{"uid":"cap_tojJqbaWoM7Lf_QvmD6aq","slug":"xerxes-base-wallet-snapshot-0500b9d9","name":"Xerxes Base Wallet Snapshot","description":"Base wallet snapshot at head: native ETH balance, nonce, is_contract. Optional ERC-20 balanceOf via ?token=. One 402, parallel RPC. No USD quote. Dead RPC is unread, not zero.","url":"https://ari001.tailb4ac3a.ts.net/v1/base/wallet/:addr","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","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","required":["addr"],"properties":{"addr":{"type":"string","description":"20-byte 0x address on Base"}}},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rYezE-KaDWofbPGeY3R2p","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a snapshot of a Base address at the chain head: native ETH balance, nonce, and contract status, with optional ERC-20 balance lookup via query parameter.","exampleAgentPrompt":"What's the current ETH balance, nonce, and whether it's a contract for Base address 0x742d35Cc6634C0532925a3b8D4C9C0F2b9E1234 — and also check its USDC balance?","exampleUseCases":[{"title":"Check if wallet is funded before trade","prompt":"Before we attempt this swap, can you check whether 0xAbCd1234...5678 on Base has any ETH and what its nonce is, so I know it's a live EOA and not empty?"},{"title":"Verify ERC-20 token holdings","prompt":"Does wallet 0x1a2b3c4d...ef on Base actually hold any WETH? Can you check its WETH balance using the token contract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2?"},{"title":"Detect smart contract vs EOA","prompt":"Is 0xDEF456...789 on Base a smart contract or a regular wallet? I need to know before sending a direct ETH transfer."}],"resultDescription":"Returns a JSON object containing the address's native ETH balance (in wei or formatted), nonce (transaction count), and a boolean is_contract flag indicating whether the address is a deployed smart contract. If the ?token= query parameter is provided with an ERC-20 contract address, also returns the ERC-20 balanceOf result. Note: if the underlying RPC is unreachable, the field is returned as unread/null rather than zero, to distinguish from a genuine zero balance.","failureModes":["Invalid or malformed 0x address returns a 4xx error","RPC node unavailable: field returned as unread/null, not zero — agent must distinguish null from 0","ERC-20 token address invalid or not a valid ERC-20 contract: token balance call may fail or return null","402 Payment Required if x402 payment not attached","Address not found on Base (address never used) still returns nonce=0 and balance=0 — valid response"],"whenToPreferThis":"Use this endpoint when you need a quick, lightweight snapshot of a Base address at the current chain head — covering native ETH balance, nonce, and contract detection in a single call. Prefer this over full block explorers or multicall setups when you only need head-state data for one address. Use the optional ?token= parameter to also fetch a single ERC-20 balance without a separate call. Do not use this if you need historical balances, USD-denominated quotes, or balances at a specific block number.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:41:20.794Z","isFirstParty":false}