{"uid":"cap_qGX8jfeIEMpB9CLOlAhiQ","slug":"blake2b-512-hex-to-base64url-digest-agentshelf-syntexa-ch-a74ff4ba","name":"Blake2b-512 Hex-to-Base64url Digest (agentshelf.syntexa.ch)","description":"Call when an agent needs a blake2b512 digest of hex bytes, encoded as base64url. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64url-rawhex first.","url":"https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64url-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":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8W1onu4tKFlcaLPUH70vn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","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 hex-encoded bytes and returns the digest encoded as base64url","exampleAgentPrompt":"Hash this hex byte string 'deadbeef0102030405' using BLAKE2b-512 and give me the result encoded as base64url, using the key 'mysecretkey'.","exampleUseCases":[{"title":"Data integrity fingerprinting pipeline","prompt":"I have some binary data stored as hex — '4a6f686e446f65' — can you run it through BLAKE2b-512 and give me the base64url digest so I can compare it against a stored checksum?"},{"title":"Keyed MAC for API payload signing","prompt":"Generate a keyed BLAKE2b-512 hash of the hex payload 'ff00aa1122334455' using the secret key 'my-signing-key' and return it as base64url so I can attach it as a message authentication code."},{"title":"Content deduplication hash","prompt":"I want to deduplicate some raw binary chunks I have in hex format — can you hash '0102030405060708090a0b0c' with BLAKE2b-512 and return the base64url digest I can use as a unique content identifier?"}],"resultDescription":"Returns a BLAKE2b-512 digest of the provided raw hex bytes, base64url-encoded. The output is a fixed-length cryptographic hash string suitable for integrity checks, keyed MACs, or content addressing.","failureModes":["Invalid hex string input (non-hex characters) results in an error response","Key exceeds 512-character limit or is empty returns a validation error","Text input exceeds 100,000 character limit causes rejection","Malformed request body returns 4xx error","Payment failure or insufficient USDC balance prevents execution"],"whenToPreferThis":"Choose this endpoint when you specifically need a BLAKE2b-512 hash of raw binary data provided as hex, with the output encoded in base64url format. Prefer the unpaid sandbox endpoint (/v1/sandbox/digest-blake2b512-base64url-rawhex) for development and testing. Use this paid endpoint for production workloads requiring guaranteed availability. It is distinct from SHA or MD5 hashing endpoints and from endpoints that accept plain text rather than hex-encoded bytes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:50:10.446Z","isFirstParty":false,"canonicalSlug":"blake2b-512-hex-to-base64url-digest-agentshelf-syntexa-ch-a74ff4ba"}