LotterySweepstakes (Weekly VRF Draw)

Overview

LotterySweepstakes is a recurring lottery with proportional-ticket weighting. Players buy tickets at ticketPrice ETH each; more tickets = higher draw weight. On schedule, AutoLoop uses ECVRF to pick one winner proportionally, transfers the prize pool (minus fees), and resets for the next round.

Why AutoLoop + VRF Are Structurally Required

Inverted interest — identical to CrumbleCore but financial. With a deterministic draw, the trigger holder knows who wins before calling. They can hold the trigger until they've bought the winning block position, or sandwitch the call. More fundamentally: if the prize pool is large enough, nobody wants to trigger the draw for free — free-rider failure means the loop self-stalls without a neutral keeper.

Mechanics

• Enter: buyTickets(count) at ticketPrice × count ETH. Calling again adds more tickets to the same address
• shouldProgressLoop: returns true when entrantCount > 0 and roundInterval has elapsed since last draw
• Winner selection: VRF-seeded linear scan through cumulative ticket weights picks one winner
• Settlement: 3% protocol fee; prize = pool - fee transferred to winner. Round recorded in rounds[roundId]
• Reset: all ticket counts and the entrants list are cleared after each draw — fresh start every round

Revenue Model

• 3% protocol fee on each prize pool
• AutoLoop gas fee per draw tick

Deploy

forge create src/agents/LotterySweepstakes.sol:LotterySweepstakes \
  --constructor-args 10000000000000000 604800 \
  --rpc-url $RPC_URL --private-key $PRIVATE_KEY --broadcast

Args: ticketPrice (wei), roundInterval (seconds). A 0.01 ETH ticket price and 7-day interval (604800) is typical.

Dashboard

View LotterySweepstakes on the AutoLoop Dashboard.