# Ethereum Mainnet ETH Balance Lookup

> Ethereum Mainnet ETH Balance Lookup is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns the native ETH balance of an Ethereum address in wei, ETH, and optionally USD value via LlamaRPC

## Facts

- Endpoint: GET https://api.x402node.dev/chain/eth-balance
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-x402node-dev-6187ed49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0CQzj_EhBTEW2XcIHCu2L

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 api-x402node-dev-6187ed49
```

Example prompt: What's the current ETH balance of wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — show me the amount in both ETH and USD?

## When to prefer this

Use this endpoint when you need on-chain native ETH balance for a specific Ethereum mainnet address without setting up your own RPC node or API key. Ideal for AI agents doing portfolio reporting, wallet onboarding checks, or fraud screening where a quick wei/ETH/USD balance lookup is needed. Prefer over manual RPC calls for convenience and built-in USD conversion.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- LlamaRPC upstream outage causes timeout or 5xx
- USD price feed unavailable when with_usd=true requested
- Non-checksum address format may be rejected
- Rate limiting or payment failure at x402 layer

## How this service works

Ethereum mainnet native ETH balance for an address via LlamaRPC (no API key). Returns wei, eth, and optional USD value. Use ?address=0x... and with_usd=true. Built for AI agents doing portfolio reporting, fraud screening, and wallet onboarding. Accepts payment on Base or Solana — either network works.

## Output

A JSON object containing the queried Ethereum address, its balance in wei (raw), its balance in ETH (human-readable), and optionally its current USD equivalent value based on live pricing.

## Example request

```json
{
 "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
 "with_usd": true
}
```

## 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",
     "properties": {
      "address": {
       "type": "string",
       "description": "EVM/chain address (optional)"
      },
      "with_usd": {
       "type": "string",
       "description": "With_usd (optional)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-x402node-dev-6187ed49/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)