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Synapse API — Token Balances Lookup
x402
Synapse API — Token Balances Lookup is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Retrieves token balances for a given wallet owner address across specified ERC-20 or multi-chain contract addresses
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns a list of token balances associated with the specified owner address and contract addresses, including balance amounts per token contract, enabling portfolio analysis and pre-transaction verification.
Example use cases
DeFi portfolio snapshot check
“What are the current token balances for my wallet 0x742d35Cc6634C0532925a3b844Bc454e4438f44e? Include USDC at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and DAI at 0x6B175474E89094C44Da98b954EedeAC495271d0F.”
Pre-transaction balance verification
“Before I send the transaction, can you verify the token balance for address 0x1234...abcd for the WETH contract at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 to make sure there are enough funds?”
Multi-token holding audit
“I need to audit the token holdings for 0xdEAD000000000000000042069420694206942069 — check balances for these contracts: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/tempo/token/balancesWhen to prefer
Choose this endpoint when you need to fetch on-chain token balances for a specific wallet address across one or more ERC-20 or compatible token contracts in a pay-per-call model without managing your own RPC infrastructure. Ideal for spot checks, portfolio snapshots, or pre-transaction balance validation where real-time data is needed cheaply.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Unknown or unsupported contract address returns zero balance or error
- Network congestion may cause delayed responses
- Missing required 'owner' field causes a validation error
- Unsupported blockchain network for a given contract address may yield no data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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