on housing needs at national, state, county, and municipal levels. Used for Consolidated Planning submissions.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.huduser.gov/portal/dataset/chas-api.html
  baseURL: https://www.huduser.gov/hudapi/public/chas
  tags:
  - CHAS
  - Housing Affordability
  - Community Planning
  - ACS
  properties:
  - type: Documentation
    url: https://www.huduser.gov/portal/dataset/chas-api.html
  - type: Authentication
    url: https://www.huduser.gov/hudapi/public/register
- name: HUD Housing Counselor Search API
  description: Search for HUD-approved housing counseling agencies by name, city, state, or geographic coordinates. Returns
    agency contact information and services offered. No API key required.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://data.hud.gov/housing_counseling.html
  baseURL: https://data.hud.gov/Housing_Counselor/search
  tags:
  - Housing Counseling
  - Agency Search
  - Public
  properties:
  - type: Documentation
    url: https://data.hud.gov/housing_counseling.html
- aid: hud:hud-chas-api
  name: HUD - US Department of Housing and Urban Development CHAS API
  description: Comprehensive Housing Affordability Strategy data
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - CHAS
  properties:
  - type: OpenAPI
    url: openapi/hud-chas-api-openapi.yml
- aid: hud:hud-fair-market-rents-api
  name: HUD - US Department of Housing and Urban Development Fair Market Rents API
  description: Fair Market Rent data by geography
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - Fair Market Rents
  properties:
  - type: OpenAPI
    url: openapi/hud-fair-market-rents-api-openapi.yml
- aid: hud:hud-housing-counseling-api
  name: HUD - US Department of Housing and Urban Development Housing Counseling API
  description: HUD-approved housing counseling agency search
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - Housing Counseling
  properties:
  - type: OpenAPI
    url: openapi/hud-housing-counseling-api-openapi.yml
- aid: hud:hud-income-limits-api
  name: HUD - US Department of Housing and Urban Development Income Limits API
  description: Area Median Income limits by geography
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - Income Limits
  properties:
  - type: OpenAPI
    url: openapi/hud-income-limits-api-openapi.yml
- aid: hud:hud-zip-code-crosswalk-api
  name: HUD - US Department of Housing and Urban Development ZIP Code Crosswalk API
  description: ZIP code to geographic area crosswalk queries
  humanURL: https://www.huduser.gov/portal/dataset/fmr-api.html
  baseURL: https://www.huduser.gov/hudapi/public/fmr
  tags:
  - ZIP Code Crosswalk
  properties:
  - type: OpenAPI
    url: openapi/hud-zip-code-crosswalk-api-openapi.yml
common:
- type: Open Data
  url: https://data.hud.gov/
- type: HUD USER
  url: https://www.huduser.gov/portal/home.html
- type: HUD GIS
  url: https://hudgis-hud.opendata.arcgis.com/
- type: FHA
  url: https://www.hud.gov/fha
- type: HUD Exchange
  url: https://www.hudexchange.info/
- type: News
  url: https://www.hud.gov/press
- type: Support
  url: https://www.hud.gov/contactus
- type: PrivacyPolicy
  url: https://www.hud.gov/aboutus/privacy-policy
- type: Data.gov HUD Catalog
  url: https://catalog.data.gov/dataset?organization=hud-gov
- type: GitHubOrganization
  url: https://github.com/hudgov
- type: DeveloperPortal
  url: https://www.huduser.gov/hudapi/public
- type: APIReference
  url: https://www.huduser.gov/portal/dataset/uspszip-api.html
- type: GettingStarted
  url: https://www.huduser.gov/portal/dataset/fmr-api.html
- type: SignUp
  url: https://www.huduser.gov/hudapi/public/register
- type: TermsOfService
  url: https://www.huduser.gov/portal/dataset/api-terms-of-service.html
- type: Security
  url: https://www.hud.gov/vulnerability-disclosure-policy
- type: Conventions
  url: conventions/hud-conventions.yml
- type: ErrorCatalog
  url: errors/hud-problem-types.yml
- type: Lifecycle
  url: lifecycle/hud-lifecycle.yml
- type: Conformance
  url: conformance/hud-conformance.yml
- type: DataModel
  url: data-model/hud-data-model.yml
- type: Packages
  url: packages/hud-packages.yml
- type: VulnerabilityDisclosure
  url: security/hud-vulnerability-disclosure.yml
- type: X-MCPServerCandidate
  url: mcp/hud-mcp.yml
- type: LLMsTxt
  url: llms/hud-llms.txt
- type: AgenticAccess
  url: agentic-access/hud-agentic-access.yml
- type: DomainSecurity
  url: security/hud-domain-security.yml
- type: Authentication
  url: authentication/hud-authentication.yml
- type: Website
  url: https://www.hud.gov/
- type: Documentation
  url: https://www.huduser.gov/portal/dataset/api.html
- type: GitHubOrg
  url: https://github.com/HUD-Data-Lab
- type: LinkedIn
  url: https://www.linkedin.com/company/us-department-of-housing-and-urban-development/
- type: Blog
  url: https://www.hud.gov/press/blog
- type: Pricing
  url: https://www.huduser.gov/portal/dataset/api-terms-of-service.html
- type: StatusPage
  url: https://data.hud.gov/
- type: X
  url: https://x.com/HUDgov
- type: Plans
  url: plans/hud-plans-pricing.yml
- type: RateLimits
  url: rate-limits/hud-rate-limits.yml
- type: FinOps
  url: finops/hud-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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