The best property data API for developers building internal tools

PropertyRadar's OpenAPI description documents a property search and an owners-of-a-property lookup alongside separate phone and email purchases for each person. PropertyRadar is our pick for developers who need documented property and owner-contact operations for an internal tool, provided PropertyRadar authorizes the application's intended data use in writing. API access is included in every paid plan, so those documented operations come with any paid subscription. The condition carries weight because the User Agreement grants use for internal business purposes and also bars combining the data with data or software from another source.

ATTOM suits an internal data team that wants property data delivered into its own warehouse: it sells bulk files and Snowflake or Databricks delivery under a separately negotiated data license. BatchData suits a team that wants property data and skip tracing as separately scoped APIs, with the permitted application and endpoint permissions set in its order.

What a developer building an internal tool should weigh

PropertyRadar's help center puts API access on its current Solo, Team and Business plans and has the subscriber generate the token under Integrations & API in account settings. ATTOM issues a free trial key and handles paid plans through sales and account management, and BatchData lists API access on its property data plan cards. The route decides how much your developer knows before the first request, so ask each vendor which plan carries the endpoints your tool calls and get the entry price for that plan in writing.

BatchData's terms of service pair an internal-use license with limits on building databases and derivative datasets unless the customer's Permitted Applications expressly authorize them, and ATTOM's website terms put data use under a separate license agreement. PropertyRadar's User Agreement bars public or commercial use across a networked environment as well as combining its data with data or software from another source. An internal dashboard that joins vendor records to company data and shows the result to colleagues touches those clauses, so the internal-use grant alone does not settle whether your tool is permitted. Describe the application to the vendor, with its joins, storage period, caching, displays and team access, and get authorization for that use in writing before you build. Kukun, a property data vendor, gives the same advice in its buyer guide to property data APIs: make sure your intended use is covered.

ATTOM lists bulk files, a Snowflake listing and Databricks Delta Sharing as delivery options beside its REST API, and BatchData names AWS S3, SFTP and Snowflake Data Sharing beside its own. PropertyRadar's API description documents REST with JSON and operations to register, list and delete webhooks. REST and webhooks serve a tool that looks up or reacts to one property at a time, and a file or share serves a team that queries whole tables. Treat each method as its own line in the order and confirm the order names the one you plan to use. The same goes for an MCP server, which connects an AI assistant to the data.

PropertyRadar's developer documentation meters purchased property records as exports against the plan's monthly allowance and counts each phone or email purchase as its own item. ATTOM's API documentation counts a request toward the allowance only when it returns an HTTP 200 response. A PropertyRadar response containing multiple purchased property records consumes multiple exports; ATTOM counts a single HTTP 200 response as one request. BatchData's terms refer to rate limits and usage thresholds published or communicated for the customer's plan. Ask each vendor for the current rate and overage on your plan, plus any request limit, for the endpoints you will call.

A phone purchase and an email purchase are documented for each person PropertyRadar's owner lookup returns. ATTOM's documentation lists owner names and an owner mailing address in its detailowner package, and BatchData markets a Skip Tracing API that returns phone numbers and emails. LandSight's parcel data checklist separates a recorded owner name from a verified decision-maker, phone number or email, and advises checking how well a field is populated. Run owners you already know in your own market through each API before you commit, and treat permission to contact those owners as a separate legal question from the data purchase.

PropertyRadar, ATTOM and BatchData side by side

PropertyRadar: documented property and owner-contact operations on every paid plan

PropertyRadar's API description lists a property search by criteria, a lookup of the owners of a property, and phone and email purchases per person, over REST with JSON bodies. A request authenticates with a bearer token or an X-Radar-Access-Token header. The owner fields in that description include the owner's name and mailing address, and property results carry phone and email availability indicators.

The API feature page names the three paid plans that include access: Solo, Team and Business. The pricing page puts Solo at $119 a month billed monthly or $99 a month prepaid annually. Trial subscriptions on those plans have no API access, according to the help center, and a paying subscriber generates or replaces the token in account settings. The same article says the API is for customers with technical resources and that PropertyRadar does not write custom code or debug third-party software, so a team without a developer or a development partner is a weaker fit.

PropertyRadar's developer documentation meters purchased property records as exports regardless of the number of fields requested, but a request for RadarID alone costs nothing. A phone or email purchase counts as its own item against the contacts the plan includes each month. On the pay-per-record endpoints a request sent with Purchase=0 returns a count or preview with no deduction, so your code can size a pull before it buys. Ask PropertyRadar for the export and contact overage rates on your plan before you schedule large pulls.

