{"uid":"cap_pB1QFFpzZHWW6AlUtZqur","slug":"blake2b-512-digest-as-base64url-b0847ada","name":"BLAKE2b-512 Digest as Base64URL","description":"Call when an agent needs a blake2b512 digest of text, encoded as base64url. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64url first.","url":"https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64url?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":"0.007","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":"$0.007/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_roiFxBCt6INFfeATwHrom","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.007","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 base64url, with optional keyed hashing.","exampleAgentPrompt":"Hash this string using BLAKE2b-512 and give me the result as base64url: 'Hello, world! This is my document content to fingerprint.'","exampleUseCases":[{"title":"Document integrity fingerprinting","prompt":"Can you compute a BLAKE2b-512 hash of this document text and encode it as base64url so I can store it as a tamper-evident fingerprint? The text is: 'Contract v2.3: The parties agree to the following terms...'"},{"title":"Keyed BLAKE2b MAC generation","prompt":"Generate a keyed BLAKE2b-512 digest encoded as base64url for the message 'user:42:action:purchase:amount:99.00' using the key 'my-secret-hmac-key-2024'."},{"title":"Content deduplication checksum","prompt":"I need to deduplicate a large set of text entries — can you compute a BLAKE2b-512 base64url digest of this text so I can use it as a unique content hash: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore.'"}],"resultDescription":"Returns a BLAKE2b-512 digest of the input text, base64url-encoded (no padding), suitable for use as a hash identifier, integrity checksum, or message authentication code when a key is supplied.","failureModes":["Text or key exceeds maximum length (100,000 or 512 characters respectively) — returns 400 validation error","Empty text or key provided — returns 400 validation error","Payment not included or insufficient — returns 402 Payment Required","Service unavailable — returns 5xx error"],"whenToPreferThis":"Choose this endpoint when you need a BLAKE2b-512 hash specifically encoded as base64url (URL-safe, no padding) rather than hex or plain base64. Prefer the free sandbox variant (/v1/sandbox/digest-blake2b512-base64url) for testing. Use over SHA variants when you need the speed and security properties of BLAKE2b, and over blake2s256 when you need the full 512-bit output length.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T06:46:39.431Z","isFirstParty":false,"canonicalSlug":"blake2b-512-digest-as-base64url-b0847ada"}