🇺🇸Real Estate in United States

14 real estate providers in United States, publishing 45 APIs.

14 providers 45 published APIs 170 indexed documents

Real Estate in United States — 14 providers on the APIs.io network sit in both cohorts, and between them they publish 45 indexed APIs.

10 of the 14 publish at least one machine-readable API; 4 publish nothing indexed at all. That split is the first thing worth reading here — a vertical can be well represented in a market and still have almost no programmable surface.

By Kin Score band: 5 developing, 5 emerging, 3 thin, and 1 minimal.

Leading by rating: Spark Platform, Lone Wolf Technologies, RESO (Real Estate Standards Organization), Trestle, Anywhere Real Estate, Keller Williams, and 8 more.

Country membership is exact-tag only. A provider lands in United States when one of its own top-level tags names the country — there is no headquarters signal on the country axis, unlike the region axis which reads tag, provider-name pattern, and stated HQ. So this cell is a floor, not a census, and it understates by construction — a real estate company headquartered in United States that never tags itself is counted nowhere on this axis. The region cuts read the wider signal set and will generally hold more.

Providers (14)

Provider Description APIs Rating
Spark Platform Spark Platform is the MLS data platform built by FBS, a 100% employee-owned company in Fargo, North Dakota that has served the US Multiple Listing Service industry for over 30 y... 3 developing
Lone Wolf Technologies Lone Wolf Technologies is the dominant back-office, transaction-management and forms vendor in North American residential real estate, headquartered in Dallas, Texas and backed ... 6 developing
RESO (Real Estate Standards Organization) RESO, the Real Estate Standards Organization, is the United States industry body that writes and certifies the machine-readable contract for residential real estate data. It pub... 2 developing
Trestle Trestle is the real estate data distribution platform operated by CoreLogic (rebranded Cotality in 2025), sitting between roughly 500 US Multiple Listing Services and the techno... 4 developing
Anywhere Real Estate Anywhere Real Estate Inc. (formerly Realogy Holdings Corp., NYSE: HOUS) is one of the largest residential real estate services companies in the United States, headquartered at 1... 23 developing
Keller Williams Keller Williams Realty, Inc. (KWRI) is an Austin, Texas headquartered residential real estate franchisor and the largest real estate brokerage franchise in the United States by ... 1 thin
Offerpad Offerpad Solutions Inc. (NYSE: OPAD), headquartered in Chandler, Arizona, is a United States iBuyer and licensed residential real estate brokerage that buys homes directly from ... 1 thin
National Association of REALTORS The National Association of REALTORS (NAR) is the largest trade association in the United States, representing roughly one million members across residential and commercial real... 1 thin
Homes.com Homes.com is a United States residential real estate portal owned by CoStar Group, which acquired the property in 2021 and folded the Homesnap agent application into it — homesn... 0 emerging
RE/MAX RE/MAX Holdings, Inc. (NYSE: RMAX, SIC 6531, Denver, Colorado) is one of the world's largest real estate brokerage franchisors, licensing the RE/MAX brand to independently owned... 3 emerging
Apartments.com Apartments.com is the largest United States rental-listings marketplace, owned by CoStar Group since its 2014 acquisition and operated from Arlington, Virginia as the anchor of ... 0 emerging
PlotAPI Automotive and property data API. The published surface covers US VIN histories and vehicle specifications, UK MOT records, auto parts fitment catalogues, vehicle valuations, an... 1 emerging
Douglas Elliman Douglas Elliman Inc. (NYSE: DOUG) is a residential real estate brokerage founded in 1911 and headquartered at 575 Madison Avenue, New York City. It is one of the largest brokera... 0 emerging
MISMO MISMO — the Mortgage Industry Standards Maintenance Organization — is the standards development body for US real estate finance, founded in 1999 and a not-for-profit wholly owne... 0 minimal

Indexed API documents (170)

Two numbers, both real: these providers publish 45 APIs as their own documents, which the catalog indexes split one-per-resource into 170 documents.

