Generate SHA-2, SHA-3, MD5 or xxh128 hashes (JSON body)

Hash text: sha256, sha512, sha384, sha1, md5, sha3-256, sha3-512, crc32b, xxh128 (or all at once). No account or API key. Without PAYMENT-SIGNATURE the response is HTTP 402 with an x402 v2 payment challenge; pay and resend the identical request. Input as query string (GET) or JSON body (POST), max 64 KB; the payment is bound to the exact input. Price: 0.002 USDC per call.