Real Estate Data APIs and MCP Servers: What's Available in 2026
For most investors and small builders, RentCast is the easiest real estate data API to start with: a free tier of 50 requests a month, paid plans from $74 a month, and property records, value and rent estimates, comps and listings behind one key. ATTOM is the deeper dataset for bigger products (its Basic Property API starts at $500 a month), and Realie is a low-cost option built around an MCP server. MLS data is different: there's no open MLS API, and each MLS licenses its feed, usually to brokers and their vendors.
Disclosure: Deal Run is our product. It isn't one of the APIs on this page; it's mentioned in the MCP section and near the end, for readers who want finished analysis rather than raw data.
Three kinds of real estate data, three kinds of access
Before you compare vendors, know which kind of data you need, because each one comes with different rules:
- Public records. Owner, parcel number, tax assessment, deeds, mortgages, liens. Counties publish these, so any vendor can collect and resell them. Most "property data APIs" are mostly this. If you only need a handful of properties, you can pull property records free from the county yourself.
- MLS listing data. Active listings, photos, and in many markets the sold prices and days on market. This belongs to each MLS, and you can only get it under that MLS's license (more below).
- Derived data. Automated value estimates, rent estimates, comp selections, "likely to sell" scores. Each vendor builds its own, so quality varies, and an automated estimate isn't an ARV you can underwrite a flip on.
Sold prices are the hard part. In non-disclosure states such as Texas and Utah the deed is public but the price usually isn't, so a public-records API may show the sale without the number. Ask any vendor how it fills those gaps before you pay. Our guide to non-disclosure states covers which states are affected.
Property data APIs compared
Ranked for a real estate investor or a small team building their own tools: data that answers investor questions, a price you can see before you talk to sales, and a way to start small.
| API | Best for | Price (checked Oct 29, 2026) | Free tier or trial | MCP server |
|---|---|---|---|---|
| 1. RentCast | Value and rent estimates, comps, listings, records | $74/mo (1,000 requests), $199 (5,000), $449 (25,000); overage $0.06 to $0.015 per request | 50 requests/mo free | Yes |
| 2. ATTOM (Estated is now part of ATTOM) | Deep nationwide records for larger products | Basic Property API from $500/mo; Premium on request | Free trial (30 days per its FAQ) | Yes |
| 3. Realie | Low-cost records for AI agents | $50/mo (1,250 tokens), $150 (6,000), $350 (30,000) | 25 tokens/mo free | Yes |
| 4. PropertyRadar | Owner data, lists and contacts for investors | API included on Solo $119/mo ($99 annual), Team $249 ($199), Business $599 ($549); exports and contacts billed per record | 5-day trial (checked Oct 30, 2026) | Not mentioned on its pricing or developer pages |
| 5. DealMachine | Lead data, enrichment and comps from its app | Plans from $99/mo; Scale $599 per package/mo (100K records, 10 seats) | Not stated on the pricing page | Yes |
| 6. Regrid | Parcel boundaries and parcel records | Self-serve monthly plans; prices not published on the pages we could load | 30-day free API sandbox | Yes |
| 7. BatchData | High-volume records, skip tracing, enrichment | Property data from $1,000/mo (100,000 records); skip tracing from $2,000/mo | Not stated on the pricing page | Listed ("self-hosted") |
1. RentCast — the easiest place to start
RentCast says its API covers 150+ million property records, with owner, tax and sale history, plus value and rent estimates with comparables, sale and rental listings in all 50 states, and market statistics for 38,000+ zip codes. Its data comes from county records, recorded deeds, tax assessor databases and online feeds. The draw is that you can sign up and make calls today without a sales call, and the price per request drops as you move up a plan. The catch: its value and rent numbers are automated estimates, so treat them as a starting point, not an ARV.
2. ATTOM — the deepest dataset, priced for products
ATTOM says it covers 160+ million U.S. properties, with ownership, sales history, mortgages, foreclosures, permits, assessor and tax data, schools, crime and neighborhood data. Estated's site now says "Estated is now ATTOM." The Basic Property API starts at $500 a month and Premium is quote-only, so ATTOM fits a product or a team with steady volume more than a single investor. Its free trial is the way to test coverage in your counties first.
