Aleph Hackathon

The problem

Rural farmers protect real, verifiable environmental impact — but are unbanked, with no way to get paid for it. Companies need verifiable proof of that impact for ESG reporting and marketing, not paper certificates that risk being called out as greenwashing.

The solution

AgroRoot connects both sides. A farmer sends a geotagged photo of their land over Telegram — no app to install, no registration, no password. This creates a Verified Impact Point (PIV) that appears instantly in a company dashboard. The company buys it for 25 USDT, seeing the exact network fee in USDT before confirming. The payment lands directly in the farmer's wallet, and the bot confirms it on Telegram with the transaction receipt.

The farmer never touches ETH, never buys crypto, and never pays a network fee — a paymaster covers it, and the fee is settled in USDT.

WDK integration

Module: @tetherto/wdk-wallet-evm-erc-4337 Network: Sepolia Paymaster/Bundler: Candide A smart account (ERC-4337) is created automatically for each farmer on their first interaction Before the company confirms payment, the dashboard shows the live gas fee quote in USDT The transaction is executed as a sponsored UserOperation, with the fee settled in USDT instead of native gas

Stack

Blockchain: WDK (Wallet Development Kit) by Tether, Sepolia testnet Backend: Node.js + Express, SQLite Messaging: Telegram bot (built for hackathon speed; the messaging layer is isolated, so migrating to WhatsApp Business API in production is a contained change) Frontend: Plain HTML, CSS, and JavaScript

Track

Built for the WDK Gasless track (Tether) — demonstrating zero-to-first-payment onboarding: a user with an empty wallet receives USDT and can use it immediately, with the fee quote shown before signing.