Blackmail

Stake USDC on a Strava goal. Do it, or pay up.

You set a goal (miles run, rides completed, total activities), a deadline, and a USDC stake. If you hit your target, you get your money back. If you miss, it goes to whoever you named — a burn address, a charity, or someone who will enjoy watching you lose.

After the deadline, a backend oracle fetches your Strava data and submits the result on-chain. If the oracle goes quiet, anyone can claim a refund after a 7-day grace period — enforced by the contract, not by trust.

How It Works

1. Connect your wallet and Strava account
2. Set your goal, deadline, stake, and penalty recipient
3. Approve USDC and create the pact — funds go into escrow on Base
4. Oracle checks Strava after deadline and calls resolve() on-chain
5. Goal met → USDC returned. Goal missed → USDC sent to penalty recipient.

Quick Start

Install dependencies

# Contracts
cd contracts && forge install

# Backend
cd backend && npm install

# Frontend
cd frontend && npm install

Configure environment

# backend/.env
STRAVA_CLIENT_ID=your_strava_client_id
STRAVA_CLIENT_SECRET=your_strava_client_secret
STRAVA_REDIRECT_URI=http://localhost:3001/api/strava/callback
FRONTEND_URL=http://localhost:3000
RPC_URL=https://mainnet.base.org
ORACLE_PRIVATE_KEY=0x...
CONTRACT_ADDRESS=0x...
DB_PATH=./pact.db
PORT=3001

# frontend/.env.local
NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID=your_walletconnect_project_id
NEXT_PUBLIC_CONTRACT_ADDRESS=0x...
NEXT_PUBLIC_API_URL=http://localhost:3001

Deploy the contract

cd contracts
ORACLE_ADDRESS=0x... forge script script/Deploy.s.sol \
  --rpc-url https://mainnet.base.org \
  --private-key 0x... \
  --broadcast --verify

Run

# Terminal 1
cd backend && npm start

# Terminal 2
cd frontend && npm run dev

Open http://localhost:3000.

What You Need

Strava API app — create one at strava.com/settings/api. Set the callback domain to your deployed backend URL. The Authorization Callback Domain field must match your STRAVA_REDIRECT_URI.

WalletConnect Project ID — free at cloud.walletconnect.com. Required for wallet connection.

Oracle wallet — a funded wallet that the backend uses to submit resolve() transactions on-chain. Needs ETH for gas. Generate one with cast wallet new.

Goal Types

Type	Unit	Example
Run Count	runs	Run 10 times
Run Distance	miles	Run 100 miles
Ride Count	rides	Ride 5 times
Ride Distance	miles	Ride 200 miles
Any Activity	activities	20 any activities

Deploying

Backend → Railway Push to GitHub, connect to Railway, add env vars. Set STRAVA_REDIRECT_URI to your Railway URL.

Frontend → Vercel Push to GitHub, connect to Vercel, add env vars. Set NEXT_PUBLIC_API_URL to your Railway backend URL.

Tech Stack

• Contract — Solidity, Foundry, deployed on Base
• Backend — Node.js, Express, SQLite, ethers.js, node-cron
• Frontend — Next.js 14 (App Router), wagmi v2, RainbowKit, Tailwind CSS
• USDC on Base — 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Testnet Deployment

Contract deployed on Base Sepolia: 0x5C19a7CAF15fE1Ed512C1fC8BbF43C63ad9b0d24