3. Realie — cheapest paid entry, built for AI agents
Realie sells nationwide property records through a REST API, a command-line tool and an MCP server, with a free tier and paid plans from $50 a month. Plans are measured in tokens shared between its web platform and API, and its pricing page doesn't say how many tokens a request uses, so run the free tier against your real queries before you pick a plan. It doesn't publish coverage counts on the pages we checked.
4. PropertyRadar — investor data with the API included
PropertyRadar is an investor and marketing data platform first. Its API comes with every plan and offers 250+ search criteria, list building, owner information and phone and email appends. Results that return records count as exports or contact purchases, billed like the rest of your account. It's a good fit if you already use PropertyRadar for lists and want to automate them, for example through its Zapier integration if you don't code.
5. DealMachine — lead data with a hosted MCP server
DealMachine includes API, command-line and webhook access on every plan, and it runs a hosted MCP server that lets an AI assistant search properties and people, enrich records by address, APN, phone or name, and run comps. Its MCP guide says the tools spend credits like the rest of DealMachine, one per unique record, while counts and field lookups are free. Plans start at $99 a month.
6. Regrid — when you need parcels
Regrid is the parcel specialist: 160M+ parcel records and parcel boundary tiles you can put on a map. If you're building anything that draws lots or needs land data, it's the one to test. It offers a 30-day free sandbox, then self-serve monthly plans; above 10,000 records a month it's an enterprise conversation.
7. BatchData — volume pricing for big pipelines
BatchData sells monthly record allowances: property data from $1,000 a month for 100,000 records, skip tracing from $2,000 a month, plus add-ons such as deed history, valuations, permits and comps. That's cheap per record at scale and expensive if you need a few hundred lookups. It suits a company running a large data pipeline, not a solo investor.
Commercial-property datasets such as CoStar, Reonomy and Cherre are outside this comparison, which covers residential investor data. For investor apps with a screen instead of an API, see our roundup of the best property data tools.
Is there an API for MLS data?
Yes, technically, but not one you can just sign up for. The standard is the RESO Web API, and RESO says MLSs owned and run by REALTOR® associations are required by the National Association of REALTORS® to offer production access to their data through it. RESO itself doesn't provide any data. You get each MLS's data after you agree to that MLS's data use and licensing policies, and then its technology vendor issues your credentials.
Most MLSs hand distribution to one of a few platforms:
| Platform | Who runs it | How access works | Price (checked Oct 29, 2026) |
|---|---|---|---|
| Spark API | FBS (Flexmls) | Access only for authorized MLS members, under roles the MLS sets; IDX and VOW data plans | Not published |
| MLS Grid | MLS Grid | Vendors sign one standard license and get one feed for the participating MLSs | Not published |
| Bridge | Zillow Group | Access starts with the MLS; you request each MLS dataset and sign its license | Set by each MLS; not published |
| Trestle | Cotality (formerly CoreLogic) | The MLS approves each connection by use case; 105 MLS organizations listed | Not published for data users |
The license types matter more than the platform. Spark's documentation puts it simply: IDX is for consumers (listings a broker shows on a public website) and VOW is for customers (a logged-in client portal that can include sold information). There are also broker back-office and other licenses, and in practice each one is tied to a broker or agent who belongs to that MLS. REcolorado's process on Bridge is typical: create an application, request the dataset, then sign the license agreement the MLS gives you for your use case and fill in its questionnaire. Fees come from the MLS's data licensing team.
So as an unlicensed investor, your realistic routes are a broker who will sponsor a feed for a product you build together, an agent who sends you sold data, or a licensed product that already shows MLS data to members. Our guide on how to get MLS access as an investor walks through each route and what it costs, and MLS vs public records for comps explains when you actually need MLS data and when county records are enough.
Is there a real estate MCP server for ChatGPT or Claude?
Yes. MCP (Model Context Protocol) is an open standard for connecting AI apps to outside data and tools. Its own site calls it "a USB-C port for AI applications," and lists Claude and ChatGPT among the AI assistants that support it, along with developer tools such as VS Code and Cursor. A vendor's MCP server lets you ask the AI a plain-English question ("pull the owner and last sale for this address") and have it call the vendor's data directly instead of guessing.
Vendors that described an MCP server on their own sites when I checked on October 29, 2026:
- RentCast: hosted at developers.rentcast.io/mcp. It searches the API docs, and with your API key in the request header it makes live data calls. A paid RentCast API subscription is needed for those.
