{"uid":"cap_Wc02ZbbFwEb2NNDHW3Bzf","slug":"delx-commerce-evm-address-checksum-validator-d0ddfa2b","name":"Delx Commerce — EVM Address Checksum Validator","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/address-checksum-evm?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","description":"EVM address (40 hex chars, optional 0x)."}}},"responseSchema":{"type":"json","example":{"valid":true,"schema":"delx/util-address-checksum-evm/v1","algorithm":"keccak256","matches_input":true,"checksum_address":"0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/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_LqKNYJSE50bu2-bjWi7H4","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 returns the ERC-55 keccak256 checksummed (mixed-case) version of an EVM address, confirming validity and whether it matches the input.","exampleAgentPrompt":"Can you validate and return the proper ERC-55 checksummed version of this Ethereum address: 0x95222290dd7278aa3ddd389cc1e1d165cc4bafe5?","exampleUseCases":[{"title":"Wallet address normalization before transfer","prompt":"Before I send funds, can you checksum-validate this EVM address and give me the canonical mixed-case version: 0xab5801a7d398351b8be11c439e05c5b3259aec9b?"},{"title":"Smart contract address verification","prompt":"I have this contract address I pulled from a forum — 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae — can you confirm it's a valid EVM address and give me the properly checksummed form?"},{"title":"User-submitted address sanity check","prompt":"A user just submitted the address 0x4838b106fce9647bdf1e7877bf73ce8b0bad5f97 in our app — can you verify it's a valid Ethereum address and return the correct ERC-55 checksum version?"}],"resultDescription":"Returns a JSON object with: a boolean `valid` indicating if the address is a well-formed EVM address, the `checksum_address` in ERC-55 mixed-case format, the `algorithm` used (keccak256), a `matches_input` boolean indicating whether the input already matched the checksum, and a `schema` identifier string.","failureModes":["Invalid or malformed hex string returns valid:false","Address shorter or longer than 40 hex characters fails validation","Non-hex characters in address cause rejection","Payment failure via x402 results in 402 response before processing","Network timeout if Base or Solana payment rail is congested"],"whenToPreferThis":"Use this endpoint when you need a fast, pay-per-call (no signup, no API key) ERC-55 checksum validation for EVM addresses, especially in agent pipelines that already use the x402 micropayment protocol. Ideal for lightweight, one-off address normalization without managing API credentials.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:53:43.232Z","isFirstParty":false,"canonicalSlug":"delx-commerce-evm-address-checksum-validator-d0ddfa2b"}