{"uid":"cap_3NMmBzOlTB4caWHSBTuJQ","slug":"phantom-api-token-balances-lookup-19145b1d","name":"Phantom API — Token Balances Lookup","description":"Lightning-fast access to blockchain data, smart contract insights, and Web3 infrastructure across 57+ networks. Pay-per-call via x402.","url":"https://phantom-api-omega.vercel.app/api/tempo/token/balances?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"owner":{"type":"string"},"contractAddresses":{"type":"array","items":{"type":"string"}}}},"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_RsK0VjuQiPvuAXUoD0TqJ","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":"Fetches on-chain token balances for a given wallet address across specified ERC-20 or native contract addresses","exampleAgentPrompt":"What are the token balances for wallet 0xAbc123...def for these contracts: 0xToken1... and 0xToken2...? Use the Phantom API to pull the live on-chain data.","exampleUseCases":[{"title":"DeFi portfolio balance checker","prompt":"Can you pull the current on-chain token balances for my wallet 0x1234abcd...5678 for USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48) and WETH (0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2)?"},{"title":"Airdrop eligibility verification","prompt":"Check the on-chain token balance for wallet 0xDeadBeef...1234 against contract 0xMyToken...5678 — I need to know if they hold any tokens before we approve the airdrop claim."},{"title":"Smart contract holdings audit","prompt":"For the wallet address 0xVault...9999, look up balances across these three contract addresses: 0xToken1, 0xToken2, and 0xToken3 — I'm auditing what tokens the treasury is holding on-chain."}],"resultDescription":"Returns on-chain token balance data for the specified wallet owner across one or more contract addresses, including balance amounts for each token contract queried.","failureModes":["Invalid or malformed wallet address returns an error or empty result","Invalid contract address causes a failed or null balance lookup","Network not supported returns an error or no data","Rate limit or payment failure results in a 402 or 429 error","Empty contractAddresses array may return no results or a generic balance"],"whenToPreferThis":"Use this endpoint when you need fast, pay-per-call on-chain token balance lookups for a specific wallet and set of ERC-20 or token contracts, without needing a full node subscription. Ideal for spot checks, airdrop verification, DeFi portfolio queries, or treasury audits where you need current holdings data across multiple token contracts in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:44:56.121Z","isFirstParty":false,"canonicalSlug":"phantom-api-token-balances-lookup-19145b1d"}