Last-minute cancellations? We turn them into opportunities you can book in 30 seconds.

We recover free slots from padel, football and tennis courts, offer them at a discount to nearby users via WhatsApp, and handle payment with an anti-competition lock.

Matching latency: < 30s SLA

Matched users: —

// Partner Panel

Admin Simulator

LIVE · Milano

45.478°N · 9.124°E

Send webhook CANCELLATION → San Siro Padel Club

// User Simulator

WhatsApp Live

SlotSaver

business account · online

Waiting for a free slot…
Press the red button to simulate.

// Submission · Fabrizio Romano x Emergent Builder's Contest

We turn cancellations into last-minute revenue.

SlotSaver is an autonomous, event-driven, agent-based marketplace that monetizes slots freed at the last minute by padel, football, tennis courts and wellness centers.

+€18,000

Value per club

Average yearly recovery per sports center on otherwise-lost slots. SlotSaver keeps only 15%, the other 85% goes to the club.

< 30 sec

Booking speed

From the cancellation webhook (T0) to the interactive WhatsApp notification in under 30 seconds. Book in a single tap.

0 conflicts

Anti-double-booking

Atomic lock on MongoDB (find_one_and_update VACANT→LOCK): the first “Yes” wins, everyone else gets a 409. Zero race conditions.

4 autonomous agents architecture

AGENT 01

Calendar Monitor

Ingestion

Receives the CANCELLATION webhook, computes the discount and creates the VACANT slot.

AGENT 02

Matching & Optimization

Intelligence

Geo query (ST_DWithin) + category, scoring into Premium/Standard buckets.

AGENT 03

Communication

Engagement

Interactive WhatsApp delivery, 45s TTL, atomic lock on the first Yes.

AGENT 04

Transaction & Escrow

Financial

Stripe Connect capture, 15% commission, 85% payout, QR receipt.

Made with Emergent