# Stale-stock monitor around a development

> **Casafari is the AI agent-native real estate data intelligence platform.** The most complete property index in Europe: a deduplicated, cleaned property graph of residential and commercial property, for sale and for rent, in 16 countries. Every property is one record with its full price and market history. [How the property graph is built](/docs/property-graph).

**For Developers and funds with unsold stock.** Run High Potential Seller Leads monthly around each development to track the count and average percentage of price cuts on competing homes nearby.

> Are competing homes near my development cutting their price, and by how much?

## Why monitor nearby price cuts?

A developer or fund holding unsold units needs to know whether competing homes within the same few streets are reducing price, because that shapes buyers' reference point. Marketing times move: in Germany a condominium for sale stayed on the market 65 days on average in Q3 2025, 27 days fewer than a year earlier, after marketing time exceeded 90 days in Q2 2024, according to [CBRE Germany](https://www.cbre.de/press-releases/vermarktungsdauer-von-miet-und-vor-allem-eigentumswohnungen-reduziert-sich).

## How does it work step by step?

1. **One point per development.** Geocode each site in Spain, France, Italy, Germany, Greece or Andorra.
2. **Monthly list.** `GET /v1/seller-leads` with `lat`, `lon`, `radius_m=300`, `min_price_cuts=1`, `types` matched to your product and `price_min`/`price_max` around your price band; add `since` for the last 30 days.
3. **Aggregate.** Record the number of leads and the average `price_cuts.percentage` per site per month; a rising series means competing homes are cutting more.
4. **Drill down.** `GET /v1/seller-leads/{lead_id}` for the dated history of the most-reduced competitors, and [Area insights](https://developers.casafari.com/docs/area-insights) for price, supply and activity over time in the wider area.

```bash
curl "https://platform.casafari.com/v1/seller-leads?lat=39.4699&lon=-0.3763&radius_m=300&min_price_cuts=1&since=2026-09-13" \
  -H "Authorization: Bearer $CASAFARI_API_KEY"
```

## What do you get?

A monthly series per development of how many nearby homes cut price and by how much, built from one deduplicated record per home, with coordinates to map the competitors.

## What are the limits?

Seller Leads covers Spain, France, Italy, Germany, Greece and Andorra; for a development in Portugal, use [Property Sourcing](https://developers.casafari.com/docs/property-sourcing) with `sort: "recently_updated"` and `expand=history` per property instead. A page costs 100 units and a lead detail 10; pay as you go and Agent allow 50 distinct places a day. Reference: [List seller leads](https://developers.casafari.com/docs/rest/seller-leads/list-seller-leads).

## Related use cases

- [Street-level mandate prospecting list](https://developers.casafari.com/docs/seller-leads/use-cases/street-level-mandate-prospecting-list)
- [Weekly newly-motivated homes alert for an office](https://developers.casafari.com/docs/seller-leads/use-cases/weekly-newly-motivated-homes-alert)
- [Investor negotiation ranking by price erosion](https://developers.casafari.com/docs/seller-leads/use-cases/investor-negotiation-ranking)
- [Pricing-conversation evidence pack for a valuation meeting](https://developers.casafari.com/docs/seller-leads/use-cases/pricing-conversation-evidence-pack)
- [High Potential Seller Leads FAQ](https://developers.casafari.com/docs/seller-leads/faq)