{"uid":"cap__WHb5NZfEatuYAFa2ZX2G","slug":"finmath-eth-address-checksum-97afb83f","name":"finmath ETH Address Checksum","description":"Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.","url":"https://finmath.qzqh5rrbkz.workers.dev/v1/eth_address_checksum","method":"POST","headers":{},"bodySchema":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"address"}}},"responseSchema":{"type":"object","required":["result","meta"],"properties":{"meta":{"type":"object"},"result":{}}},"example":{"request":{"address":"0x1234567890123456789012345678901234567890"},"response":{"meta":{"tool":"eth_address_checksum","disclaimer":"Deterministic calculation utility. Not financial, investment, or trading advice.","deterministic":true},"result":{"checksummed":"0x1234567890123456789012345678901234567890"}}},"exampleRequest":{"address":"0x1234567890123456789012345678901234567890"},"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_StJ2C19TcQvQrSKMX6NRT","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","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 (mixed-case) canonical form","exampleAgentPrompt":"Can you checksum this Ethereum address for me so it's in proper EIP-55 format? The address is 0xd8da6bf26964af9d7eed9e03e53415d37aa96045","exampleUseCases":null,"resultDescription":"Returns a result object containing the EIP-55 checksummed Ethereum address (mixed-case hex string) and a meta object with call metadata. The checksummed address has capital letters inserted at specific positions per the Keccak-256 hash of the lowercase address, making it self-validating.","failureModes":["Invalid Ethereum address format — not a 40-hex-character string after 0x prefix returns an error","Missing required 'address' field in request body returns a validation error","Non-hex characters in address cause parsing failure","Payment not provided or insufficient USDC causes 402 Payment Required response"],"whenToPreferThis":"Use this endpoint when you need a deterministically correct EIP-55 checksummed Ethereum address and cannot trust an LLM to perform the Keccak-256 hashing required by the standard. Prefer this over ad-hoc LLM address formatting whenever you are passing an address to a smart contract, wallet, or system that validates checksum casing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:39:22.627Z","isFirstParty":false}