{"uid":"cap_T--x8UYmVWFIcnqOhruOa","slug":"keccak256-hash-generator-536e34b9","name":"Keccak256 Hash Generator","description":"opentools utility endpoint","url":"https://chargers-borders-cedar-fig.trycloudflare.com/tools/keccak256","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"body":{"type":"object"},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"bodyType":{"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"unprobed","priceSource":"registry","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":"unknown","summary":"price unknown","primary":{"kind":"unknown","protocol":"x402","network":"base","amountUsd":null,"per":"call","confidence":"unknown"},"accepted":[{"kind":"unknown","protocol":"x402","network":"base","amountUsd":null,"per":"call","confidence":"unknown"}]},"paymentMethods":[{"uid":"pm_BUMPyMHYOJtMI1ZWT0gV2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7c32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the Keccak-256 cryptographic hash of a given input, commonly used in Ethereum and blockchain applications","exampleAgentPrompt":"Can you compute the keccak256 hash of the string 'Hello, World!' for me? I need it for an Ethereum smart contract function selector.","exampleUseCases":[{"title":"Ethereum function selector derivation","prompt":"What's the keccak256 hash of the string 'transfer(address,uint256)'? I need the first 4 bytes to build a function selector for an EVM call."},{"title":"Smart contract event topic hashing","prompt":"Compute the keccak256 hash of 'Transfer(address,address,uint256)' — I need the event topic ID to filter Ethereum logs."},{"title":"Arbitrary data integrity fingerprinting","prompt":"Hash this JSON payload with keccak256 so I can store the digest on-chain as a tamper-evident proof: '{\"user\":\"alice\",\"amount\":500}'"}],"resultDescription":"Returns a 32-byte (64-character) hexadecimal Keccak-256 hash digest of the provided input, suitable for use in Ethereum smart contracts, ABI encoding, event topic generation, and other blockchain or cryptographic workflows.","failureModes":["Missing or malformed 'input' field returns a 400-level error","Unsupported HTTP method (e.g. GET) returns 405","Empty body may return a hash of empty string or an error depending on server validation","Service unavailability on the Cloudflare tunnel may return 502 or 504"],"whenToPreferThis":"Choose this endpoint when you need a quick, serverless Keccak-256 hash computation without running a local crypto library — especially useful in blockchain/Ethereum contexts where SHA-3 (standard) and Keccak-256 differ and you specifically need the Ethereum-compatible variant.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:44:00.011Z","isFirstParty":false}