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On-Chain ERC-20 Token Balance Lookup
x402
On-Chain ERC-20 Token Balance Lookup is a paid API for AI agents from agent-commerce-factory-jm.austriaeast.cloudapp.azure.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Returns the live ERC-20 token balance for a wallet address on a given EVM chain, including raw units, human-readable balance, token name, symbol, and decimals.
Price / call$0.002
Success—
StatusUnknown
Output
Returns a JSON object with the wallet address, contract address, chain, and a balance object containing: the raw token balance (in smallest units as a string), the human-readable balance (adjusted for decimals), the token name, symbol, decimals count, and contract address. Also includes economics metadata showing the call price.
Example use cases
Airdrop eligibility balance check
“Can you check the balance of the ARB token (contract 0x912CE59144191C1204E64559FE8253a0e49E6548) for wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Arbitrum? I need to verify if they received the airdrop.”
DeFi portfolio token valuation
“I'm building a DeFi portfolio summary — can you fetch the WETH balance (contract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2) for wallet 0x47ac0Fb4F2D84898e4D9E7b4DaB3C24507a6D503 on Ethereum so I can calculate its USD value?”
Treasury monitoring for DAO
“Please check the current USDT balance (contract 0xdAC17F958D2ee523a2206206994597C13D831ec7) held by our DAO treasury at 0x4F868C1aa37fCf307ab38D215382e88FCA6275E2 on Ethereum — we track this weekly.”
Technical details
Endpoint
POSThttps://agent-commerce-factory-jm.austriaeast.cloudapp.azure.com/v1/onchain/token-balanceWhen to prefer
Use this endpoint when you need live, on-chain ERC-20 token balances read directly from the blockchain — not from a centralized index or exchange. Ideal for wallet trackers, DeFi portfolio tools, airdrop verification, and treasury monitoring agents that require exact raw balances and token metadata (name, symbol, decimals) in a single call. Prefer this over exchange-based balance APIs when the wallet is non-custodial or when you need balances for arbitrary ERC-20 tokens by contract address across multiple EVM chains.
Side effects
- Invalid wallet address format (must match 0x + 40 hex chars) returns a validation error
- Invalid or non-ERC-20 contract address may return null balance fields
- Unsupported chain name returns an error or empty response
- Network/RPC timeout causes delayed or failed response
- Token contract with non-standard decimals may produce unexpected balance values
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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