{"uid":"cap_-uNcTvxrAnUmGs4SU8O_6","slug":"synapse-api-optimism-token-balances-348a16d6","name":"Synapse API — Optimism 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/optimism/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_umYl60V6_f-j7y-GApj5f","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 address on the Optimism (OP Mainnet) blockchain, optionally filtered by contract addresses.","exampleAgentPrompt":"What are the ERC-20 token balances for wallet 0xAbC...123 on Optimism? Also check specifically for USDC (0x7F5c764cBc14f9669B88837ca1490cCa17c31607) and OP (0x4200000000000000000000000000000000000042).","exampleUseCases":[{"title":"DeFi portfolio snapshot on Optimism","prompt":"Pull all the ERC-20 token balances for my wallet 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe on Optimism so I can see what I'm holding."},{"title":"Verify token receipt after bridge transfer","prompt":"After bridging, can you confirm that wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B received USDC on Optimism? The USDC contract is 0x7F5c764cBc14f9669B88837ca1490cCa17c31607."},{"title":"Airdrop eligibility token check","prompt":"Check whether address 0x1234567890abcdef1234567890abcdef12345678 holds any of these three tokens on Optimism — OP at 0x4200000000000000000000000000000000000042, WETH at 0x4200000000000000000000000000000000000006, and SNX at 0x8700dAec35aF8Ff88c16BdF0418774CB3D7599B4."}],"resultDescription":"Returns token balance data for each specified ERC-20 contract (or all tokens held) for the given wallet on Optimism, including token quantities and likely token metadata such as symbol and decimals.","failureModes":["Invalid or malformed wallet address returns an error","Non-existent contract address returns zero balance or an error","Network/RPC issues may cause timeouts","Payment failure (x402) prevents the call from completing","Empty contractAddresses array may return all tokens or nothing depending on implementation"],"whenToPreferThis":"Use this endpoint when you specifically need ERC-20 token balances on the Optimism (OP Mainnet) L2 network. Prefer this over generic on-chain tools if you want a pay-per-call, no-subscription model via x402 micropayments and are querying the Optimism chain specifically rather than Ethereum mainnet or other L2s.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:58:01.934Z","isFirstParty":false}