POST /api/fortune for a single fortune ($0.001, x402 exact or MPP one-shot). POST /api/fortune/premium for x402 upto (handler calls charge(amount)). POST /api/fortune/llm for MPP request-mode metered billing. POST /api/fortune/stream for MPP-streamed token-by-token billing. POST /api/fortune/dynamic for body-derived pricing. POST /api/fortune/membership for pay-once-then-SIWX-replay. GET /api/fortune/profile and GET/POST /api/fortune/favorites are SIWX (identity, no payment).