SimplyRETS MCP server

Search SimplyRETS MLS listings and open houses; read listing and market analytics. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect SimplyRETS50 free tool calls a month

What can I ask?

Turn on the SimplyRETS connector, then ask in plain words. The AI picks the tools.

What you can do with SimplyRETS in Claude and ChatGPT

For real estate agents and developers who work with MLS listing data through SimplyRETS.

Search MLS listings by price, beds, city and more

The AI searches listings by keyword, status, type, price, beds, baths, city, zip, features or a map area, and returns address, price, photos and agent.

Read the full details of one listing

The AI fetches a listing by its SimplyRETS id, with address, price, photos, agent, office, property details, school, tax and remarks.

Find upcoming open houses

The AI lists open houses with their listing, filtered by city, agent, broker, price, beds, baths or start date, and reads one open house by key.

Get market statistics for an area

The AI reads statistics for the listings a search matches, such as count, average price, bedrooms, living area and year built, and the listings per area.

Check the price per square foot of a listing

The AI reads analytics for one listing, such as its price per square foot, next to its details.

Look up agents and brokerage offices

The AI lists the agent roster and the brokerage offices of the MLS feed, with contact details and offices.

How do I connect SimplyRETS?

Before you connect

The login page asks for your SimplyRETS API key and SimplyRETS API secret.

Find both on your app at simplyrets.com/account (Apps). To try it without an account, use the public demo pair simplyrets / simplyrets (trial data only; everyone who uses the demo pair shares one usage count, so do not subscribe on it: use your own app's key for that). Your credentials are used only to call the SimplyRETS API on your behalf; the secret is never shown to anyone.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name SimplyRETS and this URL, then click Add:
    https://simplyrets.usefulapi.io/mcp
  3. Claude opens the login page: enter your SimplyRETS API key and SimplyRETS API secret.
  4. In a chat, click + → Connectors and turn on SimplyRETS.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name SimplyRETS and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://simplyrets.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your SimplyRETS API key and SimplyRETS API secret.
  4. In Plugins, install SimplyRETS, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http simplyrets https://simplyrets.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "simplyrets": {
      "url": "https://simplyrets.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "simplyrets": {
      "type": "http",
      "url": "https://simplyrets.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add simplyrets --url https://simplyrets.usefulapi.io/mcp
codex mcp login simplyrets

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://simplyrets.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your SimplyRETS API key and SimplyRETS API secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Proper API key$9/mo · $90/yr10,000 tool calls / month
Pro+per API key$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this SimplyRETS server only. Ask your AI to run simplyrets_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with simplyrets_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with simplyrets_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 14

Show all 14 tools (the AI picks them for you)

Read only · 10

  • Get account infosimplyrets_get_account_info
    What these API credentials can reach: the MLS vendor ids (needed as `vendor` on multi-MLS apps), the time of each vendor's last sync, usernames and the available endpoints (/properties, /openhouses, /agents, /offices, /properties/analytics). OPTIONS /.
  • Get feed metadatasimplyrets_get_feed_metadata
    Values present in an MLS feed, to build valid searches: statuses, property types, cities, counties, neighborhoods, areas and features, plus the last sync time. OPTIONS /properties.
  • Search listingssimplyrets_search_listings
    Search MLS listings (SimplyRETS /properties): by keyword, status, type, price, beds, baths, area, year, city, zip, neighborhood, agent, broker, features or a map polygon. Returns address, price, status, photos, agent, office, property details and remarks, without empty fields. Pass count=true to get the total. Page with next.offset or next.lastId.
  • Get listingsimplyrets_get_listing
    One listing by its SimplyRETS id (`mlsId`, the number in search results; NOT the public MLS number `listingId`). Full detail: address, geo, price, photos, agent, office, property, school, tax, remarks.
  • List open housessimplyrets_list_open_houses
    Upcoming open houses with the listing they belong to: filter by property type, listing id, city, broker, agent, price, size, beds, baths and start date. Page with next.offset or next.lastId.
  • Get open housesimplyrets_get_open_house
    One open house by its key (the `openHouseKey` of a list result).
  • List agentssimplyrets_list_agents
    The agent roster of the MLS feed: id, name, address, contact and office. Needs the Agents API add-on on your SimplyRETS app (the demo credentials return an empty list).
  • List officessimplyrets_list_offices
    The brokerage office roster of the MLS feed, newest modification first. Needs the Offices API add-on on your SimplyRETS app (the demo credentials cannot use it). Pass count=true for the total.
  • Get market analyticssimplyrets_get_market_analytics
    Statistics for the listings a search matches (same filters as simplyrets_search_listings): total count, average price, bedrooms, full baths, living area, lot size and year built, and the number of listings per area. Use it for market summaries of a city, zip or price band.
  • Get listing analyticssimplyrets_get_listing_analytics
    Analytics for one listing, such as its price per square foot.

Your usefulapi plan · 4

  • Usage status (free-tier meter)simplyrets_usage_status
    Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
  • Request a missing featuresimplyrets_request_feature
    Tell usefulapi that the user needs something the SimplyRETS tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
  • Upgrade to Pro or Pro+simplyrets_upgrade
    Get a paid plan for SimplyRETS (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
  • Cancel the Pro subscriptionsimplyrets_cancel_subscription
    Cancel the caller's SimplyRETS Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run simplyrets_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with SimplyRETS in Claude or ChatGPT?

Search MLS listings by price, beds, city and more. Read the full details of one listing. Find upcoming open houses. Get market statistics for an area. Check the price per square foot of a listing. Look up agents and brokerage offices. See what you can do for the details.

Is this an official SimplyRETS product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by SimplyRETS. The server calls the SimplyRETS API with your own SimplyRETS access, so it sees only the data that your account can see.

Can I connect SimplyRETS to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your SimplyRETS API key and SimplyRETS API secret. See Before you connect for where to find them.

Do I put my SimplyRETS key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your SimplyRETS API key and SimplyRETS API secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my SimplyRETS credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the SimplyRETS API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in SimplyRETS.

Can the AI change my SimplyRETS data?

All 10 SimplyRETS tools are marked read-only.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this SimplyRETS server only. Cancel any time: your paid plan then runs to the end of the paid period. Run simplyrets_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run simplyrets_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run simplyrets_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a SimplyRETS tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with simplyrets_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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