{"uid":"cap_3D3MlLCLC8GUyPYM9SfYh","slug":"agentshelf-syntexa-ch-blake2b-512-digest-of-hex-bytes-base64-807d7d2c","name":"agentshelf.syntexa.ch BLAKE2b-512 Digest of Hex Bytes (Base64)","description":"Call when an agent needs a blake2b512 digest of hex bytes, encoded as base64. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64-rawhex first.","url":"https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64-rawhex?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"key":{"type":"string","maxLength":512,"minLength":1,"description":"HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored."},"text":{"type":"string","examples":["68656c6c6f"],"maxLength":100000,"minLength":1,"description":"Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.008","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.008/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_M0RSOrAOwIfwqc_k1LeC2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.008","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes a BLAKE2b-512 cryptographic hash of raw bytes supplied as a hex-encoded string, returning the digest encoded as standard Base64.","exampleAgentPrompt":"Can you compute the BLAKE2b-512 hash of this hex string — 'deadbeef0102030405' — and give me the result as Base64?","exampleUseCases":[{"title":"Verify integrity of binary file chunk","prompt":"I have a binary chunk represented as hex bytes — '4a6f686e446f65' — can you run BLAKE2b-512 on it and give me the Base64 digest so I can compare against my expected checksum?"},{"title":"Keyed MAC for raw binary data","prompt":"Generate a keyed BLAKE2b-512 MAC in Base64 for the hex string 'cafebabe1234abcd', using the key 'mysecretkey123'."},{"title":"Hash raw protocol frame bytes","prompt":"My network protocol frame is stored as a hex dump — 'ff00ff00aabbccdd' — please compute its BLAKE2b-512 hash encoded in Base64 so I can log it as a fingerprint."}],"resultDescription":"Returns a Base64-encoded string representing the 512-bit BLAKE2b digest of the raw bytes decoded from the input hex string. If a key is provided, the digest is computed as a keyed BLAKE2b-512 MAC.","failureModes":["Invalid hex string (odd length or non-hex characters) causes a 400 error","Input text exceeds 100,000 character limit returns a payload-too-large error","Key exceeds 512-character limit returns a validation error","Malformed JSON body returns a 400 bad request","Insufficient USDC balance or payment failure returns a 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when your input data is already represented as a hex-encoded byte string (e.g. raw binary frames, file chunks, protocol payloads) and you need a BLAKE2b-512 digest in standard Base64 format. Use the sibling text-input endpoints instead if your input is plain UTF-8 text rather than hex bytes. Prefer the sandbox (unpaid) version for testing before committing to the $0.008 USDC cost.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T00:46:11.883Z","isFirstParty":false,"canonicalSlug":"agentshelf-syntexa-ch-blake2b-512-digest-of-hex-bytes-base64-807d7d2c"}