# Vextorium Wallet Balance Checker (Base/Ethereum)

> Vextorium Wallet Balance Checker (Base/Ethereum) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).

Returns native ETH plus major token balances (WETH, USDC, USDT, DAI, cbBTC/WBTC, optional ERC-20) for a wallet address on Base or Ethereum, with approximate USD values from Chainlink oracles.

## Facts

- Endpoint: POST https://api.vextorium.com/saldos-wallet-pago?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-wallet-balance-checker-base-ethereum-91af2851
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R1XyQR8G1tbBh14ooA7ni

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 vextorium-wallet-balance-checker-base-ethereum-91af2851 -d '<json body>'
```

Example prompt: Can you pull up all the ETH and major token balances for wallet 0xAbC123...456 on Base, including the approximate USD value for each asset?

## When to prefer this

Choose this endpoint when you need a single-call multi-token balance snapshot for a wallet on Base or Ethereum, especially when you want USD valuations alongside raw balances. It is ideal over single-token RPC calls when you need ETH plus all major stablecoins and wrapped BTC in one response. Prefer it over block explorer APIs when you need Chainlink-priced USD estimates without building your own price-feed logic.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Unsupported network value (not 'base' or 'ethereum') returns a validation error
- Chainlink oracle price unavailable for a token may result in null or zero USD value
- Invalid optional ERC-20 contract address may return null balance or contract read error
- Network timeout or RPC node unavailability causes a service error

## How this service works

Wallet balances on Base or Ethereum in one call: native ETH plus WETH, USDC, USDT, DAI and cbBTC/WBTC (and optionally any extra ERC-20), with approximate USD value from Chainlink oracles.

## Output

Returns a JSON object with the wallet address, chosen network, a list of token balances (each with asset name, contract address or null for native ETH, quantity, and approximate USD value), total portfolio USD value, and a block explorer URL for the address.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "direccion"
     ],
     "properties": {
      "red": {
       "enum": [
        "base",
        "ethereum"
       ],
       "type": "string"
      },
      "token": {
       "type": "string",
       "description": "Optional extra ERC-20 contract"
      },
      "direccion": {
       "type": "string",
       "description": "Wallet address"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "red": {
       "type": [
        "string",
        "null"
       ]
      },
      "nota": {
       "type": [
        "string",
        "null"
       ]
      },
      "saldos": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "object",
         "null"
        ],
        "properties": {
         "activo": {
          "type": [
           "string",
           "null"
          ]
         },
         "cantidad": {
          "type": [
           "number",
           "null"
          ]
         },
         "contrato": {
          "type": [
           "string",
           "null"
          ],
          "description": "Token contract (null for the native coin)"
         },
         "valor_usd_aprox": {
          "type": [
           "number",
           "null"
          ]
         }
        }
       }
      },
      "direccion": {
       "type": [
        "string",
        "null"
       ]
      },
      "explorador": {
       "type": [
        "string",
        "null"
       ]
      },
      "valor_total_usd_aprox": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "saldos": [
   {
    "activo": "ETH",
    "cantidad": 0.002,
    "valor_usd_aprox": 5.38
   },
   {
    "activo": "USDC",
    "cantidad": 0.211,
    "valor_usd_aprox": 0.21
   }
  ],
  "valor_total_usd_aprox": 5.59
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-wallet-balance-checker-base-ethereum-91af2851/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)