{"uid":"cap_sahLOMMv1UB56PDc_aGCd","slug":"aun-base-balance-checker-edf34eb6","name":"AUN Base Balance Checker","description":"Base Wallet Balance: ETH and ERC-20 balances (USDC by default, up to 10 tokens) of any address on Base mainnet. $0.001 per call.","url":"https://a-upgradenet.com/x402/base-balance?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"tokens":{"type":"array","items":{"type":"string"},"maxItems":10,"description":"ERC-20 contract addresses. Defaults to Base USDC."},"address":{"type":"string","description":"0x address on Base."}}},"responseSchema":{"type":"json","example":{"eth":"0.0123","chain":"base","status":"completed","tokens":[{"raw":"25500000","symbol":"USDC","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","balance":"25.5","decimals":6}],"address":"0x…","eth_wei":"12300000000000000","block_number":"21000000"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/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_sHb1NVI7aSqFyFFf59cKN","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":"Fetches ETH and ERC-20 token balances for a given 0x address on the Base blockchain","exampleAgentPrompt":"What's the current USDC and ETH balance for the Base wallet address 0x1234abcd…efgh right now?","exampleUseCases":[{"title":"DeFi portfolio balance snapshot","prompt":"Can you check how much USDC and ETH I have sitting in my Base wallet 0xAbCd1234…5678?"},{"title":"Verify payment received on Base","prompt":"Did my Base address 0xDEAD…BEEF receive the USDC payment yet? Check the current token balance for me."},{"title":"Multi-token holdings audit","prompt":"Look up all ERC-20 token balances for 0x9999…AAAA on Base — I want to see USDC plus any other tokens I might be holding."}],"resultDescription":"Returns a JSON object containing the wallet's ETH balance (in both ETH and wei), the block number at query time, the chain identifier ('base'), a status field, and an array of token objects each with address, symbol, decimals, raw balance, and human-readable balance.","failureModes":["Invalid or malformed 0x address returns an error response","Non-existent ERC-20 contract address may return zero balance or error","Exceeding the 10-token limit in the tokens array causes a validation error","Network congestion on Base may cause timeouts","Payment failure (x402 protocol) prevents the call from being processed"],"whenToPreferThis":"Use this endpoint when you need a fast, on-chain balance lookup specifically for addresses on the Base L2 network, particularly for USDC or other ERC-20 tokens. Prefer this over generic blockchain explorers when you need structured JSON output ready for downstream agent logic, and when you want to check up to 10 tokens in a single call without managing your own RPC node.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T00:30:35.189Z","isFirstParty":false,"canonicalSlug":"aun-base-balance-checker-edf34eb6"}