I Built an API Gateway That AI Agents Pay For Automatically

The Problem Every developer building AI agents faces the same issue: AI agents cannot pay for APIs. They have no credit cards, no Stripe accounts, no API keys. The Solution: x402 Protocol x402 uses HTTP 402 (Payment Required) to let AI agents pay for API calls automatically in USDC. No accounts, no KYC. What I Built XiaoKe API Gateway — 7 micro-services for AI agents: Service Price POST /pdf $0.01 POST /scrape$0.02 POST /ocr $0.015 POST /review$0.03 POST /translate $0.01 POST /summarize$0.01