{"uid":"cap_bR5KS4mwtl_W6DrUCPGDn","slug":"agentshelf-syntexa-ch-blake2b-512-hex-digest-538ce6ff","name":"agentshelf.syntexa.ch BLAKE2b-512 Hex Digest","description":"Call when an agent needs a blake2b512 digest of text, encoded as hex. No network and no LLM. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-hex first.","url":"https://agentshelf.syntexa.ch/v1/digest-blake2b512-hex?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":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_lSHFNXFUh1cPo_wE6f-wn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","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 as a lowercase hexadecimal string.","exampleAgentPrompt":"Can you compute the BLAKE2b-512 hex hash of the text 'Hello, world!' — no key needed?","exampleUseCases":[{"title":"Integrity fingerprint for audit log","prompt":"Hash the string 'user=alice action=delete resource=invoice-4821 timestamp=2024-06-01T12:00:00Z' with BLAKE2b-512 and give me the hex digest so I can store it as a tamper-evident fingerprint."},{"title":"Keyed MAC for API payload signing","prompt":"I need a keyed BLAKE2b-512 hex digest of the payload 'amount=500&currency=USD&recipient=bob' using the key 'mysecretkey42' — can you compute that for me?"},{"title":"Deduplication hash for document store","prompt":"Generate a BLAKE2b-512 hex hash of this document text so I can check whether it's already stored: 'The quick brown fox jumps over the lazy dog. This is a test document for deduplication.'"}],"resultDescription":"Returns a 128-character lowercase hexadecimal string representing the BLAKE2b-512 digest of the input text. If a key is provided, the result is a keyed (MAC-style) hash. The computation is performed entirely server-side with no external network calls or LLM inference.","failureModes":["Empty or missing 'text' field returns a validation error","Key length exceeds 512 characters returns a validation error","Text exceeds 100,000 characters returns a size limit error","Malformed JSON body returns a 400 error","Payment failure or insufficient USDC balance returns a 402 error"],"whenToPreferThis":"Choose this endpoint when you need a BLAKE2b-512 hash specifically encoded as hexadecimal (e.g. for storage in hex columns, comparison with other hex hashes, or tooling that expects hex). Prefer the free sandbox endpoint POST /v1/sandbox/digest-blake2b512-hex first for testing. Use the base64url sibling endpoint if you need a more compact encoding. Choose BLAKE2b-512 over MD5 or SHA-224 when you need a stronger, collision-resistant hash with optional keying (MAC) capability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T06:47:38.633Z","isFirstParty":false,"canonicalSlug":"agentshelf-syntexa-ch-blake2b-512-hex-digest-538ce6ff"}