# EVM Native Balance Lookup

> EVM Native Balance Lookup is a paid API for AI agents from built-with-productos-xszv.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

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

## Facts

- Endpoint: GET https://built-with-productos-xszv.vercel.app/v1/native-balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-native-balance-lookup-bfd41874
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H0OcSjOUsySaL-Rjq_91K

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-bfd41874
```

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

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call on-chain native balance read across Ethereum, Base, Arbitrum, or Polygon without setting up an RPC provider or managing API keys. Ideal for AI agents that need sporadic, trustless balance checks without infrastructure overhead. Prefer this over full node RPC calls when cost predictability and simplicity matter.

## Known failure modes

- Invalid address format (not a 0x-prefixed 40-character hex string) returns a validation error
- Unsupported network value (outside ethereum/base/arbitrum/polygon) returns an enum error
- Network RPC unavailability may cause timeout or 503 errors
- Payment failure via x402/MPP returns 402 Payment Required before the balance is returned
- Zero-balance wallets return successfully with balance_wei of '0'

## 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

A JSON object containing the queried wallet address, the network name, the balance expressed in wei (as a string to avoid precision loss), and the balance in native token units 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/evm-native-balance-lookup-bfd41874/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from built-with-productos-xszv.vercel.app](https://www.zero.xyz/host/built-with-productos-xszv.vercel.app/llms.txt)