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Altos

Weekly U.S. real-estate market statistics by region, property type, and price quartile through MCP.

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Install Altos

Pick your client, then add it in one click or paste the config.

STDIONode.js
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "altos": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-altos"
      ]
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Install not yet sandbox-tested— we haven't run this command through our automated sandbox yet. Not a red flag; we're working through the catalog.

Overview

The Altos MCP server exposes weekly Altos Research housing statistics through the Pipeworx gateway or a local stdio package. Its primary tool, altos_market_stats, queries median list prices, price reductions, days on market, and inventory by national, state, metro, or ZIP region, with property-type and quartile filters. Use it for current market-temperature analysis when weekly listing data is more suitable than slower public housing datasets.

Use cases

  • Compare weekly inventory across peer metropolitan areas
  • Assess listing conditions by property type
  • Track entry-level and luxury market segments
  • Generate a current housing market brief
  • Inspect ZIP-level listing trends

Key features

  • Weekly U.S. housing market statistics
  • National, state, metro, and ZIP region queries
  • Single-family and condo filters
  • Four market-quartile filters
  • Pipeworx gateway and local stdio access
  • HTTP tool invocation

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked 2d ago

Recent health check succeeded.

8/8 checks healthy over the last 45d

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

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Scanned 15d ago via OSV.dev · @pipeworx/mcp-altos (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads408Package downloads in the last 30 days.
Last commit4d agoMost recent push to the default branch.

How Altos works

What Altos does

The Altos MCP server provides access to weekly U.S. real-estate market data from Altos Research. It focuses on active listing conditions rather than completed-sale prices, including median list price, price reductions, days on market, inventory, and weekly movement. Results can be requested for the national market, a state, a metropolitan area, or a ZIP code.

The data is useful for questions such as whether a market is becoming more competitive, how quickly listings are moving, and how inventory differs between regions. It belongs in the Real Estate category and is particularly relevant to housing reports, market briefs, lender analysis, and comparisons between peer metros.

How it works

A request supplies an Altos region identifier to the altos_market_stats tool. Region codes use formats such as us_national, us-co, us-co-denver, and us-co-denver-80202. Optional filters select single_family or condo properties and one of the four market quartiles. The first quartile represents the lower-priced segment, while the fourth represents the upper-priced segment.

Altos generally publishes data weekly, usually early in the week for the preceding week. Pipeworx applies a 24-hour cache, so repeated requests during the same period may return the same values. The latest reporting period can be revised as additional listings arrive.

The Altos MCP server can run as a scoped Pipeworx endpoint or as a local package communicating over standard input and output. The gateway version also exposes shared Pipeworx tools, including natural-language routing and tool discovery. The local version exposes only the Altos pack tools.

Setup and configuration

For a remote MCP connection, configure the Pipeworx endpoint at https://gateway.pipeworx.io/altos/mcp. You can instead connect to https://gateway.pipeworx.io/mcp to access the full gateway directly. Both routes use the Pipeworx service; the scoped endpoint lists the Altos tools directly and also includes shared gateway tools.

For local use, configure an MCP client to run npx -y @pipeworx/mcp-altos. This option does not require a Pipeworx account or a gateway round trip. The package communicates over stdin and stdout and responds to MCP initialization, tool-listing, and tool-call requests.

Authentication has two supported paths. Supply an Altos partner key in the _altosKey argument when using your own commercial Altos relationship, or use the Pipeworx Housing Vertical subscription without that argument. HTTP callers can invoke the gateway tool endpoint directly with JSON.

Tools and capabilities

The primary documented pack tool is altos_market_stats. It supports:

  • Weekly market statistics for national, state, metro, and ZIP regions
  • Filtering by single-family or condominium property type
  • Filtering by first through fourth market quartile
  • Regional comparisons by making multiple requests
  • Access through MCP clients or the Pipeworx HTTP API

Gateway connections additionally provide shared tools such as ask_pipeworx, discover_tools, search_within, remember, and recall. These shared tools are not included by the standalone local package.

Limitations and notes

Altos primarily measures active listings. Its median price should not be interpreted as a completed-sale price, and sale-price changes generally come from other sources such as county-record data. Active inventory is also not the same as months of supply; calculating that measure requires a monthly sales or absorption rate.

Condominium coverage varies by market and may be unavailable in rural areas. ZIP-level results can be volatile because small listing counts produce noisier weekly changes. Quartile boundaries are recalculated weekly, so the same quartile does not necessarily represent a fixed price range over time. Treat the newest weekly value as provisional rather than using it alone for production decisions.

The Altos MCP server is an independent, unofficial integration and is not affiliated with or endorsed by Altos Research. The package is released under the MIT license.

Read the full README View source on GitHub

Reviews

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Frequently Asked Questions about Altos

Altos is an MCP server that connects AI agents to Altos Research real-estate data through Pipeworx or a local stdio package. Its main tool, altos_market_stats, retrieves weekly market statistics by region, property type, and quartile, with shared gateway tools available when using Pipeworx.

Run `npx -y @pipeworx/mcp-altos` through an MCP client for local stdio access. You can also configure the remote endpoint at `https://gateway.pipeworx.io/altos/mcp` instead of running the package locally.

Yes, Altos works with Cursor through the documented Pipeworx MCP endpoint. Add `https://gateway.pipeworx.io/altos/mcp` to Cursor's MCP configuration, or use the local `npx` stdio command.

Not always. You can provide an Altos partner key with the `_altosKey` argument, or use the Pipeworx Housing Vertical subscription without that argument. The standalone package does not require a Pipeworx account.

Altos data is published weekly, typically Monday or Tuesday for the previous week. Pipeworx caches responses for 24 hours, and the newest week may be revised as additional listings are reported.

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