{"uid":"cap_e8Xy59gjxKDjzOSybC3h0","slug":"fletcher-16-checksum-hex-via-syntexa-agentshelf-c84b26a1","name":"Fletcher-16 Checksum (Hex) via Syntexa AgentShelf","description":"Call when an agent needs a fletcher16 checksum of text as hex. No network and no LLM. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher16-hex first.","url":"https://agentshelf.syntexa.ch/v1/checksum-fletcher16-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_0TRfxk384aeSorjiKlZDM","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 the Fletcher-16 checksum of a given text string and returns the result as a hexadecimal value","exampleAgentPrompt":"Can you compute the Fletcher-16 checksum of the text 'Hello, world!' and give me the result as a hex value?","exampleUseCases":[{"title":"Data integrity check before storage","prompt":"Before I write this config file content to disk, compute the Fletcher-16 hex checksum of it so I can verify integrity later: 'timeout=30\\nretry=3\\nhost=db.internal'"},{"title":"Protocol frame validation","prompt":"I'm building a simple serial protocol and need the Fletcher-16 hex checksum for the message payload 'ACK:device42:status:ok' — can you get that for me?"},{"title":"Deterministic content fingerprinting","prompt":"Generate a Fletcher-16 hex fingerprint for this log line so I can deduplicate entries: '2024-06-01T12:00:00Z ERROR disk full on /dev/sda1'"}],"resultDescription":"Returns the Fletcher-16 checksum of the submitted text as a hexadecimal string. The computation is performed deterministically server-side with no network calls or LLM involvement, so the same input always yields the same hex output.","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","Payment not provided or insufficient USDC results in a 402 Payment Required response"],"whenToPreferThis":"Use this endpoint when you need a fast, deterministic Fletcher-16 hex checksum of a text payload and do not want to execute arbitrary code locally. Prefer the free sandbox POST /v1/sandbox/checksum-fletcher16-hex first for testing; use this paid endpoint in production. Choose CRC32C or Adler-32 siblings on the same platform if you need stronger or differently-formatted checksums.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:50:06.132Z","isFirstParty":false,"canonicalSlug":"fletcher-16-checksum-hex-via-syntexa-agentshelf-c84b26a1"}