Telegram Mini App · Signal Card Generator
Live TMA opened straight from a bot menu: pulls Binance futures data, scores 14 weighted indicators into a composite signal with entry/stop/target levels, exports a shareable PNG card. Server-side initData HMAC validation + anti-replay, deployed on Vercel.
Crowdfunding + Staking DApp — Base mainnet
4 Solidity contracts (factory pattern + independent campaigns + ERC20 + staking pool) with a 4-state on-chain state machine and a 3-role permission model. Wagmi/viem frontend, The Graph subgraph for every read, IPFS uploads via Pinata, live progress bars driven by contract events.
AMM Decentralized Exchange — Sepolia testnet
Uniswap-V2-style architecture, three contracts written from scratch: Factory (CREATE2 deterministic pairs), Pair (x*y=k, 0.3% fee, UQ112x112 TWAP oracle, flash swaps) and Router (multi-hop routes, slippage + deadline guards). Recharts price curve, The Graph indexing of trades.
Decentralized Blog — Ethereum + IPFS
No backend, no database: post metadata on-chain (UUPS upgradeable proxy), body and covers on IPFS behind a 3-gateway failover. 5-node RPC fallback with 60s timeout and auto-retry, fixed frequent transaction failures caused by unstable public RPC.