> ## Documentation Index
> Fetch the complete documentation index at: https://docs.propx402.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Real estate property intelligence API for autonomous AI agents

<Note>
  **No API keys required.** PropX402 uses the x402 payment protocol — agents pay per query in USDC on Base. Start with free `/test/*` endpoints to explore without a wallet.
</Note>

## What is PropX402?

PropX402 aggregates **14 government and public data sources** into a single structured JSON response — delivered in 3–8 seconds. Payments happen natively via the [x402 protocol](/x402-protocol) on Base mainnet. No accounts, no subscriptions, no dashboards.

## What's included

<CardGroup cols={2}>
  <Card title="14 Data Sources" icon="database">
    Property valuation, flood risk, walkability, census demographics, environmental hazards, broadband, jobs, disasters and more — all in one call.
  </Card>

  <Card title="5 Investor Engines" icon="chart-line">
    Fix & Flip, Co-Living, Subject-To, STR, and BRRRR — with real financial projections and hidden cost discovery.
  </Card>

  <Card title="AI Narrative" icon="sparkles">
    Claude Sonnet generates a full investment analysis, risk assessment, and recommendation in natural language.
  </Card>

  <Card title="MCP Ready" icon="robot">
    Native MCP discovery schema at `/.well-known/mcp` — works with Claude Desktop, Cursor, and any MCP-compatible agent.
  </Card>
</CardGroup>

## Who is it for?

* **AI real estate agents** — structured property data without scraping or manual lookups
* **Investor tools** — run deal analysis at scale across any US address
* **Autonomous agents** — ElizaOS, GOAT, LangChain, or any x402-enabled framework
* **MCP clients** — Claude Desktop, Cursor, or any MCP-compatible tool

## Base URL

```
https://propx402.xyz
```

## Payment receiver

All payments settle directly to this address on Base mainnet:

```
0xCFA4F055621356974dFA4846a6e0047f593C4dDA
```

<Info>
  Built by **Big Bang Interactive LLC** · Cedar Rapids, Iowa · Powered by the x402 open payment protocol.
</Info>