🎰 Lotero

A Provably Fair Casino for AI Agents

A provably fair, on-chain slot machine with Chainlink VRF 2.5. Designed for autonomous agents: clients pay in USDC via x402, execution is gasless.

Overview

Lotero lets users (or AI agents) bet USDC and win prizes when three matching symbols appear on the reels. The game uses Chainlink VRF 2.5 for provably fair randomness.

RTP ~93% — DOCS/RTP_MODEL.md
Max win: 30× — Bet 1 USDC, win up to 30 USDC (three BTC)
Symbols — DOGE 5×, BNB 14×, ETH 20×, BTC 30×
Referral — 1% commission on referred players' bets
Dev fee — 5% of each bet to the team

⚠️ Frontend in development — The web app in packages/frontend is incomplete. The contracts and agent are production-ready.

Related MCP server: agentshield-mcp

Smart Contract

SlotMachineV2 (Base mainnet)

Item	Value
Address	`0xC4b88e90a73fA9ec588E504255A43d4Ccb82edE9`
Token	USDC. Bet 1 USDC, win up to 30 USDC.
VRF	Chainlink VRF 2.5
Events	`SpinRequested`, `SpinResolved`

Core functions

playFor(player, referringUserAddress, amountToPlay) — Pay on behalf of another address; the player receives the round, wins, and stats.
claimPlayerEarnings(userAddress) — Claim winnings and referral earnings.
isResolved(requestId) — Check if a round has been resolved.

Agents

Lotero Agent

Stateless HTTP API that sells spins and claims as a service. Clients pay via x402 (1.1 USDC spin, 0.1 USDC claim); the agent relays playFor and claimPlayerEarnings onchain. Two-agent system: Lotero Agent (Express API) + Ops Agent (external cron calling GET /cron/health). See packages/agent/README.md.

POST /spinWith1USDC — Paid (x402). Execute spin for player.
POST /claim — Paid (x402). Claim player earnings (gasless).
GET /round?requestId=..., GET /player/:address/balances, GET /contract/health — Read-only.
GET /cron/health — Ops Agent: system status, may execute transfers and Telegram alerts.

yarn agent        # Start agent
yarn agent:dev    # Dev with watch

Documentation: DOCS/AGENT_FLOWS.md | DOCS/AGENT_API.md

For AI agents:

MCP server (lotero-mcp on npm, listed on the official Model Context Protocol registry as io.github.csacanam/lotero): exposes 5 MCP tools over stdio — spin (paid via x402), get_round, get_balances, claim and get_contract_health — built with the official MCP TypeScript SDK (@modelcontextprotocol/sdk), with an enforced session spin limit as a responsible-gambling guardrail. Install:
```
claude mcp add lotero -- npx -y lotero-mcp
```
See mcp/README.md for configuration and tool reference.
Agent skill: npx skills add csacanam/lotero-core (or read it at lotero.xyz/skill.md) — wallet setup, x402 spin/poll/claim flow, payouts, budget guardrails.
LLM index: lotero.xyz/llms.txt.

Project Structure

packages/
├── agent/         # Lotero Agent — x402 + onchain relay
├── contracts/     # Smart contracts, tests, deploy scripts
│   ├── contracts/   SlotMachine.sol, SlotMachineV2.sol
│   ├── deploy/
│   └── test/
└── frontend/      # Web app (in development)

Documentation

Doc	Description
DOCS/AGENT_FLOWS.md	Flow diagrams (cron health, spin, claim)
DOCS/AGENT_API.md	API reference, endpoints, env, constants
DOCS/DEPLOY_BASE.md	Deploy contracts to Base
DOCS/RTP_MODEL.md	RTP math and reel layout

Requirements

Quick Start

1. Install dependencies

git clone https://github.com/csacanam/lotero-core.git
cd lotero-core
yarn install

2. Run local chain

yarn chain

3. Deploy contracts (new terminal)

yarn deploy

4. Run tests

yarn contracts:test

5. Start the frontend (optional, in development)

yarn start

App runs at http://localhost:3000.

Production

For Base mainnet: see DOCS/DEPLOY_BASE.md. Contract address above. Fund the VRF subscription with LINK.

License

MIT

lotero-mcp