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Agent Data Desk – Token Balance Lookup
x402
Agent Data Desk – Token Balance Lookup is a paid API for AI agents from x402-seller.zshnfaizal.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Returns the on-chain token balance for a given wallet address on Base or Ethereum, paid per-call at $0.002 USDC via x402.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call data for AI agents: weather ($0.005), defi_yields ($0.002), token_balance ($0.002), markdown ($0.01). USDC on Base mainnet via x402 v2; no API keys, no accounts.
Output
Returns a JSON object containing the queried wallet address, chain name, chain ID, token metadata (symbol, kind, contract address, decimals), balance as both a raw integer string and a human-readable formatted string, the RPC endpoint used, the block number at which the balance was fetched, and a UTC timestamp of when the data was retrieved.
Example use cases
DeFi agent pre-flight balance check
“Before executing this swap, check whether wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 has at least 500 USDC on Base mainnet.”
Portfolio tracker balance snapshot
“Fetch the current WETH balance for address 0xAbCd1234567890abcdef1234567890abcdef1234 on Ethereum so I can update my portfolio dashboard.”
Airdrop eligibility verification
“Check the DAI token balance on Base for address 0x1234567890abcdef1234567890abcdef12345678 — I need to verify they hold any DAI before qualifying them for the airdrop.”
Technical details
Endpoint
GEThttps://x402-seller.zshnfaizal.workers.dev/v1/token/balanceWhen to prefer
Choose this endpoint when you need a quick, no-account, pay-per-call on-chain token balance lookup for Base or Ethereum without setting up API keys or a subscription. It supports native ETH, common ERC-20 aliases (USDC, USDT, DAI, WETH, cbBTC), and arbitrary contract addresses, making it versatile for DeFi agents, portfolio trackers, and eligibility checks. At $0.002 per call it is cost-effective for low-to-moderate frequency queries.
Side effects
- Invalid or malformed wallet address returns an error response
- Unsupported token alias or invalid contract address yields an error
- Payment failure (insufficient USDC or x402 protocol error) results in a 402 response with no data
- Unsupported chain value (anything other than 'base' or 'ethereum') returns validation error
- RPC node unavailability may cause transient failures or timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"rpc": "mainnet.base.org",
"chain": "base",
"token": {
"kind": "erc20",
"symbol": "USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": 6
},
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"balance": {
"raw": "0",
"formatted": "0"
},
"chain_id": 8453,
"fetched_at": "2026-08-29T20:05:12.000Z",
"block_number": 41234567
}
}Tags
x402
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