SHA-256 hash API (x402)

SHA-256 hash / sha256 / cryptographic hash for AI agents. Also HMAC, JWT decode, PBKDF2, UUID. Pay-per-call USDC on Base via x402.

• POST /api/v1/sha256 — SHA-256 hash — $0.001
• POST /api/v1/hash — sha256 / sha512 hash — $0.001
• POST /api/v1/hmac — hmac-sha256 / hmac-sha512 — $0.002
• POST /api/v1/base64 — encode/decode — $0.001
• POST /api/v1/jwt-decode — jwt decode — $0.002
• POST /api/v1/pbkdf2 — PBKDF2 KDF — $0.005
• POST /api/v1/uuid — UUID v4 — $0.001
• GET /api/health — free
• GET /.well-known/x402 + /llms.txt — discovery