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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.

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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 on Base mainnet. No accounts, no subscriptions, no dashboards.

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What’s included

14 Data Sources

Property valuation, flood risk, walkability, census demographics, environmental hazards, broadband, jobs, disasters and more — all in one call.

5 Investor Engines

Fix & Flip, Co-Living, Subject-To, STR, and BRRRR — with real financial projections and hidden cost discovery.

AI Narrative

Claude Sonnet generates a full investment analysis, risk assessment, and recommendation in natural language.

MCP Ready

Native MCP discovery schema at /.well-known/mcp — works with Claude Desktop, Cursor, and any MCP-compatible agent.

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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

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Base URL

https://propx402.xyz

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Payment receiver

All payments settle directly to this address on Base mainnet: 
0xCFA4F055621356974dFA4846a6e0047f593C4dDA
Built by Big Bang Interactive LLC · Cedar Rapids, Iowa · Powered by the x402 open payment protocol.