ERC-8378 Redefines Fungible Tokens With Parametric State

Parametric Token proposes a new ERC-20 compatible standard, adding per-account state to fungible tokens. It enables deterministic parameter updates on transfer, sub-accounts, and non-zero-sum transfers. Use cases include liquidity consolidation, velocity control, derivatives, and agentic systems. Draft and implementations are on GitHub; PR #1937 is open for feedback.