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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 2026-10-12).
Fetches token balances for a given wallet address across multiple ERC-20 or similar contract addresses on supported blockchain networks.
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 for the specified owner wallet, one entry per contract address provided, including token amounts and likely token metadata such as symbol and decimals.
Example use cases
DeFi portfolio balance audit
“What are the current token balances for wallet 0x742d35Cc6634C0532925a3b844Bc454e4438f44e across these stablecoin contracts: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for USDC and 0xdAC17F958D2ee523a2206206994597C13D831ec7 for USDT?”
Airdrop eligibility token check
“Before the airdrop snapshot, can you check how many governance tokens the wallet 0x1234567890abcdef1234567890abcdef12345678 holds for contract 0x6B175474E89094C44Da98b954EedeAC495271d0F?”
Multi-wallet treasury monitoring
“Look up the token balances for our treasury wallet 0xDead...Beef across our three project token contracts so I can update the dashboard with current holdings.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/stable/token/balances?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly look up token balances for a specific wallet across one or more ERC-20 or similar token contracts without setting up your own blockchain node. It is ideal for pay-per-call use cases where you don't want a subscription, need multi-contract batch queries in a single call, and require coverage across a wide range of 57+ blockchain networks.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Non-existent or incorrect contract addresses return zero balances or errors
- Unsupported blockchain network not included in the 57+ supported chains may return an error
- Rate limiting or payment failure if x402 micropayment is not properly handled
- Network congestion or RPC unavailability on the target chain may cause timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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