{"uid":"cap_0kcatqx-rGcJOeNhuM6Kb","slug":"shake-128-hex-digest-7270fc88","name":"SHAKE-128 Hex Digest","description":"Call when an agent needs a shake128 digest of text, encoded as hex. No network and no LLM. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-shake128-hex first.","url":"https://agentshelf.syntexa.ch/v1/digest-shake128-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":"0.001","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_uEmc9dpsK6oTt_iWpwLTG","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 SHAKE128 (extendable-output function) digest of input text and returns the result encoded as a hexadecimal string.","exampleAgentPrompt":"Can you compute the SHAKE128 hex digest of the text 'Hello, world!' using the key 'mykey123'?","exampleUseCases":[{"title":"Data integrity fingerprinting","prompt":"I need to generate a SHAKE128 hex digest of this JSON payload text so I can verify it hasn't been tampered with — the text is '{\"user\":\"alice\",\"action\":\"transfer\"}' and the key is 'integrity-check'."},{"title":"Deduplication key generation","prompt":"Hash this document content using SHAKE128 and give me the hex output so I can use it as a deduplication key — the text is 'Invoice #4521 for $200 dated 2024-06-01' and the key is 'dedup'."},{"title":"Audit log content addressing","prompt":"Compute a SHAKE128 hex digest for this audit log entry 'user=bob event=login ts=1717200000' with key 'auditlog' so I can store it as a content-addressed identifier."}],"resultDescription":"Returns a hexadecimal string representing the SHAKE128 (XOF) digest of the provided input text. The output length is determined by the key parameter. No network calls or LLM inference are involved — the computation is purely deterministic and local.","failureModes":["Empty or missing text/key fields return a validation error","Text exceeding 100,000 characters is rejected","Key exceeding 512 characters is rejected","Payment not provided or insufficient USDC results in HTTP 402 Payment Required","Malformed JSON body returns 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need a SHAKE128 (extendable-output function) digest specifically encoded as hexadecimal. Use the free sandbox endpoint POST /v1/sandbox/digest-shake128-hex first for testing. Prefer this over SHA-2 or SHA-3 endpoints when an XOF (variable-length output) is required. Choose hex encoding over base64/base32 siblings when downstream systems expect hex format.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T06:47:51.995Z","isFirstParty":false,"canonicalSlug":"shake-128-hex-digest-7270fc88"}