Spark API

FBS's proprietary REST API over Flexmls MLS content. Documented services include Listings (plus photos, documents, floor plans, videos, v...

Spark RESO Web API

Spark's implementation of the RESO Web API, exposed as an OData service at the /Reso/OData endpoint and serving data shaped by the RESO D...

Spark Webhooks

Outbound webhook delivery from the Spark platform. When a Property, Member or Office record changes in an upstream MLS, Spark POSTs a RES...

Lone Wolf Authentisign API

E-signature API for Authentisign, Lone Wolf's signing product. Creates and manages signings, signer roles, documents and signing status. ...

Lone Wolf Technologies Accounts API

The Accounts API from Lone Wolf Technologies — 1 operation(s) for accounts.

Lone Wolf Technologies Authentication API

The Authentication API from Lone Wolf Technologies — 6 operation(s) for authentication.

Lone Wolf Technologies Authorization API

OAuth 2.0 client credentials token endpoint.

Lone Wolf Technologies Business Contact API

The Business Contact API from Lone Wolf Technologies — 8 operation(s) for business contact.

Lone Wolf Technologies Business Contacts API

Business contacts represent a business or third party that is part of a transaction such as a home inspector or a lawyer. They do not rep...

Lone Wolf Technologies C Cs API

The CCs API from Lone Wolf Technologies — 2 operation(s) for ccs.

Lone Wolf Technologies Classification API

The Classification API from Lone Wolf Technologies — 2 operation(s) for classification.

Lone Wolf Technologies Classifications API

Classifications relate to the commission structure of a transaction.

Lone Wolf Technologies Client Contact API

The Client Contact API from Lone Wolf Technologies — 8 operation(s) for client contact.

Lone Wolf Technologies Client Contacts API

Client contacts represent a buyer or seller that is part of a transaction. For all other types of contacts, use business contacts.

Lone Wolf Technologies Commission API

The Commission API from Lone Wolf Technologies — 2 operation(s) for commission.

Lone Wolf Technologies Commission Fees API

Represents fees that are associated with commissions.

Lone Wolf Technologies Commissions API

Represents the commissions and the related agent's within the brokerage that receive those commissions. For commissions related to agent'...

Lone Wolf Technologies Condition API

The Condition API from Lone Wolf Technologies — 2 operation(s) for condition.

Lone Wolf Technologies Condition Type API

The Condition Type API from Lone Wolf Technologies — 2 operation(s) for condition type.

Lone Wolf Technologies Condition Types API

Represents some common conditions that can be added to transactions.

Lone Wolf Technologies Conditions API

Represents the conditions that exist on the transaction before it can be closed.

Lone Wolf Technologies Contact Type API

The Contact Type API from Lone Wolf Technologies — 2 operation(s) for contact type.

Lone Wolf Technologies Contact Types API

Represents the types of contacts for both business and client.

Lone Wolf Technologies Contacts API

Manage transaction contacts.

Lone Wolf Technologies Deal API

The Deal API from Lone Wolf Technologies — 7 operation(s) for deal.

Lone Wolf Technologies Deposit API

The Deposit API from Lone Wolf Technologies — 2 operation(s) for deposit.

Lone Wolf Technologies Deposits API

Represents the deposits that have are required for the transaction.

Lone Wolf Technologies Documents API

The Documents API from Lone Wolf Technologies — 17 operation(s) for documents.

Lone Wolf Technologies Employees API

Represents a person that works at the brokerage. This includes the broker themselves, office admins, agent's, everyone.

Lone Wolf Technologies External Agent API

The External Agent API from Lone Wolf Technologies — 8 operation(s) for external agent.

Lone Wolf Technologies External Agents API

Represents agents that are on the transaction but are not part of the brokerage.

Lone Wolf Technologies External Commission API

The External Commission API from Lone Wolf Technologies — 2 operation(s) for external commission.

Lone Wolf Technologies External Commissions API

Represents the external commissions and the related external agent's that are not part of the brokerage that receive those commissions. F...

