ATTOM API alternative: Korzy vs ATTOM (and Estated)

If you are evaluating the ATTOM API or the Estated API, this page sets Korzy and ATTOM side by side. ATTOM sells U.S. property data through a REST API, an MCP server and bulk licensing. Estated is now part of ATTOM.¹²³⁴ Korzy is an API and MCP server for U.S. parcels and the infrastructure around them. The comparison uses what each publishes about its own product, checked 5 November 2026.

Get a Korzy API key Compare all U.S. parcel data APIs

Korzy vs ATTOM (and Estated): pricing, coverage and access

Feature	Korzy	ATTOM
Pricing model	Monthly plans with credits; extra credits in packs	Monthly API plans; Premium priced on request⁵
Published entry price	$49/month (Professional, 3,000 credits)	Basic Property API from $500/month⁵
Free trial or free tier	No free trial	Free 30-day trial API key¹
Stated U.S. coverage	161M+ parcel records across every U.S. county	160+ million U.S. properties¹
REST API	Yes, REST with an OpenAPI spec	Yes, REST (JSON and XML)¹
MCP server	Hosted MCP server (OAuth or API key, 6 tools); plugins for Claude and ChatGPT; agent plugin for Claude Code, Codex and Hermes	Yes, the ATTOM MCP Server²
Owner names	Available on request (opt-in per organization), where published; through enrich at 2 credits per parcel instead of 1 credit	Yes: ownership and mortgage information in Basic and Premium⁵
Infrastructure and site context	Water and sewer service, flood zones, wetlands, protected areas and cleanup sites, rail, ports and freight, data-center projects, power plants, grid capacity and terrain	Schools, neighborhood and points of interest; environmental risk and natural hazards⁵⁶
Bulk files and licensing	Not through the API (lookups, records and enrichment of up to 25 parcels per request); dataset licensing and flat-file exports on Enterprise	Yes: bulk property data licensing to host the datasets yourself³

When ATTOM may fit better

You need valuation data: ATTOM AVM, rental AVM and sales comparables are in the Premium option.⁵
You need transaction history such as mortgages, pre-foreclosure and expanded sales history.⁵
You want to host a nationwide property dataset on your own servers.³
You are an existing Estated API customer: ATTOM continues to support that API.⁷

When Korzy may fit better

You need land and infrastructure context at the same point as the parcel: water and sewer service areas, data-center projects, power plants, rail, ports and freight corridors.
An AI agent should call the data directly: Korzy runs a hosted MCP server (OAuth or API key, 6 tools), with plugins for Claude and ChatGPT and an agent plugin for Claude Code, Codex and Hermes.
You want a published self-serve price: plans start at $49 a month, and the field catalog never spends credits.

Real example responses are on the parcel data pages for each county and in the Korzy API reference; plans and credits are on the pricing page.

What teams use Korzy for

Sources for the ATTOM comparison

Statements about ATTOM come from its own public pages, read on 5 November 2026. Statements about Korzy link to Korzy’s plans and prices and API documentation.

ATTOM, Property Data API, www.attomdata.com/solutions/delivery/property-data-api/, checked 5 November 2026.
ATTOM, MCP Server, www.attomdata.com/solutions/delivery/mcp-server/, checked 5 November 2026.
ATTOM, Bulk data licensing, www.attomdata.com/solutions/delivery/bulk-data-licensing/, checked 5 November 2026.
Estated home page, estated.com/, checked 5 November 2026.
ATTOM, Property Data API pricing, www.attomdata.com/solutions/delivery/property-data-api/pricing/, checked 5 November 2026.
ATTOM, announcement of the Estated acquisition, www.attomdata.com/news/company-news/attom-company-announcement-10/, checked 5 November 2026.
ATTOM help, Is the Estated API being replaced?, cloud-help.attomdata.com/article/661-is-estated-api-being-replaced, checked 5 November 2026.

More parcel data API comparisons

Try Korzy on your own addresses

Plans include the API, the MCP server and every dataset they serve. The field catalog is free, so you can see what each request returns and costs before you spend credits.

Get a Korzy API key See Korzy pricing Korzy MCP server docs