Search SimplyRETS MLS listings and open houses; read listing and market analytics. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"simplyrets": {
"url": "https://simplyrets.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"simplyrets": {
"type": "http",
"url": "https://simplyrets.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see 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.
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.
Turn on the SimplyRETS connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
simplyrets_get_account_info | read | 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 /. |
simplyrets_get_feed_metadata | read | 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. |
simplyrets_search_listings | read | 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 /properties. |
simplyrets_get_listing | read | 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. GET /properties/{mlsId}. |
simplyrets_list_open_houses | read | 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 /openhouses. |
simplyrets_get_open_house | read | Get open house One open house by its key (the `openHouseKey` of a list result). GET /openhouses/{openHouseKey}. |
simplyrets_list_agents | read | 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). GET /agents. |
simplyrets_list_offices | read | 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 /offices. |
simplyrets_get_market_analytics | read | 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 /properties/analytics. |
simplyrets_get_listing_analytics | read | Get listing analytics Analytics for one listing, such as its price per square foot. GET /properties/{mlsId}/analytics. |
simplyrets_usage_status | Usage status (free-tier meter) Report the caller's current free-tier usage this month: calls used, monthly limit, remaining, and whether the cap is reached. Read-only; does not count against the meter. | |
simplyrets_request_feature | Request a missing 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. | |
simplyrets_upgrade | Upgrade to Pro (unlimited) Subscribe to the Pro plan for UNLIMITED SimplyRETS tool calls (the free tier caps monthly usage). Choose monthly ($9/month) or yearly ($90/year — 2 months free) billing. Returns a Stripe Checkout link to open in your browser; after payment your account upgrades automatically. Does not count against the meter. | |
simplyrets_cancel_subscription | Cancel the Pro subscription Cancel the caller's SimplyRETS Pro subscription at the end of the paid period (no refund for the current period; unlimited calls continue 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. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper API key | $9/mo · $90/yr | Unlimited |
Pro covers this SimplyRETS server only. Subscribe with simplyrets_upgrade (it returns a Stripe Checkout link). Cancel any time with simplyrets_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running simplyrets_upgrade before then undoes the cancel. Or write to [email protected].
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.
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.
The login page asks for your SimplyRETS API key and SimplyRETS API secret. See Before you connect for where to find them.
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.
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.
All 10 SimplyRETS tools are marked read-only.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls, for this SimplyRETS server only. Run simplyrets_usage_status to see how many calls you used.
Ask the AI to run simplyrets_upgrade: it returns a Stripe Checkout link. To cancel, run simplyrets_cancel_subscription. Pro continues to the end of the paid period.
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.
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.