Lone Wolf Technologies Features API

Represents the different features that are enabled or disabled for a client.

Lone Wolf Technologies Folders API

Manage folders within transactions.

Lone Wolf Technologies Form Libraries API

Browse form libraries and library forms (Forms Design service).

Lone Wolf Technologies Forms and Documents API

Manage forms and file documents within transactions.

Lone Wolf Technologies History API

The History API from Lone Wolf Technologies — 1 operation(s) for history.

Lone Wolf Technologies Layouts API

The Layouts API from Lone Wolf Technologies — 3 operation(s) for layouts.

Lone Wolf Technologies Members API

The Members resource is a RESTful web resource running on Microsoft's Web API allowing third parties to access member data. The following...

Lone Wolf Technologies Metadata API

Retrieve metadata and property specifications for API resources

Lone Wolf Technologies Offers API

Manage offers on transactions.

Lone Wolf Technologies Offices API

Represents the different physical offices that make up the brokerage.

Lone Wolf Technologies Other Endpoints API

Additional endpoints including users, form libraries, and transaction forms

Lone Wolf Technologies Participants API

The Participants API from Lone Wolf Technologies — 3 operation(s) for participants.

Lone Wolf Technologies Property Type API

The Property Type API from Lone Wolf Technologies — 2 operation(s) for property type.

Lone Wolf Technologies Property Types API

Represents the different property types that can be associated to a transaction.

Lone Wolf Technologies Share Groups API

Share transactions with groups of users and manage group membership.

Lone Wolf Technologies Signings API

The Signings API from Lone Wolf Technologies — 23 operation(s) for signings.

Lone Wolf Technologies Single Sign On API

Generate one-time-use SSO links for the agent dashboard, transaction list, or a specific transaction

Lone Wolf Technologies Source of Business API

The Source of Business API from Lone Wolf Technologies — 1 operation(s) for source of business.

Lone Wolf Technologies Sources of Business API

Represents the different sources of business that were used to find the buyers and sellers.

Lone Wolf Technologies SSO API

The Sso API from Lone Wolf Technologies — 2 operation(s) for sso.

Lone Wolf Technologies Teams API

Manage team-based transaction access for agents in brokerage or team scenarios.

Lone Wolf Technologies Templates API

List and apply transaction templates.

Lone Wolf Technologies Tier API

The Tier API from Lone Wolf Technologies — 3 operation(s) for tier.

Lone Wolf Technologies Tiers API

Represents a tier or sub-transaction for a given transaction. All transactions must have at least one tier.

Lone Wolf Technologies Title Integration API

Allow title partners to update title order status and manage notes on transactions.

Lone Wolf Technologies Transaction Contact Types API

Manage contact type definitions

Lone Wolf Technologies Transaction Contacts API

Manage contacts associated with transaction files

Lone Wolf Technologies Transaction Documents API

Manage documents within transaction files

Lone Wolf Technologies Transaction Forms API

Manage forms attached to a transaction's form package (Forms Editor service).

Lone Wolf Technologies Transaction Statuses API

Manage transaction status definitions

Lone Wolf Technologies Transaction Summary API

Create, read, update, and delete transaction files and their property details

Lone Wolf Technologies Transaction Templates API

Read transaction templates available to a user.

Lone Wolf Technologies Transaction Types API

Manage transaction type definitions

Lone Wolf Technologies Transactions API

Represents a transaction.

Lone Wolf Technologies Users and Offices API

Users and offices belonging to a client account (Platform service).

RESO Web API

The RESO Web API is the ratified transport standard for real estate data, defined as a profile of OData 4.0/4.01 (Web API Core 2.0.0 and ...

RESO Cloud MCP Server

The RESO Cloud MCP Server is the one production API endpoint RESO itself operates. It speaks the Model Context Protocol over Streamable H...

Trestle RESO Web API

The primary Trestle interface — a RESO Web API 2.0 / OData 4.0 endpoint that republishes MLS data mapped to the RESO Data Dictionary. The...

