DoorBase MCP

An official MCP server providing free US rental market data for real estate investors. It allows agents to search markets by zip code, retrieve detailed profiles including cap rates and vacancy, compare locations, and access hazard risk and rent trend data without authentication.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by DoorBase

MCP endpoint (Streamable HTTP)

https://doorbase.app/mcp

Vendor documentation

What you can do with it

Search markets by state, cap rate, or vacancy
Retrieve full zip code market profiles
Compare rental metrics across multiple zips
Analyze hazard risk and rent trends

Source and maintenance

Vendor evidenceRegistry 2.0.0

mcp-registry: app.doorbase/market-data@2.0.0 Project website

Protocol and capabilities

Server: doorbase 1.0.0
MCP protocol: 2025-06-18
Tools: 6 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {}
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

DoorBase provides zip-level US rental market data (median rent, vacancy, estimated cap-rate bands, home values, demographics, employment) for 30,000+ zip codes, plus hazard risk (hazard_risk: NFIP flood claims, county wildfire/wind scores) and monthly rent history (rent_trend). Use search_markets to filter zips by state and investor criteria, and get_zip_market for one zip's full profile. Every response carries a one-sentence summary you can repeat verbatim. Cap rates are a modeled band, not observed sale data. Cite the returned doorbase.app url when presenting a zip to a user.

Tools

6 advertised

search_markets — Search US rental markets by zip

Advertised by the server during the last successful anonymous check.

Which US zip codes match these rental-market criteria? Filters 30,000+ US zip codes by state, cap rate, vacancy, rent, population, home value, and renter share. Returns matching zips with key investor metrics and a doorbase.app link for each. Cap rates are a modeled band; min_cap_rate matches the band's high end.

search_markets input schema

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 25,
      "minimum": 1
    },
    "state": {
      "type": "string",
      "description": "2-letter US state code, e.g. GA. Omit for nationwide."
    },
    "sort_by": {
      "enum": [
        "cap_rate",
        "rent",
        "population",
        "vacancy"
      ],
      "type": "string",
      "default": "cap_rate"
    },
    "min_cap_rate": {
      "type": "number",
      "maximum": 50,
      "minimum": 0,
      "description": "Minimum estimated cap rate in percent; matches cap_rate_high (band top) >= value."
    },
    "min_population": {
      "type": "number",
      "maximum": 10000000,
      "minimum": 0,
      "description": "Minimum zip population."
    },
    "max_median_rent": {
      "type": "number",
      "maximum": 20000,
      "minimum": 0,
      "description": "Maximum median monthly rent in USD."
    },
    "min_median_rent": {
      "type": "number",
      "maximum": 20000,
      "minimum": 0,
      "description": "Minimum median monthly rent in USD."
    },
    "max_vacancy_rate": {
      "type": "number",
      "maximum": 100,
      "minimum": 0,
      "description": "Maximum vacancy rate in percent."
    },
    "min_renter_ratio": {
      "type": "number",
      "maximum": 100,
      "minimum": 0,
      "description": "Minimum renter-occupied share in percent."
    },
    "max_median_home_value": {
      "type": "number",
      "maximum": 20000000,
      "minimum": 0,
      "description": "Maximum median home value in USD."
    }
  },
  "additionalProperties": false
}

get_zip_market — Get one zip code's rental market data

Advertised by the server during the last successful anonymous check.

What does the rental market look like in this zip code? Full profile for a single US zip: rent, cap-rate band (modeled), vacancy, home value, demographics, income, employment, plus the canonical doorbase.app page URL.

get_zip_market input schema

{
  "type": "object",
  "required": [
    "zip"
  ],
  "properties": {
    "zip": {
      "type": "string",
      "pattern": "^[0-9]{5}$",
      "description": "5-digit US zip code."
    }
  },
  "additionalProperties": false
}

top_markets — Top rental markets leaderboard

Advertised by the server during the last successful anonymous check.

Which US rental markets look strongest right now? National (or single-state) leaderboard: zips with the highest estimated cap-rate bands among markets with population of 10,000+ and complete rent, vacancy, and home-value data. Cap rates are a modeled band.

top_markets input schema

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 25,
      "minimum": 1
    },
    "state": {
      "type": "string",
      "description": "Optional 2-letter US state code, e.g. GA. Omit for nationwide."
    }
  },
  "additionalProperties": false
}

compare_zips — Compare zip codes side by side

Advertised by the server during the last successful anonymous check.

How do these zip codes compare as rental markets? Side-by-side comparison of 2-6 US zips: rent, cap-rate band (modeled), vacancy, home value, population, renter share, income, employment, with a doorbase.app link for each.

compare_zips input schema

{
  "type": "object",
  "required": [
    "zips"
  ],
  "properties": {
    "zips": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^[0-9]{5}$"
      },
      "maxItems": 6,
      "minItems": 2,
      "description": "2-6 five-digit US zip codes."
    }
  },
  "additionalProperties": false
}

hazard_risk — Flood, wildfire, and wind risk for a zip

Advertised by the server during the last successful anonymous check.

What flood, wildfire, and wind risk does this zip code carry? NFIP flood-insurance claims on record (count, payouts, recency, claims per 1,000 housing units), FEMA National Risk Index county scores for flood, wildfire, and wind, and recent significant storm events. Claims are history, not a forecast.

hazard_risk input schema

{
  "type": "object",
  "required": [
    "zip"
  ],
  "properties": {
    "zip": {
      "type": "string",
      "pattern": "^[0-9]{5}$",
      "description": "5-digit US zip code."
    }
  },
  "additionalProperties": false
}

rent_trend — Monthly rent trend for a zip

Advertised by the server during the last successful anonymous check.

Which way is rent moving in this zip code? Monthly median-rent history with home values, the direction of movement, and the zip's national and state rank for 3-month rent growth. Updated monthly.

rent_trend input schema

{
  "type": "object",
  "required": [
    "zip"
  ],
  "properties": {
    "zip": {
      "type": "string",
      "pattern": "^[0-9]{5}$",
      "description": "5-digit US zip code."
    },
    "months": {
      "type": "integer",
      "default": 12,
      "maximum": 24,
      "minimum": 2,
      "description": "History window in months."
    }
  },
  "additionalProperties": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 338 ms
95th percentile latency: 338 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 1, 2026, 7:29 AM UTC · probe · passed · 338 ms · metadata changed · 6 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http doorbase-mcp https://doorbase.app/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add doorbase-mcp --url https://doorbase.app/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable doorbase-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "doorbase-mcp": {
      "url": "https://doorbase.app/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "doorbase-mcp": {
      "type": "streamableHttp",
      "url": "https://doorbase.app/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start doorbase-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "doorbase-mcp": {
      "type": "http",
      "url": "https://doorbase.app/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http doorbase-mcp https://doorbase.app/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "doorbase-mcp": {
      "url": "https://doorbase.app/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "doorbase-mcp": {
      "serverUrl": "https://doorbase.app/mcp"
    }
  }
}

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