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x402-audit Wallet Balance (ETH/ERC-20)
x402
x402-audit Wallet Balance (ETH/ERC-20) is a paid API for AI agents from x402-audit.tatschluizguilherme.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-02).
Returns the native ETH or ERC-20 token balance of any wallet address on Base, Optimism, or Ethereum Mainnet, including decimals, formatted value, and current block number — without relying on a block explorer API.
Price / call$0.1
Success—
StatusUnknown
How this service works
Pay-per-call on-chain API for AI agents and developers: wallet audits, token safety audits (honeypot detection), live gas prices, token prices, transaction receipts, balances, ENS resolution, block data, ERC-20 allowances, transaction simulation, swap quotes and multicall batches — all computed on-chain via public RPCs (no external market API). Pay per request in USDC on Base via the x402 exact scheme (EIP-3009 transferWithAuthorization). No API key, no signup, no subscription.
Output
Returns raw balance (in the token's smallest unit), formatted balance (as a human-readable decimal string), token decimals, and the block number at which the balance was read. For native ETH queries no token address is needed; for ERC-20 tokens the contract address is required.
Example use cases
Pre-transaction balance check
“Before I send this swap transaction, can you check how much USDC wallet 0xAbC...123 currently holds on Base so I know there are sufficient funds?”
Portfolio audit across networks
“What's the ETH balance of 0xDef...456 on Ethereum Mainnet right now, including the block number and formatted value?”
Token eligibility verification
“Can you verify whether address 0x789...abc holds at least 100 of token 0xTokenAddr...xyz on Optimism so I can check if they qualify?”
Technical details
Endpoint
GEThttps://x402-audit.tatschluizguilherme.workers.dev/balance?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need a direct on-chain balance read for ETH or any ERC-20 token on Base, Optimism, or Ethereum Mainnet without going through a centralized block explorer like Etherscan. Ideal for pre-flight checks before transactions, balance-based eligibility gates, or portfolio monitoring in an automated agent pipeline. Use it when you need the precise formatted value plus the block number for auditability.
Side effects
- Invalid or malformed wallet address returns an error or zero balance
- Unsupported network identifier causes a request failure
- Invalid ERC-20 contract address returns an error
- RPC/node connectivity issue causes a timeout or 500 error
- Querying a non-existent token contract may return zero or revert
Output
Schema · Response
{
"type": "json",
"example": {
"token": null,
"native": true,
"symbol": "ETH",
"address": "0x8e8d53a67b59E6f2A28e0d6d52012A2b0e3E1886",
"network": "base",
"decimals": 18,
"balanceWei": "194087918645289",
"blockNumber": 24400123,
"balanceFormatted": "0.00019408"
}
}Tags
x402
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