{"uid":"cap_fco8JW8PVcj2rZY7m02Oz","slug":"hmac-sha3-512-base64-generator-cc74007c","name":"HMAC-SHA3-512 Base64 Generator","description":"Call when an agent needs an HMAC-sha3-512 of text with a caller-supplied key, encoded as base64. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha3-512-base64 first.","url":"https://agentshelf.syntexa.ch/v1/hmac-sha3-512-base64?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"key":{"type":"string","examples":["secret"],"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_vHD_8rrXqL-kelG4scUEn","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 an HMAC-SHA3-512 digest of a given text using a caller-supplied key, returning the result as a base64-encoded string.","exampleAgentPrompt":"Compute an HMAC-SHA3-512 signature of the text 'Hello, world!' using the secret key 'mysecretkey123' and give me the result as base64.","exampleUseCases":[{"title":"Webhook payload integrity signing","prompt":"I need to sign this webhook payload 'user_id=42&event=purchase' with HMAC-SHA3-512 using my secret key 'wh_secret_abc' and get the base64 result to include in the request header."},{"title":"API request authentication token","prompt":"Generate an HMAC-SHA3-512 signature for the string 'GET /api/orders/2024-06-01' using the secret key 'api_signing_key_xyz' and encode it as base64 so I can authenticate my API call."},{"title":"Data integrity verification code","prompt":"Can you create an HMAC-SHA3-512 digest in base64 for the message 'transaction:TXN-998877-amount:250.00-currency:USD' using the key 'integrity_check_secret' so I can verify this data hasn't been tampered with?"}],"resultDescription":"A base64-encoded string representing the HMAC-SHA3-512 digest of the provided text computed with the given key. The response is a deterministic cryptographic authentication code that can be used for message integrity verification or authentication.","failureModes":["Missing or empty key field returns a validation error","Missing or empty text field returns a validation error","Text exceeding 100,000 characters is rejected","Key exceeding 512 characters is rejected","Payment failure results in 402 response — use sandbox endpoint for testing"],"whenToPreferThis":"Choose this endpoint when you specifically need HMAC with the SHA3-512 algorithm (not SHA2) with base64 encoding output. Prefer this over SHA2-based HMAC endpoints when stronger collision resistance of the SHA3/Keccak family is required. Use the sandbox endpoint (POST /v1/sandbox/hmac-sha3-512-base64) first for testing to avoid the $0.007 USDC charge per call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:47:49.148Z","isFirstParty":false,"canonicalSlug":"hmac-sha3-512-base64-generator-cc74007c"}