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Synapse API — zkSync Token Balances
x402
Synapse API — zkSync 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 ERC-20 token balances for a given wallet address on the zkSync network, optionally filtered by specific 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 token balance data for the specified wallet owner on the zkSync network, including token amounts for each queried contract address or all held tokens if no contracts are specified.
Example use cases
DeFi portfolio snapshot on zkSync
“What ERC-20 tokens does wallet 0x1234...abcd hold on zkSync right now? Give me all balances.”
Monitor specific token holdings
“Check whether wallet 0xDeFi...5678 has any USDC or WETH on zkSync — the contract addresses are 0xUSDC and 0xWETH.”
Verify token receipt after transfer
“I just sent some tokens to 0xRecipient...9999 on zkSync. Can you confirm the balance of contract 0xMyToken shows up in their wallet now?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/zksync/token/balancesWhen to prefer
Choose this endpoint when you specifically need token balances on the zkSync Layer 2 network. It supports pay-per-call via x402 (no API key setup needed), making it ideal for autonomous agents that need on-demand zkSync balance lookups without a subscription. Prefer this over general Ethereum balance APIs when zkSync-native data is required.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Non-existent or non-ERC-20 contract addresses may return zero balances or errors
- zkSync RPC unavailability causes timeout or 5xx error
- Payment failure via x402 protocol blocks the request
- Rate limiting if called too frequently
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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