A $100 hat showed up at my door in Kyoto. I paid nothing for it — not for the hat, not for shipping. $0.00. It wasn't a coupon I found or a sale. The store, humanrequired.shop , only gives that discount to AI agents that can prove a real human is standing behind them . So I made my agent prove it, on-chain, with a zero-knowledge proof. The discount it got back was 100% off. Here's the whole path, because the design held together far better than I expected. TL;DR World Foundation's AgentKit lets you prove on-chain that an agent is "human-backed." humanrequired.shop hands a human-only 100%-off discount to verified agents — once per World ID. The official Claude Code plugin ( worldcoin/agentkit-shopify-demo ) ships the whole flow as skills. Result: one "Human in the Loop" Hat, $100 → $0, shipping included , delivered to Japan.…