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Synapse API — Arbitrum Token Balances
x402
Synapse API — Arbitrum 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 2026-10-16).
Fetches ERC-20 token balances for a given wallet address on the Arbitrum network, optionally filtered to 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 address on the Arbitrum network, including balance amounts for each ERC-20 token held (optionally filtered to the provided contract addresses). Typically includes token amounts, possibly with token metadata such as symbol and decimals.
Example use cases
DeFi portfolio tracker for Arbitrum
“Can you check the full token portfolio for wallet 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Arbitrum and tell me all the ERC-20 tokens it holds and their balances?”
Verify specific token balance before swap
“Before I do a swap, can you confirm how much USDC the wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B holds on Arbitrum? The USDC contract is 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8.”
Monitor airdrop token receipt on Arbitrum
“Check if wallet 0x1234567890abcdef1234567890abcdef12345678 has received the airdropped ARB tokens yet — the contract address is 0x912CE59144191C1204E64559FE8253a0e49E6548.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/arbitrum/token/balances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to look up ERC-20 token balances for a specific wallet address specifically on the Arbitrum Layer-2 network. It is ideal for DeFi agents, portfolio trackers, and pre-transaction balance checks on Arbitrum. Prefer this over generic blockchain APIs when you need Arbitrum-specific data with pay-per-call pricing and no subscription commitment.
Side effects
- Invalid or malformed wallet address returns an error
- Non-existent or incorrect contract address may return zero balance or an error
- Payment failure via x402 protocol blocks the request
- Arbitrum node unavailability or RPC timeout causes delayed or failed response
- Empty contractAddresses array may return all token balances or nothing depending on implementation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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