- ATTOM: an MCP server for its property details, value estimates, comps and sales history, which it says works across AI providers that support MCP, including OpenAI and Anthropic.
- Realie: a property data MCP server with OAuth sign-in and no API key to paste; its site shows a one-line setup for Claude Code.
- DealMachine: hosted at mcp.dealmachine.com, with a Claude Desktop setup in its guide.
- Regrid: a new MCP server for its parcel data.
- BatchData: an MCP server listed among its solutions as self-hosted data infrastructure, with no price shown.
- Trestle: Trestle MCP is offered to MLS organizations at no cost, so this is for MLSs and their licensed users, not the public.
Three things to know before you connect one:
- It spends your credits. An AI can make many calls to answer one question. DealMachine says its MCP tools spend credits exactly like the rest of its app. Watch usage for the first week.
- The license still applies. MCP changes how you ask, not what you're allowed to do with the data. Display, storage and resale terms are the same as the vendor's API.
- The AI can still be wrong. It can pick the wrong property or misread a field. Check the address and parcel number on anything you'll make an offer from.
Setup differs by app and plan. In general you add the vendor's MCP server address as a connector in Claude or ChatGPT, then sign in or add your API key, so follow the vendor's own guide.
Deal Run (our product): we’re adding a way to connect Deal Run to ChatGPT, Claude or Grok, for readers who want analysis rather than raw data. It isn’t available in those apps yet. Once connected, you ask about any property address and it pulls MLS-grade comps, estimates repairs and works out your max offer; for a deal you’re selling, it finds buyers, and up to 75% come back with a phone or email, and the contact data is 97% accurate, according to our skip-trace provider (November 2026); results vary by location. It will cost $2 to analyze a deal, or $20 to analyze and sell ($18 more if it’s already analyzed), paid from a prepaid balance added in the browser, any amount from $2. Your plan’s deals are used first. Your AI app tells you the price and asks before every spend, and there’s a free sample deal. Until then, see Deal Run’s plans, and our guide on whether ChatGPT can analyze a real estate deal. Developers can request access to Deal Run’s REST API.
How to choose: a quick worked example
Say you want to look up about 2,000 properties a month. On RentCast's Foundation plan that's $74 for the first 1,000 requests plus 1,000 × $0.06 = $60 in overage, about $134 a month. The Growth plan is $199 with 5,000 requests included, so Foundation wins at that volume. At 4,000 lookups, Foundation would be $74 + $180 = $254, and Growth's flat $199 is cheaper. One property lookup may take more than one request, though, if you also want a value estimate or comps, so test with your own workflow before you commit. The same math applies to every vendor: included volume, overage rate, and how many calls one answer really takes.
Then check three things for your own counties: coverage of the fields you need, how the vendor handles sold prices in non-disclosure states, and whether its license lets you store and show the data the way you plan to.
If you want the analysis rather than raw data
Deal Run is our product. If what you actually need is comps, an ARV and a max offer on one property, rather than a feed to build on (see property data APIs vs Deal Run), Deal Run does that in a web and iPhone app: sold and rental comps, ARV, repair estimates from the property's photos, and a max offer for flip, rental and wholesale exits, for any address in all 50 states. See how Deal Run's comp analysis works, or try the public demo on the homepage and see the analysis before you pay. Analyze is $29 a month.
Frequently Asked Questions
What is the best real estate data API?
For most investors and small builders, RentCast is the easiest place to start: it has a free tier of 50 requests a month, paid plans from $74 a month, and covers property records, value and rent estimates, comps and listings. ATTOM is the deeper dataset for bigger products, with its Basic Property API starting at $500 a month. Realie is a low-cost option built around an MCP server.
Is there an API for MLS data?
Yes, but not an open one. MLSs deliver data through the RESO Web API standard, using platforms such as Spark, MLS Grid, Bridge and Trestle. Each MLS decides who gets its data and under which license, usually a broker or a vendor working for a broker. An investor without a license generally can't get a feed directly.
Is there a free real estate data API?
Several have free tiers that are fine for testing. On October 29, 2026, RentCast offered 50 free requests a month, Realie offered 25 free tokens a month, ATTOM offered a free trial, and Regrid offered a 30-day free API sandbox. None of them is free at real volume.
