{"uid":"cap_lpy5xu7__oatWb0qHimks","slug":"blake2b-512-digest-as-base64-79bd69fd","name":"BLAKE2b-512 Digest as Base64","description":"Call when an agent needs a blake2b512 digest of text, encoded as base64. No network and no LLM. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64 first.","url":"https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64?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":["hello"],"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":"0.006","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":"$0.006/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_OM6W0XiA_v0Fk5kxc8rt8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","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 input text and returns it encoded as Base64, with optional HMAC keying.","exampleAgentPrompt":"Can you hash the text 'Hello, world!' using BLAKE2b-512 and give me the result as a base64 string?","exampleUseCases":[{"title":"Integrity check for stored content","prompt":"Hash this document text using BLAKE2b-512 and give me the base64 digest so I can store it alongside the record to detect tampering later: 'User agreement v3.2 signed on 2024-01-15.'"},{"title":"Keyed MAC for API message signing","prompt":"I need a keyed BLAKE2b-512 MAC for the message 'order_id=9821&amount=50.00&currency=USD' using the key 'my-secret-key-abc123' — return it as base64."},{"title":"Deduplication fingerprint for text pipeline","prompt":"Compute a BLAKE2b-512 base64 fingerprint of this article snippet so I can check if I've seen it before: 'Scientists discover new species of deep-sea jellyfish off the coast of Japan.'"}],"resultDescription":"A JSON response containing the BLAKE2b-512 digest of the submitted text, encoded as a standard Base64 string. No network calls or LLM inference are involved; the result is deterministic and reproducible given the same inputs.","failureModes":["Empty or missing 'text' field returns a validation error","Key exceeding 512 characters triggers a schema validation rejection","Text exceeding 100,000 characters is rejected with an input size error","Payment failure or insufficient USDC balance results in a 402 response","Malformed JSON body returns a 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need a BLAKE2b-512 hash encoded specifically as standard Base64 (not hex, base32, or base64url). It is fully deterministic, requires no network access or LLM, and supports optional keyed HMAC-style digests. Prefer the free sandbox endpoint (/v1/sandbox/digest-blake2b512-base64) for testing; use this paid endpoint for production workloads requiring the stronger BLAKE2b-512 algorithm over MD5, RIPEMD-160, or BLAKE2s-256.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:48:47.402Z","isFirstParty":false,"canonicalSlug":"blake2b-512-digest-as-base64-79bd69fd"}