ATTOM

ATTOM Data Solutions is a national property, real estate, and location data provider that curates a multi-sourced warehouse of data on 158+ million U.S. properties. The ATTOM API (also delivered as ATTOM Cloud) exposes that data over REST as a family of logical resources - property characteristics, tax assessments, automated valuations (AVM), sales and deed history, mortgage records, area and boundary geographies, schools, community and neighborhood data, points of interest, transportation noise, all-event snapshots, and home equity - queried by address, APN/FIPS, ATTOM ID, radius, or geoIdV4 and authenticated with an API key.

ATTOM publishes 12 APIs on the APIs.io network, including Area API, Assessment API, Community API, and 9 more. Tagged areas include Property Data, Real-Estate, Location Data, Valuation, and AVM.

ATTOM’s developer surface includes authentication, documentation, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.2/100 thin ▬ flat Agent 23/100 agent aware Full breakdown ↓
scored 2026-08-24 · rubric v0.13.0

AccessFreemiumSelf serveFree trial⚡ Free to try

12 APIs

Property Data Real-Estate Location Data Valuation AVM Assessment Mortgage Neighborhood

Kin Score

Kin Score How this is scored →
scored 2026-08-24 · rubric v0.13.0

Composite quality — 38.2/100 · thin

Contract Quality 14.0 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 7.9 / 20

Operational Transparency 4.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 23/100 · agent aware

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 0 / 8

Request/Response Examples 0 / 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

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/attom-data: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 12

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

Open Collections 14

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

Rate Limits 1

Documented rate limits and quota policies.

Attom Data Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: attom-data
url: https://raw.githubusercontent.com/api-evangelist/attom-data/refs/heads/main/apis.yml
name: ATTOM
kind: company
description: ATTOM Data Solutions is a national property, real estate, and location data provider that curates a multi-sourced
  warehouse of data on 158+ million U.S. properties. The ATTOM API (also delivered as ATTOM Cloud) exposes that data over
  REST as a family of logical resources - property characteristics, tax assessments, automated valuations (AVM), sales and
  deed history, mortgage records, area and boundary geographies, schools, community and neighborhood data, points of interest,
  transportation noise, all-event snapshots, and home equity - queried by address, APN/FIPS, ATTOM ID, radius, or geoIdV4
  and authenticated with an API key.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Freemium (free trial) · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/attom-data.png
tags:
- Property Data
- Real-Estate
- Location Data
- Valuation
- AVM
- Assessment
- Mortgage
- Neighborhood
tags_raw:
- Property Data
- Real Estate
- Location Data
- Valuation
- AVM
- Assessment
- Mortgage
- Neighborhood
created: '2026-07-03'
modified: '2026-07-03'
specificationVersion: '0.23'
apis:
- aid: attom-data:attom-data-area-api
  name: ATTOM Area API
  description: Area geography, geoId lookups, and boundaries (v2/v4).
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Area
  properties:
  - type: OpenAPI
    url: openapi/attom-data-area-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-assessment-api
  name: ATTOM Assessment API
  description: County tax assessment data.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Assessment
  properties:
  - type: OpenAPI
    url: openapi/attom-data-assessment-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-community-api
  name: ATTOM Community API
  description: Neighborhood and community context (v4).
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Community
  properties:
  - type: OpenAPI
    url: openapi/attom-data-community-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-events-api
  name: ATTOM Events API
  description: Consolidated all-event property history.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/attom-data-events-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-home-equity-api
  name: ATTOM Home Equity API
  description: Estimated home equity and loan-to-value.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Home Equity
  properties:
  - type: OpenAPI
    url: openapi/attom-data-home-equity-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-mortgage-api
  name: ATTOM Mortgage API
  description: Property records enriched with mortgage and owner data.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Mortgage
  properties:
  - type: OpenAPI
    url: openapi/attom-data-mortgage-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-poi-api
  name: ATTOM POI API
  description: Points of interest (v4).
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - POI
  properties:
  - type: OpenAPI
    url: openapi/attom-data-poi-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-property-api
  name: ATTOM Property API
  description: Core property characteristics packages.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Property
  properties:
  - type: OpenAPI
    url: openapi/attom-data-property-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-sales-api
  name: ATTOM Sales API
  description: Recorded sale, deed, sales history, and sales trend data.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Sales
  properties:
  - type: OpenAPI
    url: openapi/attom-data-sales-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-school-api
  name: ATTOM School API
  description: Schools, school districts, and attendance zones.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - School
  properties:
  - type: OpenAPI
    url: openapi/attom-data-school-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-transportation-noise-api
  name: ATTOM Transportation Noise API
  description: Modeled transportation-noise scores.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Transportation Noise
  properties:
  - type: OpenAPI
    url: openapi/attom-data-transportation-noise-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
- aid: attom-data:attom-data-valuation-api
  name: ATTOM Valuation API
  description: Automated Valuation Model (AVM) and rental value.
  humanURL: https://api.developer.attomdata.com/docs
  baseURL: https://api.gateway.attomdata.com/propertyapi/v1.0.0
  tags:
  - Valuation
  properties:
  - type: OpenAPI
    url: openapi/attom-data-valuation-api-openapi.yml
  - type: Documentation
    url: https://api.developer.attomdata.com/docs
  - type: APIReference
    url: https://api.developer.attomdata.com/docs
  - type: PostmanCollection
    url: collections/attom-data.postman_collection.json
  - type: OpenCollection
    url: collections/attom-data.opencollection.json
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/612-attom-api-v4
  - type: Documentation
    url: https://cloud-help.attomdata.com/article/641-upgrading-to-poi-endpoint-v4
common:
- type: AgenticAccess
  url: agentic-access/attom-data-agentic-access.yml
- type: DomainSecurity
  url: security/attom-data-domain-security.yml
- type: Authentication
  url: authentication/attom-data-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/attom-data-solutions
- type: Website
  url: https://www.attomdata.com
- type: Documentation
  url: https://api.developer.attomdata.com/docs
- type: Plans
  url: plans/attom-data-plans-pricing.yml
- type: RateLimits
  url: rate-limits/attom-data-rate-limits.yml
- url: https://www.attomdata.com/feed/
  type: Blog
- type: FinOps
  url: finops/attom-data-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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