{"uid":"cap_Alfq2mjhvzuZn-VC75-75","slug":"fletcher32-checksum-hex-agentshelf-syntexa-ch-50b263c6","name":"Fletcher32 Checksum (Hex) — agentshelf.syntexa.ch","description":"Call when an agent needs a fletcher32 checksum of text as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher32-hex first.","url":"https://agentshelf.syntexa.ch/v1/checksum-fletcher32-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":"0.007","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_22yXR4LgHW238Hi1z9Mer","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 a Fletcher-32 checksum of the provided text and returns it as a hexadecimal string, with no network calls or LLM involvement.","exampleAgentPrompt":"Can you compute the Fletcher-32 checksum of this text and give me the result as a hex string: 'The quick brown fox jumps over the lazy dog'?","exampleUseCases":[{"title":"Text integrity check before storage","prompt":"Before I save this config file contents to the database, compute the Fletcher-32 hex checksum of this text so I can store it alongside and detect any future corruption: 'server_host=localhost;port=5432;db=myapp'"},{"title":"Deduplication fingerprinting pipeline","prompt":"I'm processing a batch of user-submitted comments and need a fast non-cryptographic fingerprint for each one to detect duplicates — compute the Fletcher-32 hex checksum for this text: 'Great product, loved the experience!'"},{"title":"Protocol message checksum generation","prompt":"My custom protocol requires a Fletcher-32 checksum appended as hex to each message payload before transmission — calculate it for this message: 'PING:node42:timestamp=1718000000'"}],"resultDescription":"A hexadecimal string representing the Fletcher-32 checksum of the submitted text. The result is deterministic: the same input always produces the same hex output, with no randomness, network calls, or model inference involved.","failureModes":["Empty or missing 'text' field returns a validation error","Text exceeding 100,000 characters is rejected","Missing or invalid API key results in authentication failure","Malformed JSON body returns a 400 bad request","Payment failure (insufficient USDC balance) results in 402 response"],"whenToPreferThis":"Choose this endpoint when you need a fast, deterministic, non-cryptographic Fletcher-32 checksum of a text payload returned as a hex string, and you want a simple HTTP call rather than running checksum logic locally. It is especially useful in agent pipelines where local code execution is unavailable or undesirable. Prefer the free sandbox endpoint (/v1/sandbox/checksum-fletcher32-hex) for testing before incurring the $0.007 USDC charge.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:50:09.842Z","isFirstParty":false,"canonicalSlug":"fletcher32-checksum-hex-agentshelf-syntexa-ch-50b263c6"}