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ETH Mainnet ERC-20 Balance
x402
ETH Mainnet ERC-20 Balance is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Reads the raw ERC-20 token balance for a given holder address on Ethereum mainnet by calling the balanceOf function on the token contract.
Price / call$0.002
Success—
StatusUnknown
How this service works
Ethereum mainnet ERC-20 balanceOf. Takes query parameters token (ERC-20 contract, 0x + 40 hex) and address (holder, 0x + 40 hex). Returns the holder's raw token balance read from the contract.
Output
Returns the raw uint256 token balance of the specified holder address as reported by the ERC-20 contract's balanceOf function on Ethereum mainnet. The value is in the token's smallest unit (e.g. 6 decimals for USDC, 18 for most tokens) and must be divided by the token's decimal factor to get a human-readable amount.
Example use cases
DeFi portfolio tracker balance check
“Can you look up how many USDT tokens the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 holds on Ethereum mainnet? The USDT contract address is 0xdAC17F958D2ee523a2206206994597C13D831ec7.”
Airdrop eligibility verification
“Before I submit this airdrop claim, can you verify whether 0x742d35Cc6634C0532925a3b844Bc454e4438f44e actually holds any of the governance token at 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 on Ethereum mainnet?”
On-chain payment confirmation
“I'm expecting a payment in WETH to my address 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B — can you check my current WETH balance at contract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Ethereum mainnet so I know if it arrived?”
Technical details
Endpoint
GEThttps://ari001.tailb4ac3a.ts.net/v1/ventures/x402_eth_reads_v1/eth_mainnet_erc20_balanceof?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to read the ERC-20 token balance for a specific holder on Ethereum mainnet directly from the contract. Prefer this over block explorer APIs when you need trustless, on-chain data without API key management, or when building automated agents that need real-time balance checks. This is a read-only call with no side effects and costs a flat $0.002 USDC per call via x402.
Side effects
- Invalid token address format (not 0x + 40 hex) — request rejected with validation error
- Invalid holder address format (not 0x + 40 hex) — request rejected with validation error
- Non-ERC-20 contract address provided — call may return zero or revert
- Payment not fulfilled — x402 payment of $0.002 USDC required before response is returned
- Ethereum node unavailable or rate-limited — may return 5xx error
- Address with no token holdings returns 0, which is valid not an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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