# Xerxes Ethereum ETH Balance Lookup

> Xerxes Ethereum ETH Balance Lookup is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Returns the Ether balance (in wei and hex) of a given Ethereum address as of the latest block via eth_getBalance RPC.

## Facts

- Endpoint: GET https://ari001.tailb4ac3a.ts.net/v1/ventures/ethereum_rpc_api/eth_getbalance?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xerxes-ethereum-eth-balance-lookup-8ebb76e7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LkPK-zyHtSiYRymxoxS2j

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 xerxes-ethereum-eth-balance-lookup-8ebb76e7
```

Example prompt: What's the current ETH balance of the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045?

## When to prefer this

Use this endpoint when you need a live, mainnet ETH balance for a specific Ethereum address and want a minimal, direct RPC lookup without additional token data. Prefer this over ERC-20 balance endpoints when you need native Ether (not token) balance, and over block explorers when you need a programmatic, agent-callable response with structured JSON output including hex and integer wei values.

## Known failure modes

- Invalid address format (not matching ^0x[a-fA-F0-9]{40}$) returns an error response
- Address not found or zero-balance address returns 0x0 (not an error)
- RPC node unavailability or timeout returns ok: false with an error message
- Rate limiting or payment failure (x402) blocks the request

## How this service works

Returns the Ether balance of a given address on the Ethereum mainnet, as of the latest block. This is a direct RPC call to eth_getBalance with the address parameter. Query: address (0x + 40 hex).

## Output

Returns a JSON object with: ok (boolean success flag), hex (ETH balance as a hex string in wei), result (ETH balance as an integer in wei), chain (network identifier, e.g. 'ethereum'), method (RPC method name 'eth_getBalance'), and an error string if ok is false.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "0x + 40 hex"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "service"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "hex": {
       "type": [
        "string",
        "null"
       ]
      },
      "chain": {
       "type": "string"
      },
      "error": {
       "type": "string",
       "description": "present when ok is false"
      },
      "method": {
       "type": "string"
      },
      "result": {
       "type": "integer"
      },
      "service": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xerxes-ethereum-eth-balance-lookup-8ebb76e7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ari001.tailb4ac3a.ts.net](https://www.zero.xyz/host/ari001.tailb4ac3a.ts.net/llms.txt)