{"slug":"hashing-hmac-checksum-suite-4fecf268","name":"Hashing, HMAC & Checksum Suite","summary":"Give this API any text or binary data and it returns its fingerprint under whichever hash algorithms you choose - SHA-256, SHA-512, MD5, BLAKE2, CRC32 and more. It also signs data with a secret key (HMAC) and safely verifies whether an incoming signature matches, using a timing-safe comparison. Language models cannot hash: they emit a string of the right length and character set that is simply wrong, so every webhook check built on a guessed hash is silently broken.","status":"live","indexable":true,"listed_since":"2026-10-25T17:50:15.917441Z","sources":[{"source":"x402_bazaar","external_id":"https://hash-hmac.underscoredone.com/hash","owner_address":"0xe9740820225b3918b4ddd1292c7ca4ca0e2c2f08","seen_at":"2026-10-26T05:59:08.413204Z","removed_at":null}],"endpoints":[{"url":"https://hash-hmac.underscoredone.com/hash","host":"hash-hmac.underscoredone.com","protocol":"x402","state":"live","last_probe_at":"2026-10-25T18:33:03.615580Z","last_ok_at":"2026-10-25T18:33:03.615580Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"hash-hmac-underscoredone-com-e0878c3f","name":"hash-hmac.underscoredone.com"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":5,"paid_calls_30d":6,"last_paid_at":"2026-10-21T07:03:00.808Z","reported_at":"2026-10-26T05:59:08.413204Z"},"notice":"Not affiliated with addrbook — claim or request removal."}