Which real estate APIs can I use with ChatGPT in 2026?

The published connector exposes six read-only tools: address lookup, parcel or APN lookup, filtered property search, nearby location search, comparable sales, and recorded-owner search. Parcel lookup uses the county and state to distinguish identifiers that may repeat across jurisdictions.

The returned records can include property characteristics, recorded ownership, assessments, sales history, mortgages, liens, and automated value estimates. Availability differs by property and source. Verify the fields your work needs on representative parcels before choosing a provider.

Consider Regrid when parcel boundaries and mapping attributes are central to the task. Its MCP documentation describes parcel geometry, ownership, assessed values, land use, and matched building footprints. Property retrieval requires a Regrid API token and uses the associated quota; documentation search alone does not retrieve parcels.

Regrid documents Claude and compatible MCP clients. Check its current instructions and your ChatGPT workspace’s connection support before choosing that route. Regrid also requires disabling model training and data sharing when using its data with AI platforms; follow the provider’s setup requirements.

ATTOM offers a property API covering ownership, property characteristics, deeds, mortgages, assessments, and sales history. It also documents an MCP server for AI applications, including property details, value estimates, comparables, and sales history. Compare the fields and access terms needed for your particular workflow.

An MCP offering is a connection option, not evidence that every ChatGPT account can install a directory app. Check the current ATTOM setup, account requirements, and host support. This guide does not treat API documentation as proof of a tested ChatGPT installation.

RentCast offers APIs for property records, value and rent estimates, sale and rental listings, and market data. It can fit an application that needs structured rental or listing research. Its listing documentation says those records are not retrieved directly from MLSs; do not describe that API as a licensed MLS feed.

Using a REST endpoint in an AI workflow requires an actual integration. Confirm how the tool will authenticate, which endpoint supplies the answer, and which usage rights apply. The existence of RentCast’s API does not itself establish a published ChatGPT app.

For available homes, start with a listing experience rather than a parcel-records API. Zillow and Redfin have announced ChatGPT apps for home search. These serve a different need from looking up an assessor record or retrieving a parcel boundary.

A connected home-search app does not grant unrestricted MLS access or bulk reuse rights. Zillow explains that its MLS-sourced content remains inside its controlled IDX experience. Check app availability in your own account and verify current listing status with the provider.

Compare the unit being billed, not just the advertised price. Realie counts successful calls toward its plan, while Regrid’s MCP guide describes quota consumption for returned parcels. One ChatGPT question may trigger several requests. Review the current provider terms and any separate ChatGPT requirements before connecting.

The Realie connector requires an account with API access; new accounts add a payment method to enable it. List calls return up to 10 properties with pagination. For software integration or large exports, compare REST API and bulk delivery separately rather than expecting an interactive chat to supply an unrestricted nationwide file.