# Agent Chain Kit – Native Balance

> Agent Chain Kit – Native Balance is a paid API for AI agents from built-with-productos-voo8.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

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

## Facts

- Endpoint: GET https://built-with-productos-voo8.vercel.app/v1/native-balance
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-chain-kit-native-balance-4eb70208
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XLJvIznIRZ3WP_DxSG21y

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 agent-chain-kit-native-balance-4eb70208
```

Example prompt: What's the current native ETH balance on Base for the wallet 0xAbCd1234...5678?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call native token balance lookup across major EVM networks (Ethereum, Base, Arbitrum, Polygon) without maintaining your own RPC infrastructure. It is ideal for AI agents or automation pipelines that need on-demand balance data at low per-call cost, especially when multi-RPC failover reliability matters.

## Known failure modes

- Invalid address format (not a valid 0x hex address) returns a validation error
- Unsupported network value outside the allowed enum returns a 400-level error
- RPC provider outage may cause delays or 5xx errors (multi-RPC failover mitigates this)
- Payment not completed or insufficient USDC causes 402 Payment Required response
- Missing required `address` query parameter returns a 400 error

## How this service works

Pay-per-call EVM utility API for AI agents and automation.

## Output

Returns a JSON object with the queried wallet address, the resolved network name, the raw balance in wei as a string, and the human-readable native token balance as a decimal number.

## 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/agent-chain-kit-native-balance-4eb70208/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from built-with-productos-voo8.vercel.app](https://www.zero.xyz/host/built-with-productos-voo8.vercel.app/llms.txt)