{"uid":"cap_7SGSNEPvJ_G-fiYB1-FnY","slug":"sha3-256-hex-digest-api-81f0de4e","name":"SHA3-256 Hex Digest API","description":"Call when an agent needs a sha3-256 digest of text, encoded as hex. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-256-hex first.","url":"https://agentshelf.syntexa.ch/v1/digest-sha3-256-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":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_HBbADBiHJWXiSUTsCw7cC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes a SHA3-256 cryptographic hash of input text and returns it as a hexadecimal string","exampleAgentPrompt":"Can you compute the SHA3-256 hash of the text 'Hello, world! This is my important message.' and give me back the result as a hex string?","exampleUseCases":[{"title":"Data integrity checksum for logs","prompt":"I need to fingerprint this log entry for tamper detection — can you hash 'ERROR 2024-06-01T12:00:00Z: disk quota exceeded on node-7' using SHA3-256 and return the hex digest?"},{"title":"Deterministic ID generation from content","prompt":"Generate a SHA3-256 hex digest of this JSON blob so I can use it as a content-addressable key: '{\"user\":\"alice\",\"action\":\"login\",\"ts\":1717200000}'"},{"title":"Password pre-hash before storage","prompt":"Hash the string 'MyS3cur3P@ssw0rd!' with SHA3-256 and give me the hex result before I send it to the storage layer."}],"resultDescription":"A JSON response containing the SHA3-256 hexadecimal digest of the submitted text. The output is a lowercase hex string of fixed length (64 hex characters representing 256 bits). No network calls or LLM are involved; the result is purely deterministic computation.","failureModes":["Empty or missing 'text' field returns a validation error","Text exceeding 100,000 characters is rejected","Missing or invalid API key returns an authentication error","Malformed JSON request body returns a 400 error","Payment of $0.003 USDC not included or failed results in 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when you need a SHA3-256 hash specifically encoded as lowercase hexadecimal, with no external network dependency and purely deterministic output. Prefer the free sandbox endpoint POST /v1/sandbox/digest-sha3-256-hex for testing. Use this paid endpoint in production when you need SHA3-256 hex digests at scale and the $0.003 USDC per-call cost is acceptable. If you need a different hash algorithm (SHA-384, SHA-512) or a different encoding (base64, base64url, base32), sibling endpoints on the same host provide those variants.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:52:03.340Z","isFirstParty":false,"canonicalSlug":"sha3-256-hex-digest-api-81f0de4e"}