{"uid":"cap__3-DnvieY3kx8R4VDOlEx","slug":"ethereum-eip-55-address-checksum-validator-44ea671e","name":"Ethereum EIP-55 Address Checksum Validator","description":"Validate and compute the EIP-55 checksum of an Ethereum address - precise mixed-case checksum that catches typos, which LLMs cannot reliably produce. checksum address, eip55, address validation, ethereum checksum, validate address, address checksum","url":"https://api.x402node.dev/crypto/address-checksum","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"Ethereum address to checksum (required)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":{"request":{"address":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045"},"response":{"note":"EIP-55 checksum. Use checksumAddress for safe display. inputWasCorrectChecksum=false means the input had wrong casing.","_hint":"x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)","input":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045","source":"viem","isValid":true,"lowercase":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045","checksumAddress":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","inputWasCorrectChecksum":false}},"exampleRequest":{"address":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045"},"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cpxn7MqtWmyUt3iPQ-JCC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates and computes the EIP-55 mixed-case checksum for an Ethereum address, ensuring correctness and catching typos.","exampleAgentPrompt":"Can you validate and return the proper EIP-55 checksummed version of this Ethereum address: 0xd8da6bf26964af9d7eed9e03e53415d37aa96045?","exampleUseCases":null,"resultDescription":"Returns the EIP-55 checksummed version of the input Ethereum address (correct mixed-case hex string) along with a validity status indicating whether the original input was already correctly checksummed or needed correction.","failureModes":["Invalid hex string — returns error if input is not a valid Ethereum address format","Missing address parameter — returns 400 if no address is supplied","Non-Ethereum address formats (e.g. Bitcoin, Solana) — not applicable and will return an error","Address with invalid length — must be 40 hex characters (plus optional 0x prefix)"],"whenToPreferThis":"Use this endpoint when you need to programmatically verify or normalize an Ethereum address to its EIP-55 mixed-case checksum before storing, displaying, or transacting — especially important since LLMs cannot reliably produce correct EIP-55 checksums on their own. Prefer this over manual string manipulation or LLM-generated checksums whenever address integrity matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:54:14.121Z","isFirstParty":false}