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Native Coin Balance Lookup (ETH/POL) via eth_getBalance
x402
Native Coin Balance Lookup (ETH/POL) via eth_getBalance is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Returns the exact native coin balance (ETH or POL) of a wallet address on Base, Ethereum, Arbitrum, Optimism, or Polygon, in both raw wei and decimal form with the block number at which it was read.
Price / call$0.001
Success—
StatusUnknown
How this service works
Use when you need the native coin balance (ETH, or POL on Polygon) of an address on Base, Ethereum, Arbitrum, Optimism or Polygon, read live via eth_getBalance. Returns exact wei and decimal value with the block it was read at.
Output
Returns the wallet's native coin balance as an exact integer in wei, a decimal representation (e.g. 1.234 ETH), and the block number at which the balance was read. The coin unit depends on the chain (ETH for Base/Ethereum/Arbitrum/Optimism, POL for Polygon).
Example use cases
Pre-transaction ETH sufficiency check
“Before I send a transaction, can you check whether 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B has enough ETH on Arbitrum to cover the cost — fetch its current native balance in wei and decimal?”
Portfolio native balance monitoring
“What's the current POL balance of 0x1234567890abcdef1234567890abcdef12345678 on Polygon right now, and which block was that read from?”
DeFi protocol liquidity audit
“Can you look up the native ETH balance sitting in the contract at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Base mainnet and tell me both the wei value and the human-readable amount?”
Technical details
Endpoint
GEThttps://biosfera.46-62-215-147.sslip.io/o/native-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need the native coin balance (ETH or POL) of any address — including EOAs, smart contracts, or multisigs — on Base, Ethereum, Arbitrum, Optimism, or Polygon. Prefer this over ERC-20 balance endpoints when the token in question is the chain's native gas token rather than an ERC-20 contract. It is the right choice when you need on-chain real-time data (not a cached or aggregated balance from an explorer) and need the exact wei value alongside the confirming block number.
Side effects
- Invalid address format (not a 0x + 40 hex chars) returns a validation error
- Unsupported chain value outside the allowed enum returns a 400-style error
- Node connectivity issues or RPC downtime may cause transient failures
- Very recently created addresses may return zero balance correctly, not an error
- Missing required query parameters (chain or address) returns a schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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