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French Undervalued Property Finder (Biens Sous-Cotés)
x402
French Undervalued Property Finder (Biens Sous-Cotés) is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-23).
Finds French real estate listings priced below the median price per square metre of nearby actual DVF sales transactions, returning the discount gap as a percentage.
Price / call$0.05
Success—
StatusUnknown
How this service works
Pay-per-call APIs for AI agents — x402 protocol, USDC on Base, no account needed.
Output
Returns a list of French property listings in the specified area whose asking price is below the median price per square metre derived from DVF (Demandes de Valeurs Foncières) actual sale transactions nearby. Each listing includes the asking price, the reference median price per sqm from real transactions, and the undervaluation gap expressed as a percentage discount.
Example use cases
Bargain hunting in a Paris arrondissement
“Show me apartments for sale in the 13th arrondissement of Paris where the asking price is below the median DVF sale price per square metre in that area, sorted by the biggest discount.”
Investment property scouting in Bordeaux
“I'm looking for investment properties in Bordeaux — find me listings that are priced below what comparable properties actually sold for recently, and tell me the percentage gap so I can prioritise the best deals.”
Relocation value check in Marseille
“We're thinking of relocating to Marseille and want to make sure we're not overpaying — can you pull up properties there where the asking price is genuinely below the local DVF transaction median?”
Technical details
Endpoint
POSThttps://api.x-402.online/v1/fr/biens-sous-cotes?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to cross-reference live French property listings against actual completed transaction data (DVF) rather than other asking prices. It is specifically useful for identifying genuine market discounts in France, for investment screening, or for buyers who want to avoid overpaying. Prefer this over generic property search APIs when the core need is value analysis grounded in real sold-price data rather than listing-to-listing comparison.
Side effects
- Area with insufficient DVF transaction data returns no results or unreliable median
- Overly broad or ambiguous geographic query may return unexpected or empty results
- DVF data lag means very recent market shifts may not be reflected in the median
- Payment failure (x402 micropayment not processed) results in 402 response and no data
- Invalid or missing required query parameters return a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"candidates": [
{
"url": "https://...",
"type": "Appartement",
"price": 243000,
"gapPct": -31,
"surface": 70,
"pricePerM2": 3307
}
],
"candidatesCount": 6,
"soldMedianPerM2": 4778
}
}Tags
x402
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