# EVM Wallet Native Balance Lookup

> EVM Wallet Native Balance Lookup is a paid API for AI agents from chain.cyberwarex.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-03).

Returns the native token balance (ETH, MATIC, etc.) of any EVM wallet address in wei, decimal, symbol, and USD value on a specified chain

## Facts

- Endpoint: GET https://chain.cyberwarex.com/balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-wallet-native-balance-lookup-c3dbc98f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_34zhcnWTxZCbQQvZXg0qL

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 evm-wallet-native-balance-lookup-c3dbc98f
```

Example prompt: What's the current ETH balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base, in both ETH and USD?

## When to prefer this

Choose this endpoint when you need a quick, keyless native token balance check for any EVM-compatible address across Base, Ethereum, Arbitrum, Optimism, or Polygon without managing RPC infrastructure. Ideal for agents that need deterministic JSON wallet snapshots with USD pricing included in a single call. Prefer over raw RPC calls when you lack node access or want normalized output with live USD conversion baked in.

## Known failure modes

- Invalid address format (not matching 0x + 40 hex chars) returns a validation error
- Unsupported chain name returns an enum validation error
- Price feed outage causes usd field to return null while balance data remains valid
- Address with zero balance returns balance: 0 and usd: 0 rather than an error
- Network timeout or upstream RPC failure may return 5xx error

## How this service works

Pay-per-call EVM chain data for agents: wallet snapshots, ERC-20 token profiles, spot prices, gas markets, transaction decode, and ENS resolution across major EVM chains (base, ethereum, arbitrum, optimism, polygon). Deterministic JSON, no RPC keys or node infra needed.

## Output

Returns a JSON object containing the wallet address queried, the chain, the native token symbol (e.g. ETH, MATIC), the balance as a decimal number, the balance in wei as a string, and the current USD value of that balance (null if price feed is unavailable).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "enum": [
        "base",
        "ethereum",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "type": "string",
       "default": "base",
       "description": "EVM chain to query."
      },
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "Wallet or contract address."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "usd": {
       "type": [
        "number",
        "null"
       ],
       "description": "null if the price feed is down"
      },
      "wei": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "symbol": {
       "type": "string"
      },
      "address": {
       "type": "string"
      },
      "balance": {
       "type": "number"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "usd": 4102.77,
  "wei": "1284471203441290000",
  "chain": "base",
  "symbol": "ETH",
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "balance": 1.284471203
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-wallet-native-balance-lookup-c3dbc98f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.cyberwarex.com](https://www.zero.xyz/host/chain.cyberwarex.com/llms.txt)