{"uid":"cap_alsFJZuMvVSoj2e8XsgUH","slug":"evm-address-checksum-eip-55-6e15066e","name":"EVM Address Checksum (EIP-55)","description":"Pay-per-call utility APIs for agents: EVM helpers (checksum, unit conversion, keccak), data transforms (CSV to JSON, JSON diff, URL canonicalisation), text tools (hashing, JWT decode), and Bazaar market intelligence. x402 on Base mainnet.","url":"https://pastable-x402.pages.dev/evm/checksum","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"string"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object"}}},"responseSchema":{"type":"json","example":{"input":"0x9fd25b6be40aecea5eb5eceea31d6c0ac9c83e11","checksummed":"0x9Fd25b6be40aECEA5eB5Eceea31d6c0Ac9c83e11","was_checksummed":false,"input_passes_eip55":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_K0FclcAoCLExh7nByrd_3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Converts an Ethereum address to its EIP-55 checksummed form and validates whether the input was already checksummed","exampleAgentPrompt":"Can you checksum this Ethereum address for me and tell me whether it was already EIP-55 compliant: 0x9fd25b6be40aecea5eb5eceea31d6c0ac9c83e11?","exampleUseCases":[{"title":"Normalize address before on-chain transaction","prompt":"I'm about to send ETH to 0xab5801a7d398351b8be11c439e05c5b3259aec9b — can you give me the properly checksummed EIP-55 version of that address so I can verify it before sending?"},{"title":"Validate user-submitted wallet address","prompt":"A user just entered 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae as their withdrawal address — check whether it's a valid EIP-55 checksummed Ethereum address or if it needs to be normalized."},{"title":"Audit address list for checksum compliance","prompt":"I have this Ethereum address from our database: 0x5aae5375f5ee6601ea99fa5af9fce0b695de4e3a — was it stored with the correct EIP-55 checksum, and what should it look like if not?"}],"resultDescription":"Returns a JSON object with the original input address, the EIP-55 checksummed version, a boolean indicating whether the input was already checksummed, and a boolean confirming whether the input passes EIP-55 validation.","failureModes":["Missing or malformed address query parameter returns an error","Non-hex or invalid Ethereum address string may return a validation error","Addresses without the 0x prefix may fail parsing","Payment not included or insufficient USDC triggers x402 payment-required response"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call EIP-55 address checksum operation without running a local Web3 library. Ideal for agents operating in environments where installing ethers.js or web3.py is impractical, or when you need a lightweight, stateless validation step in a workflow that already handles x402 micropayments on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:42:08.413Z","isFirstParty":false}