x402 Agent Spending Guard: Give Your Agent a Budget Before You Give It a Wallet

x402 Agent Spending Guard: Give Your Agent a Budget Before You Give It a Wallet On September 30, 2026, x402-seatbelt shipped — a free, open-source, zero-dependency npm package (plus a Python version, agentseatbelt on PyPI) that checks every x402 payment before it leaves your machine: budget cap,…