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ATTOM Assessment API

County tax assessment data.

ATTOM Assessment API is one of 12 APIs that ATTOM publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Assessment. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 3 operations across 3 paths, and defines 4 schemas. It is described by OpenAPI 3.0.3, at version 1.0.0.

Requests are made against a single base URL, https://api.gateway.attomdata.com.

3 operations 3 paths 4 schemas 3 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.3
API Version
1.0.0
Base URL
https://api.gateway.attomdata.com/propertyapi/v1.0.0
Authentication
API Key
Resource Areas
1

Authentication & Security 1

ATTOM Assessment API declares 1 security scheme for authenticating requests. An API key is passed in the header as apikey (apiKeyAuth). By default, every request must be authenticated.

  • apiKeyAuth — Your unique ATTOM API key, assigned by ATTOM and passed in the apikey request header. Also send Accept: application/json (or application/xml).

Paths & Operations 3

Across 3 paths, the API surfaces 3 operations — 3 GET. Each is listed below with its method, path, parameters, and response codes.

Assessment 3

County tax assessment data.

GET
/propertyapi/v1.0.0/assessment/detail
Assessment detail
getAssessmentDetail 3 params → 200401
GET
/propertyapi/v1.0.0/assessment/snapshot
Assessment snapshot
getAssessmentSnapshot 4 params → 200401
GET
/propertyapi/v1.0.0/assessmenthistory/detail
Assessment history detail
getAssessmentHistoryDetail 3 params → 200401

Schemas 4

The contract defines 4 schemas that model the data the API accepts and returns. The most detailed are Property (10 properties), Status (6 properties), PropertyResponse (2 properties), StatusEnvelope (1 property). Each schema is shown below with its type and property counts.

Property
object
A property record. ATTOM returns a rich, package-dependent object; key groups are summarized here.
10 properties
Status
object
The status block returned on every ATTOM response.
6 properties
PropertyResponse
object
2 properties
StatusEnvelope
object
1 property

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

attom-data-assessment-api-openapi.yml Raw ↑

Other APIs ATTOM publishes across the network.

ATTOM Area API
ATTOM Community API
ATTOM Events API
ATTOM Home Equity API
ATTOM Mortgage API
ATTOM POI API
ATTOM Property API
ATTOM Sales API
ATTOM School API
ATTOM Transportation Noise API
ATTOM Valuation API