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

39.7/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-03 · rubric v0.9

AccessFreemiumSelf serveFree trial⚡ Free to try

12 APIs

Property DataReal EstateLocation DataValuationAVMAssessmentMortgageNeighborhood

Kin Score

Kin Score How this is scored →
scored 2026-08-03 · rubric v0.9

Composite quality — 39.7/100 · thin

Contract Quality 15.9 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.1 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 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.

ATTOM Area API

Area geography, geoId lookups, and boundaries (v2/v4).

ATTOM Assessment API

County tax assessment data.

ATTOM Community API

Neighborhood and community context (v4).

ATTOM Events API

Consolidated all-event property history.

ATTOM Home Equity API

Estimated home equity and loan-to-value.

ATTOM Mortgage API

Property records enriched with mortgage and owner data.

ATTOM POI API

Points of interest (v4).

ATTOM Property API

Core property characteristics packages.

ATTOM Sales API

Recorded sale, deed, sales history, and sales trend data.

ATTOM School API

Schools, school districts, and attendance zones.

ATTOM Transportation Noise API

Modeled transportation-noise scores.

ATTOM Valuation API

Automated Valuation Model (AVM) and rental value.

Scroll for all 12

Open Collections 1

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

ATTOM API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Attom Data Plans Pricing

3 plans

PLANS

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.

Attom Data Finops

FINOPS

Security Posture 2

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

Attom Data Authentication

apiKey · 1 scheme

SECURITY

Attom Data Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Attom Data Agentic Access

37 operations

37 operations · 0 acting

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
created: '2026-07-03'
modified: '2026-07-03'
specificationVersion: '0.19'
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:
  - 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

Where this information came from

This is an independent, third-party profile of ATTOM, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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