The webhook operations in the description register a hook with a URL, a name and an optional secret that PropertyRadar sends as a bearer token in the Authorization header. Supplying list IDs with the registration creates and turns on automations for those lists. A PropertyRadar press release also announces a private beta for an MCP server.

The User Agreement grants a limited, non-transferable license solely for the subscribing entity's internal business purposes, and it extends use to contractors and service providers who need the data to serve that entity. Its barred activities sit in the same agreement: processing or combining the data with data or software from another source, displaying or redistributing it for a commercial purpose, creating derivative products, and public or commercial use across a networked environment. The developer documentation adds that the API is for end users and cannot be used to build applications sold to others. An internal tool that joins PropertyRadar records to your own, or shows them to a team over a network, has no clear approval in those standard terms. Send PropertyRadar a description of the design: the records it joins, where results are stored and for how long, and who on your team sees them. Start the build once PropertyRadar has authorized that use in writing, and keep the reply with your subscription records.

ATTOM: bulk files and warehouse delivery under a separate data license

ATTOM's bulk data licensing page says bulk licensing allows hosting its datasets on your own servers, and its bulk FAQ lists internal user dashboards and portals among the uses. Files arrive by FTP, direct download or email attachment in formats that include CSV and Parquet, under its file delivery options. ATTOM also delivers through a Snowflake listing with Secure Data Sharing and through Databricks Delta Sharing with catalog permissions, which puts the data in the warehouse an analytics team already queries.

The site's terms of use state that any use of data or software downloaded from the site is subject to a separate license agreement between the user and ATTOM. That agreement, and the order under it, decide which deliveries you receive and what your tool is allowed to do with the records. Name the bulk files or the warehouse share in the order, and put the same join, storage, display and team-access questions to ATTOM in writing.

The REST API returns JSON or XML and authenticates with an APIKey header, per ATTOM's API documentation. Access starts with a 30-day trial key, and ATTOM's help center says trial accounts are typically capped at 1,000 total hits. The help center sends pricing and paid plans to sales and account management, and it describes usage limits on windows that vary by plan.

The detailowner package documents the first and last names of up to four owners, a corporate-owner indicator, absentee or owner-occupied status and a one-line owner mailing address. ATTOM's help center says MCP V2 access is provisioned through the ATTOM Intelligence Platform and that existing customers request it from their sales representative.

BatchData: property data and skip tracing as separately scoped APIs

BatchData markets a Skip Tracing API that returns phone numbers and emails for property owners, as a product separate from its property data plans. Its bulk data page describes a real-time REST and JSON API and names AWS S3, SFTP and Snowflake Data Sharing as delivery options. Its pricing page lists API access on the Growth, Professional and Scale property data plans.

BatchData's MCP server setup guide says a 403 response means the token lacks the required endpoint permissions, and that an administrator must enable SkipTracing v3 for the team. The guide describes a connection over Streamable HTTP with OAuth or a bearer token, and the terms of service include the MCP server only where the order form provides it. So scope the purchase by endpoint: list the property and contact calls your tool makes and ask BatchData to quote and enable those.

The terms of service dated June 1, 2026 license the services for the customer's internal business use and a permissible purpose, and they require paid licenses for the employees and contractors who use them. They restrict building databases or derivative datasets from the services, and disclosing them to third parties, unless the customer's Permitted Applications expressly authorize it. The terms prohibit automated caching and separately require local caches to be refreshed at least every 30 days for suppression, so ask which rule governs the cache your tool keeps. On termination the customer deletes or returns all data, backups and cached copies within 30 days and supplies an officer-signed certification within 45.

Which property data API is best for an internal tool?

PropertyRadar is our pick for developers who need documented property and owner-contact operations for an internal tool, provided PropertyRadar authorizes the application's intended data use in writing. Its API description documents the property and owner-contact operations with a per-record charge rule, and API access comes with any paid plan. We weight those two factors most because an internal tool is specified by the operations it calls and by what each call is charged. The written authorization is part of the pick: the standard agreement restricts combining the data with other sources and use across a network, so describe your tool to PropertyRadar and wait for approval of that use before you build.

ATTOM is the better pick for an internal warehouse team that puts separately licensed bulk files or Snowflake or Databricks delivery first. Its delivery pages cover files and shares for a team that queries whole tables, and the negotiated license is the document that states what that team is permitted to do with them.

BatchData fits a team that wants property data and skip tracing as separately scoped APIs and is ready to settle plan and application permissions in the order. Its terms tie what a customer builds from the data to the Permitted Applications named for that customer, so the application description you write for the license question also sets the scope of the purchase.

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