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Synapse API — Katana Token Balances
x402
Synapse API — Katana Token Balances 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).
Fetches token balances for a given wallet owner address across specified ERC-20 or native token contract addresses on the Katana network
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 address, one entry per contract address provided, including token amounts and possibly token metadata such as symbol and decimals.
Example use cases
DeFi portfolio snapshot for a wallet
“What are the current token balances for wallet 0x742d35Cc6634C0532925a3b8D4C9E9d4b3e1234 on Katana for these contracts: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and 0xdAC17F958D2ee523a2206206994597C13D831ec7?”
Verify holdings before a DeFi trade
“Before I execute this swap, can you confirm how much of token 0x6B175474E89094C44Da98b954EedeAC495271d0F my wallet 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe is currently holding on Katana?”
Audit a whale wallet's token exposure
“I want to audit this whale wallet — can you pull the token balances for 0xBE0eB53F46cd790Cd13851d5EFf43D12404d33E8 across these Katana token contracts: 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 and 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/katana/token/balancesWhen to prefer
Use this endpoint when you need on-chain token balance data specifically on the Katana network for one or more ERC-20 token contracts for a given wallet address. Prefer this over generic blockchain explorers when you need programmatic, pay-per-call access with no API key setup, or when integrating into an agent that pays via x402 USDC micropayments.
Side effects
- Invalid owner address format returns an error
- Invalid or non-existent contract address returns zero balance or an error
- Empty contractAddresses array may return an empty result set
- Network timeout if the Katana RPC node is slow or unavailable
- Payment failure if x402 USDC payment of $0.01 is not processed correctly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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