Trestle Direct Web API

A bidirectional OData interface into the Matrix MLS database, separate from the RESO feed. The CRM reference documents Contacts, EmailHis...

Trestle Participant Reporting API

A compliance API that lets technology providers report to each MLS which brokers they hold contracts with — the mechanism by which the li...

Trestle RETS

Trestle's legacy Real Estate Transaction Standard interface, documented as compliant with RETS 1.8. RESO no longer updates the RETS speci...

Anywhere MLS Data Service API

Endpoints for MLS listings data assembled by Anywhere's MLS Data Platform (MDP), which downloads, processes and enriches listings from mu...

Anywhere Master Data (MDM) API

A bundle of APIs representing clean, curated master data for Agent, Office, Company, Staff and Listings entities, plus shared address and...

Anywhere Listing Syndication API

Synchronize marketing data for all Anywhere franchise brands and the brokerage group to an external system. Marketing data includes Compa...

Anywhere Dynamic Search API

Real-time search over Anywhere listing details for applications that do not maintain a local data store. Documented as short-response-tim...

Anywhere Listing Extensions API

A bundle of APIs for listings submitted through external and internal products, enhancing property listings with SMS Property ID, RealVit...

Anywhere Listings Promotions API

Synchronize promotion data from Anywhere, covering channels, publication lists in each channel, nominated listings and listings flagged i...

Anywhere Listing Metric API

Listing management metric information for Anywhere franchise brands, including video views, virtual tour views and listing views, availab...

Anywhere Marketing - Franchise API

Synchronize marketing data for all Anywhere franchise brands and brokerages, including Corporate Staff, Company, Office, Agent, Team, Lis...

Anywhere Marketing and Transactions API

Synchronize Anywhere marketing data together with franchise brokerage production (transaction) details. Marketing detail includes Corpora...

Anywhere Transactions - Franchise API

Synchronize brokerage production (transaction) data from Anywhere, including Sale and Other Income transactions and the associated buyer ...

Anywhere Back Office Management API

Write and update data into Anywhere systems, covering Listing, Transaction, Agent, Team, Office and Company data across all Anywhere fran...

Anywhere BackOffice Read-only API

Read-only access to Anywhere back-office data from the Dash platform, including listing, transaction, agent, team, office and company data.

Anywhere Leads Management API

Powers third-party CRM applications to sync lead data with Anywhere source systems so agents can manage leads and contacts in one place. ...

Anywhere Referral Leads API

Submit a new lead to Anywhere's referral platform for a specific real estate referral program and share status updates across the custome...

Anywhere Referral Partner Integration API

Submit a new lead to Anywhere's referral platform for a specific real estate referral program, creating a connected experience between th...

Anywhere Agent Recruiting API

An endpoint for third-party CRM integration partners to deliver recruiting activities into Anywhere's iProspect application, validated ag...

Anywhere Consumer Journey API

Track a consumer's real estate transaction end to end, giving buyers visibility into the closing process with clear milestones, action it...

Anywhere Earnest Money API

Manage and access earnest money data for brokered trades: payee search, buyer and seller retrieval for a deal, creation of disbursement r...

Anywhere Settlement Company API

Exposes Anywhere Integrated Services settlement companies and their details, letting a consuming application retrieve settlement companie...

Anywhere Relocation Authorization API

Lets corporate clients trigger new relocation initiations or authorizations into Cartus. Authorizations are processed, a new customer fil...

Anywhere RealVitalize API

Allows HomeAdvisor to integrate its backend services with the RealVitalize backend — accessing enrollment information and adding or updat...

Anywhere User Access Management API

Build and manage user access to Anywhere brand extranet applications and build user access reports. Exposes a user's profile plus the lis...

Anywhere Leads Engine API

Handles ingestion, routing and assignment of leads for Anywhere brands. Listed on the developer portal home page as a Partner-visibility ...

