LIVE ON BASE · x402 PROTOCOL · AI-NATIVE

Property intel
for AI agents
that can't wait.

PropX402 is the real estate intelligence API built for autonomous AI agents. No API keys. No accounts. No subscriptions. Hit an endpoint, pay $0.05 USDC via x402, get a complete property report in milliseconds.

▶ Try Free Demo API Status MCP Schema
real-estate-agent.js
// AI agent queries PropX402 — pays via x402, gets full property intel const response = await fetch('https://propx402.xyz/property-intel', { method: 'POST', body: JSON.stringify({ address: '1234 Oak St, Cedar Rapids, IA' }) }); // → HTTP 402: Payment Required ($0.05 USDC on Base) // → Agent auto-pays via x402 wallet // → HTTP 200: Property Intelligence Report { "property": { "yearBuilt": 1987, "sqft": 1840, "beds": 3, "baths": 2 }, "valueEstimate": { "value": $218500, "low": $204000, "high": $233000 }, "rentEstimate": { "monthly": $1650, "capRate": "~9.1%" }, "floodRisk": { "zone": "X", "risk": "Minimal" }, "walkScore": 72, "schoolScore": 8.1, "neighborhood": { "medianIncome": "$61,200", "trajectory": "appreciating" }, "riskScore": 18, "riskLabel": "Low" }
// HOW IT WORKS

Three steps.
Zero friction.

PropX402 implements the x402 payment protocol. AI agents discover the endpoint, pay per query in USDC on Base, and receive structured property intelligence. No accounts, no API keys, no human in the loop.

01
Agent Requests
Your AI agent sends a POST to /property-intel with an address. No auth header needed.
02
HTTP 402 → Pay
PropX402 returns 402 Payment Required with USDC amount and Base network address. Agent auto-pays $0.05 USDC via x402 wallet.
03
Get Intel
Payment verified on Base. Structured JSON returned instantly: property data, AVM, flood risk, walkability, neighborhood demographics, risk score.
04
Upgrade: Narrative
Pay $0.10 USDC for /property-narrative — Claude Sonnet 4.6 writes a full investment analysis, risk assessment, and agent recommendation.
// PRICING

Pay per query.
Never subscribe.

All payments settled instantly in USDC on Base. No billing cycles. No minimums. No chargebacks. Agents pay exactly for what they use.

Endpoint Price What you get
/health FREE API status, endpoint directory, version info
/test/* FREE All endpoints mirrored for dev testing — no wallet needed
/property-intel $0.05 14-source property intelligence — AVM, rent, flood, walkability, demographics, hazards, broadband, jobs, disasters
/property-investor $0.15 5 investor strategy engines — Fix & Flip, Co-Living, Subject-To, STR, BRRRR + hidden costs + regulatory intel
/property-narrative $0.10 Claude Sonnet AI narrative — investment analysis, risk assessment, recommendation in natural language
/property-full $0.25 Everything — intel + investor analysis + AI narrative in one call. Best value for full due diligence.
/property-bulk $0.03/ea Up to 20 addresses per call — parallel processing for portfolio screening

All payments in USDC on Base · Instant settlement · No minimums · No chargebacks · Full docs →

// DATA SOURCES

Best-in-class data.
Aggregated for agents.

PropX402 aggregates 14 authoritative sources in parallel and returns a single normalized JSON payload in under 8 seconds. No scraping. No brokers. All official government and public APIs.

RentCast
140M+ property records. AVM, rent estimates, comparables, last sale data.
API Key
FEMA Flood Maps
Official flood zone designation. Risk level, FIRM panel ID.
Free
US Census ACS
Neighborhood demographics. Income, home values, vacancy rate.
Free
OSM Overpass
Real amenity-based walkability — POI count within 800m radius.
Free
EPA EJSCREEN
Environmental risk. Air quality percentile, superfund proximity.
Free
USGS NEHRP 2020
Earthquake hazard — peak ground acceleration at property coordinates.
Free
NOAA Severe Weather
Tornado and hail risk by state — feeds insurance estimates.
Free
FCC Broadband Map
Internet availability — gigabit, fiber, max speeds, provider count.
Free
HUD Opportunity Zones
Federal OZ designation — capital gains tax advantage flag.
Free
HUD Fair Market Rent
County FMR benchmarks — studio through 4BR.
Free
FRED (St. Louis Fed)
State housing price index — YoY appreciation trend.
API Key
BLS
State unemployment rate and trend — rental demand signal.
Free
OpenFEMA
Federal disaster history by county — floods, storms, declarations.
Free
OpenStreetMap
Geocoding and address normalization. Zero cost, global coverage.
Free

View full data source documentation →

// LIVE DEMO

Try the free
health endpoint.

Test the API discovery endpoint for free. Production property intel queries require $0.05 USDC via x402.

GET /health — Free API discovery (no payment required)
GET /.well-known/mcp — MCP Tool Schema (for LLM agent discovery)