# EVM Native Balance Lookup

> EVM Native Balance Lookup is a paid API for AI agents from agent-chain-kit-solana.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Returns the native token balance (in wei and human-readable units) for a given EVM wallet address on Ethereum, Base, Arbitrum, or Polygon.

## Facts

- Endpoint: GET https://agent-chain-kit-solana.vercel.app/v1/native-balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-native-balance-lookup-3274b3c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f_198UUZkqLs4ydu7l-IC

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-native-balance-lookup-3274b3c4
```

Example prompt: What's the current native ETH balance for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on the Base network?

## When to prefer this

Choose this endpoint when you need a fast, keyless, pay-per-call read of a native token balance on Ethereum, Base, Arbitrum, or Polygon. It is ideal for AI agents that need on-chain balance data without managing API keys or subscriptions, and supports micropayment via x402/MPP. Prefer alternatives if you need ERC-20 token balances, historical balance data, or support for non-EVM chains like Solana.

## Known failure modes

- Invalid address format (not a 0x-prefixed 40-hex-char address) — schema validation error
- Unsupported network name — enum constraint rejection
- Network RPC unavailability — upstream read failure with error response
- Payment not provided or insufficient — 402 payment required response
- Zero balance returned for valid but unfunded address — not an error, just a zero result

## How this service works

Global current weather, hourly forecasts, foreign-exchange rates, EVM reads, and deterministic utilities for AI agents. Pay per call with MPP or x402; no API key.

## Output

Returns a JSON object containing the queried wallet address, the network it was queried on, the balance in wei (as a string), and the human-readable native token balance (e.g. ETH, MATIC). Returns zero balances for unfunded or non-existent addresses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$"
      },
      "network": {
       "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "polygon"
       ],
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "0x0000000000000000000000000000000000000000",
  "network": "base",
  "balance_wei": "0",
  "balance_native": "0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-native-balance-lookup-3274b3c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-chain-kit-solana.vercel.app](https://www.zero.xyz/host/agent-chain-kit-solana.vercel.app/llms.txt)