KW Partner Identity API (OpenID Connect)

Keller Williams uses OpenID Connect on top of OAuth 2.0 to grant a partner application access to an individual KW user's Command data. Th...

KW Marketplace Subscription & Metered Billing API

The partner-facing surface behind the KW Marketplace, where vendors sell products to Keller Williams agents. Keller Williams pushes subsc...

Keller Williams Search API

The Search API from Keller Williams — 5 operation(s) for search.

Offerpad Helix API (private customer backend)

Offerpad's real transaction API, and it is closed. Discovered on 2026-07-26 as the API_URL constant compiled into the Offerpad Connect si...

Offerpad Block Directory API

WordPress block-directory resource routes.

Offerpad Block Patterns API

WordPress block-patterns resource routes.

Offerpad Block Renderer API

WordPress block-renderer resource routes.

Offerpad Block Types API

WordPress block-types resource routes.

Offerpad Blocks API

WordPress blocks resource routes.

Offerpad Categories API

WordPress categories resource routes.

Offerpad Comments API

WordPress comments resource routes.

Offerpad E Floating Buttons API

WordPress e-floating-buttons resource routes.

Offerpad Elementor Library API

WordPress elementor_library resource routes.

Offerpad Elementor Snippet API

WordPress elementor_snippet resource routes.

Offerpad Font Collections API

WordPress font-collections resource routes.

Offerpad Font Families API

WordPress font-families resource routes.

Offerpad Global Styles API

WordPress global-styles resource routes.

Offerpad Icons API

WordPress icons resource routes.

Offerpad Index API

WordPress index resource routes.

Offerpad Locations API

WordPress locations resource routes.

Offerpad Media API

WordPress media resource routes.

Offerpad Menu Items API

WordPress menu-items resource routes.

Offerpad Menu Locations API

WordPress menu-locations resource routes.

Offerpad Menus API

WordPress menus resource routes.

Offerpad Navigation API

WordPress navigation resource routes.

Offerpad Pages API

WordPress pages resource routes.

Offerpad Pattern Directory API

WordPress pattern-directory resource routes.

Offerpad Plugins API

WordPress plugins resource routes.

Offerpad Posts API

WordPress posts resource routes.

Offerpad Review API

WordPress review resource routes.

Offerpad Search API

WordPress search resource routes.

Offerpad Settings API

WordPress settings resource routes.

Offerpad Sidebars API

WordPress sidebars resource routes.

Offerpad States API

WordPress states resource routes.

Offerpad Statuses API

WordPress statuses resource routes.

Offerpad Tags API

WordPress tags resource routes.

Offerpad Taxonomies API

WordPress taxonomies resource routes.

Offerpad Template Parts API

WordPress template-parts resource routes.

Offerpad Templates API

WordPress templates resource routes.

Offerpad Themes API

WordPress themes resource routes.

Offerpad Types API

WordPress types resource routes.

Offerpad Users API

WordPress users resource routes.

Offerpad Widget Types API

WordPress widget-types resource routes.

Offerpad Widgets API

WordPress widgets resource routes.

Offerpad Wp Pattern Category API

WordPress wp_pattern_category resource routes.

National Association of REALTORS Association API

The Association API from National Association of REALTORS — 3 operation(s) for association.

National Association of REALTORS Data Extract Request API

The DataExtractRequest API from National Association of REALTORS — 4 operation(s) for dataextractrequest.

National Association of REALTORS Data Extract Schedule API

The DataExtractSchedule API from National Association of REALTORS — 4 operation(s) for dataextractschedule.

National Association of REALTORS Member API

The Member API from National Association of REALTORS — 11 operation(s) for member.

National Association of REALTORS Member Address API

The MemberAddress API from National Association of REALTORS — 2 operation(s) for memberaddress.

National Association of REALTORS Member Certification API

The MemberCertification API from National Association of REALTORS — 2 operation(s) for membercertification.

National Association of REALTORS Member Coe API

The MemberCoe API from National Association of REALTORS — 2 operation(s) for membercoe.

