RentCast MCP Server (unofficial)

An MCP server that lets Claude (or any MCP client) query the RentCast property API — rent and sale-value estimates, market stats, property records, and active listings — through six read-only tools.

Why it looks the way it does

• Read-only. All six tools only read; nothing here can change a RentCast account.

• A curated six, not a 1:1 API dump. These are the endpoints that make the best agent workflows, described so the model chains them correctly (e.g. list_active_listings → get_rent_estimate per address → rank by upside).

• Clean errors. A bad key, an inactive subscription, or a rate-limit comes back as a plain sentence the agent can act on, not a stack trace.

Install (≈3 minutes)

git clone https://github.com/hasankhadra/rentcast-mcp.git
cd rentcast-mcp
npm install && npm run build

Then add this to your Claude Desktop config — ~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows — and fully restart Claude Desktop:

{
  "mcpServers": {
    "rentcast": {
      "command": "node",
      "args": ["/absolute/path/to/rentcast-mcp/dist/index.js"],
      "env": {
        "RENTCAST_API_KEY": "your_rentcast_api_key"
      }
    }
  }
}

Replace the path with where you cloned the repo, and the key with your own from app.rentcast.io (the free tier is 50 requests/month — keep limit values modest). The six rentcast tools appear in the tools menu once Claude Desktop restarts.

Tools

All tools are read-only. Prices are USD; rents are USD/month; areas are square feet.

Try it

Once it's wired into Claude Desktop, ask:

"What's the rent estimate for 5500 Grand Lake Dr, San Antonio, TX 78244? How does it compare to the zip code's average rent?"

Claude calls get_rent_estimate for the address and get_market_stats for 78244, then compares — e.g. an estimated ~$1,630/mo against the zip's ~$1,555/mo average.

And the one a human can't do in a single step against the RentCast dashboard:

"Find 3-bed active rental listings in Austin, TX under $2,500/mo, and estimate the fair-market rent for each so I can spot the underpriced ones."

Claude calls list_active_listings (rental, Austin TX, 3 bed), filters by price, then fans out get_rent_estimate per address and ranks by the gap between asking rent and estimated rent — chaining tools across the API in a way the dashboard doesn't.

Development

npm run build   # compile TypeScript → dist/
npm run dev     # tsc --watch
npm start       # run the built server on stdio

Layout: src/rentcastClient.ts is the single HTTP/auth/error layer; each tool lives in its own file under src/tools/; src/index.ts registers them and opens the stdio transport. For local testing outside Claude Desktop, copy .env.example to .env and run RENTCAST_API_KEY=... npm start.

Unofficial — built to show what an official RentCast MCP server could look like. Want it official — OAuth, full tool set, maintained under your name? Hasan Khadra · hk@hasankhadra.me · hasankhadra.me/mcp

License

MIT