The first project at IoTeX.
A full-stack SIM purchasing platform with smart contract business logic, enabling Pebble device owners to purchase IoT SIMs globally and manage top-ups and refunds.
Stack:
- Smart Contracts in Solidity — to tokenize SIM (ERC721) and order management, payment in USDT.
- The Graph — subgraphs to retrieve data.
- NextJS — backend, frontend.
Over few years several hundreds of SIM cards were purchased and distributed globally. All data fully on-chain, the user addresses were not stored.
Links
All links were last accessed on 26.02.2026.