Is there a real estate MCP server for ChatGPT or Claude?
Yes. On October 29, 2026, RentCast, ATTOM, Realie, DealMachine and Regrid each described an MCP server on their own sites, and BatchData listed one. MCP is an open standard that Claude and ChatGPT both support, so the AI can query the vendor's data directly. You still need an account with the vendor, and the AI's requests use your plan's credits.
How much does a property data API cost?
On the vendors' own sites, checked October 29, 2026: RentCast runs $74 to $449 a month, Realie $50 to $350 a month, ATTOM starts at $500 a month, and BatchData's property data plans start at $1,000 a month. Per-request overage fees apply once you pass the included volume.
Sources and Check Dates
- RentCast API, rentcast.io/api: plans, included requests, overage rates, free tier, 150+ million records, listings in all 50 states, 38k+ zip codes, MCP server. Checked October 29, 2026.
- RentCast API docs, developers.rentcast.io/reference/introduction: data sources (county records, deeds, assessor databases, online feeds). Checked October 29, 2026.
- RentCast AI tools, developers.rentcast.io/reference/ai-tools: MCP server address, API key header, subscription needed for live data. Checked October 29, 2026.
- ATTOM Property Data API, attomdata.com/solutions/property-data-api: 160+ million properties, data types, free 30-day trial (FAQ), MCP server. Checked October 29, 2026.
- ATTOM API pricing, attomdata.com/solutions/delivery/property-data-api/pricing: Basic Property starting at $500/month, Premium on request. Checked October 29, 2026.
- ATTOM MCP Server, attomdata.com/solutions/mcp-server: data exposed, works with MCP-capable AI providers. Checked October 29, 2026.
- Estated, estated.com: "Estated is now ATTOM." Checked October 29, 2026.
- Realie pricing, realie.ai/pricing: Free, Tier 1, 2 and 3 prices and tokens, shared tokens. Checked October 29, 2026.
- Realie home page, realie.ai: REST, CLI and MCP access, OAuth MCP setup, Claude Code command. Checked October 29, 2026.
- PropertyRadar pricing, propertyradar.com/pricing: plan prices, API access on all plans. Checked October 29, 2026.
- PropertyRadar API, developers.propertyradar.com: 250+ criteria, lists, owner info, phone and email appends, per-record billing, Zapier. Checked October 29, 2026.
- DealMachine pricing, dealmachine.com/pricing: API, CLI and webhooks on every plan, plans from $99/mo, Scale $599 per package. Checked October 29, 2026.
- DealMachine MCP guide, dealmachine.com/guides/mcp-server: hosted server, tools, credit use, Claude Desktop setup. Checked October 29, 2026.
- Regrid API, regrid.com/api: 160M+ parcel records, 30-day free sandbox, enterprise above 10,000 records/month, MCP server. Checked October 29, 2026. Its self-serve plans page did not load for us.
- BatchData pricing, batchdata.io/pricing: property data and skip tracing plans, add-ons, MCP server listing. Checked October 29, 2026.
- RESO Web API, reso.org/reso-web-api: the standard, NAR requirement for association-owned MLSs, RESO provides no data, access by MLS license. Checked October 29, 2026.
- Spark API, sparkapi.io and sparkplatform.com/docs/overview/api: FBS's RESO Web API, access for authorized MLS members only, IDX for consumers, VOW for customers with sold data. Checked October 29, 2026.
- MLS Grid, mlsgrid.com: one license and one feed for vendors, RESO compliant. Checked October 29, 2026.
- REcolorado data licensing, recolorado.com/data: the Bridge request, license agreement and questionnaire steps; pricing from its data licensing team. Checked October 29, 2026.
- Bridge ownership, Zillow Group press release, August 2, 2016: Zillow Group acquired Bridge Interactive. Checked October 29, 2026.
- Trestle, cotality.com/real-estate/multiple-listing-enterprise-solutions/trestle: MLS-approved connections, 105 MLS organizations, Trestle MCP at no cost to MLSs. The old corelogic.com Trestle page now redirects to cotality.com. Checked October 29, 2026.
- Model Context Protocol, modelcontextprotocol.io/introduction: definition, USB-C comparison, Claude and ChatGPT support. Checked October 29, 2026.
- Deal Run features and plans: our own product and pricing page. Checked October 29, 2026.