{"uid":"cap_kUBVRWFKSiYwFhSzEZ0mQ","slug":"crc-16-integrity-checksum-27395fb1","name":"CRC-16 Integrity Checksum","description":"CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic.","url":"https://checksum.openverbs.com/v1/crc16","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["data"],"properties":{"data":{"type":"string","maxLength":5000000,"description":"Input payload."},"variant":{"enum":["ccitt-false","xmodem","modbus","ibm"],"type":"string","description":"CRC-16 variant. Default ccitt-false."},"encoding":{"enum":["utf8","hex","base64"],"type":"string","description":"How to decode `data`. Default utf8."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-BXsnzrPMrvRwhT92owlB","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes a CRC-16 checksum for a given data payload, supporting multiple CRC-16 variants (ccitt-false, xmodem, modbus, ibm) and input encodings (utf8, hex, base64).","exampleAgentPrompt":"Calculate a CRC-16 MODBUS checksum for this UTF-8 string: 'Hello, World!' so I can verify data integrity before transmitting it.","exampleUseCases":[{"title":"MODBUS protocol data validation","prompt":"I'm sending data over a MODBUS serial connection — can you compute the CRC-16 MODBUS checksum for this hex-encoded payload: '48656c6c6f' so I can append it to my frame?"},{"title":"File transfer integrity check","prompt":"Before I send this file over XMODEM, compute a CRC-16 XMODEM checksum for this base64-encoded data: 'SGVsbG8gV29ybGQ=' so I can confirm it arrives uncorrupted."},{"title":"Embedded firmware verification","prompt":"Can you calculate a CRC-16 CCITT-FALSE checksum for this UTF-8 string 'firmware-block-42-data' so I can embed it in my microcontroller's integrity check routine?"}],"resultDescription":"Returns a CRC-16 checksum value computed from the input data using the specified variant (ccitt-false, xmodem, modbus, or ibm) and decoding the input according to the specified encoding (utf8, hex, or base64).","failureModes":["Input data exceeds 5,000,000 character maximum — request rejected","Invalid encoding specified — must be utf8, hex, or base64","Invalid CRC-16 variant specified — must be ccitt-false, xmodem, modbus, or ibm","Malformed base64 or hex input that cannot be decoded","Missing required 'data' field in the body — returns validation error","Payment not included or insufficient — x402 payment required error"],"whenToPreferThis":"Prefer this endpoint when you need a quick, reliable CRC-16 checksum computation without running code locally, especially when working with specific CRC-16 variants like MODBUS for industrial protocols, XMODEM for file transfers, or CCITT for telecommunications. It is particularly useful in agent workflows that need data integrity checks without access to a runtime environment, or when verifying payloads before transmission in embedded or network protocol contexts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:30:26.687Z","isFirstParty":false}