{"uid":"cap_p4FUwlEBVOPRnDiNWk3Ga","slug":"synapse-api-plasma-token-balances-053f37e2","name":"Synapse API — Plasma Token Balances","description":"High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.","url":"https://synapse-api-brown.vercel.app/api/plasma/token/balances","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_M9VFtIwB98vTd9VzcAQIy","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 ERC-20/token balances for a given wallet owner address across specified contract addresses on blockchain networks","exampleAgentPrompt":"Check the token balances for wallet 0xAbC123... and these contract addresses: 0xToken1, 0xToken2 — I want to know how much of each token that wallet holds.","exampleUseCases":[{"title":"DeFi portfolio snapshot","prompt":"Can you pull the token balances for my wallet 0x1234abcd... across these contract addresses: 0xUSDC, 0xDAI, and 0xWETH? I want to see how much of each I'm holding."},{"title":"Smart contract airdrop eligibility check","prompt":"Check if wallet 0xdeadbeef... holds any tokens from these contract addresses — 0xToken1 and 0xToken2 — so I can verify if they qualify for the airdrop."},{"title":"On-chain treasury balance monitoring","prompt":"Fetch the current token balances for our DAO treasury wallet 0xTreasury123 across our governance token 0xGOV and stablecoin 0xUSDC contracts."}],"resultDescription":"Returns token balance data for the specified owner address across each provided contract address, including the balance amounts held by that wallet for each token contract queried.","failureModes":["Invalid or malformed owner address returns an error","Unknown or invalid contract address may return zero balance or error","Network/RPC errors for specific chains may cause lookup failure","Missing required owner field returns validation error","Empty contractAddresses array may return empty results"],"whenToPreferThis":"Use this endpoint when you need to quickly look up on-chain token balances for one or more ERC-20 token contracts for a specific wallet address, especially when paying per-call via x402 micropayments without needing a persistent API key subscription.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:58:12.716Z","isFirstParty":false}