National Association of REALTORS Member Demographic API

The MemberDemographic API from National Association of REALTORS — 2 operation(s) for memberdemographic.

National Association of REALTORS Member Designation API

The MemberDesignation API from National Association of REALTORS — 2 operation(s) for memberdesignation.

National Association of REALTORS Member Dues Payment API

The MemberDuesPayment API from National Association of REALTORS — 2 operation(s) for memberduespayment.

National Association of REALTORS Member Education API

The MemberEducation API from National Association of REALTORS — 2 operation(s) for membereducation.

National Association of REALTORS Member Education Level API

The MemberEducationLevel API from National Association of REALTORS — 2 operation(s) for membereducationlevel.

National Association of REALTORS Member Email API

The MemberEmail API from National Association of REALTORS — 2 operation(s) for memberemail.

National Association of REALTORS Member Fair Housing API

The MemberFairHousing API from National Association of REALTORS — 2 operation(s) for memberfairhousing.

National Association of REALTORS Member Field Of Business API

The MemberFieldOfBusiness API from National Association of REALTORS — 2 operation(s) for memberfieldofbusiness.

National Association of REALTORS Member Isc Affiliation API

The MemberIscAffiliation API from National Association of REALTORS — 2 operation(s) for memberiscaffiliation.

National Association of REALTORS Member Language API

The MemberLanguage API from National Association of REALTORS — 2 operation(s) for memberlanguage.

National Association of REALTORS Member Military Service API

The MemberMilitaryService API from National Association of REALTORS — 2 operation(s) for membermilitaryservice.

National Association of REALTORS Member MLS API

The MemberMLS API from National Association of REALTORS — 2 operation(s) for membermls.

National Association of REALTORS Member Phone API

The MemberPhone API from National Association of REALTORS — 2 operation(s) for memberphone.

National Association of REALTORS Member Secondary API

The MemberSecondary API from National Association of REALTORS — 2 operation(s) for membersecondary.

National Association of REALTORS Member Single Owned MLS API

The MemberSingleOwnedMLS API from National Association of REALTORS — 1 operation(s) for membersingleownedmls.

National Association of REALTORS Office API

The Office API from National Association of REALTORS — 5 operation(s) for office.

National Association of REALTORS Office Secondary API

The OfficeSecondary API from National Association of REALTORS — 2 operation(s) for officesecondary.

RE/MAX Europe Datahub API

The RE/MAX Europe Datahub API is the franchise-operations API behind the RE/MAX EU Datahub application. It exposes offices, persons, RE/M...

RE/MAX Europe Listings API

The RE/MAX Europe Listings API is used in conjunction with the RE/MAX EU Datahub application to add, update, retrieve and delete property...

RE/MAX Europe Site API (WordPress REST)

The RE/MAX Europe marketing site at remax.eu runs WordPress and exposes the WordPress REST API anonymously at /wp-json/. The route descri...

PlotAPI REST API

Single REST surface for vehicle specifications, VIN history, MOT records, parts fitment, valuations and property listings. Operations cou...

Other industries in United States

Banking & Open Banking 85 Financial Services 81 Data & Analytics 72 Education & EdTech 47 Energy 29 Healthcare 29 Digital Health & Telehealth 27 Government & Public Sector 26 Insurance 21 Venture Capital & Investing 20 Climate & Sustainability 17 Cybersecurity & Identity 17 All of United States →

Real Estate elsewhere

North America 119 Europe 72 United Kingdom & Ireland 45 Latin America 22 Australia & New Zealand 19 Southeast Asia 18 Middle East 13 France & Iberia 12 DACH (Germany · Austria · Switzerland) 11 India & South Asia 10 Greater China 6 Japan & Korea 3 All of Real Estate →

This page is the intersection of two independently computed cohorts: United States and Real Estate. A provider appears here only when it is already a member of both. United States membership is matched on tag, so this is a floor rather than a census — coverage gaps show up here as small numbers, not as absent pages.

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  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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