Practical guide to building policy-safe on-chain AI trading agents: off-chain LLM/RL planners, a guarded DEX swap "pair scout" use case, Solidity tool + policy contracts, and a Hardhat/Base Sepolia deployment you can run yourself.
Hands-on look at Solidity in 2025 from a builder’s perspective: how production teams actually write and audit contracts, manage gas and L2s, and where alternatives like Vyper and Rust realistically fit.