{"uid":"cap_fsAxDQKeVHeCUENsa5EGT","slug":"northline-chainkit-usdc-balance-lookup-ba5efc0c","name":"Northline ChainKit USDC Balance Lookup","description":"x402 pay-per-call onchain API (Base + Arc).","url":"https://northline-chainkit.northline-c86.workers.dev/v1/usdc/balances?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"balances":[{"usdc":"8.29","chain":"base"},{"usdc":"0.44","chain":"arc"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm__I9qg_5WaW1VYyhMqiFpC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches USDC token balances for a given Ethereum-compatible wallet address across Base and Arc chains.","exampleAgentPrompt":"What's the USDC balance for wallet 0x4A3B2C1D0E9F8A7B6C5D4E3F2A1B0C9D8E7F6A5B on Base and Arc?","exampleUseCases":[{"title":"DeFi portfolio balance check","prompt":"Can you check how much USDC wallet 0x1A2B3C4D5E6F7A8B9C0D1E2F3A4B5C6D7E8F9A0B holds across Base and Arc right now?"},{"title":"Payment eligibility verification","prompt":"Before I send an invoice, check if address 0xDEADBEEFCAFEBABE0000000000000000DEADBEEF has at least 50 USDC available on Base or Arc."},{"title":"Onchain treasury monitoring","prompt":"Pull the current USDC balance for our treasury wallet 0xABCDEF1234567890ABCDEF1234567890ABCDEF12 on both Base and Arc so I can update our dashboard."}],"resultDescription":"Returns a JSON object containing a list of USDC balances per chain, e.g. [{\"usdc\":\"8.29\",\"chain\":\"base\"},{\"usdc\":\"0.44\",\"chain\":\"arc\"}]. Each entry specifies the USDC amount as a decimal string and the chain name.","failureModes":["Invalid or malformed wallet address (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error","Missing required 'address' query parameter results in a 400-level error","Payment not fulfilled (x402 payment required) results in a 402 response before data is returned","Wallet address exists but holds zero USDC — balances may return 0.00 for one or both chains","Chain-specific RPC outage may cause partial or failed responses for one chain"],"whenToPreferThis":"Use this endpoint when you need real-time USDC balances for a specific wallet address across both Base and Arc chains in a single call. Prefer this over generic block explorers when you want a pay-per-use, structured JSON response with cross-chain aggregation and no API key setup — especially in agentic workflows using the x402 micropayment protocol.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T07:03:04.079Z","isFirstParty":false,"canonicalSlug":"northline-chainkit-usdc-balance-lookup-ba5efc0c"}