# Native Coin Balance Lookup (ETH/POL) via eth_getBalance

> 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.

## Facts

- Endpoint: GET https://biosfera.46-62-215-147.sslip.io/o/native-balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/native-coin-balance-lookup-eth-pol-via-eth-getbalance-abffba6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7sTYNPgfQkx_EwHmymzDq

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability native-coin-balance-lookup-eth-pol-via-eth-getbalance-abffba6b
```

Example prompt: What's the current ETH balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet — give me both the exact wei amount and the readable decimal value?

## When to prefer this

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.

## Known failure modes

- 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

## 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).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "address"
     ],
     "properties": {
      "chain": {
       "enum": [
        "base",
        "ethereum",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "type": "string"
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/native-coin-balance-lookup-eth-pol-via-eth-getbalance-abffba6b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from biosfera.46-62-215-147.sslip.io](https://www.zero.xyz/host/biosfera.46-62-215-147.sslip.io/llms.txt)