REST API for Japanese seasonal data. 57 JMA stations, 73 years of cherry blossom records, real-time autumn foliage tracking, and 200+ curated festivals with GPS coordinates. MCP server included — works with Claude, GPT, and any MCP-compatible AI agent out of the box. First API to support x402 protocol: AI agents pay per request with USDC on Base. No API key needed. HTTP 402 tells the price, agent pays, data flows back. Free (100 req/day) · Pro $9.99/mo · Pay-as-you-go $0.001/req · x402 USDC