# x402 Wallet Balance & Activity Lookup

> x402 Wallet Balance & Activity Lookup is a paid API for AI agents from x402-tools-production-2755.up.railway.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Resolve an Ethereum address or ENS name and return ETH and USDC balances plus transaction counts on Ethereum mainnet and Base.

## Facts

- Endpoint: GET https://x402-tools-production-2755.up.railway.app/tools/wallet?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-wallet-balance-activity-lookup-20cdbbf6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BZTXJtj7Vyn8ECjvaZDKm

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 x402-wallet-balance-activity-lookup-20cdbbf6
```

Example prompt: What are the ETH and USDC balances for vitalik.eth on both Ethereum and Base, and how many transactions has that wallet made?

## When to prefer this

Use this endpoint when you need a quick multi-chain balance snapshot (ETH + USDC) across both Ethereum mainnet and Base for a single address or ENS name. It is ideal for pre-transaction due diligence, counterparty vetting, or portfolio checks where you need both chains in one call. Prefer this over generic blockchain explorers when you specifically need ETH and USDC balances plus tx counts on both Ethereum and Base simultaneously without additional API setup.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- ENS name that cannot be resolved returns a resolution failure
- Unrecognized address format causes a validation error
- Rate limiting or upstream RPC node unavailability may cause timeouts
- Address with no activity returns zero balances and zero tx counts (valid but empty result)

## How this service works

Resolve an address or ENS name and return ETH and USDC balances and tx counts on Ethereum and Base.

## Output

Returns ETH balance, USDC balance, and transaction count for the given address or ENS name on both Ethereum mainnet and Base chain, giving a cross-chain financial snapshot of the wallet.

## 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",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "0x address or ENS name"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-wallet-balance-activity-lookup-20cdbbf6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-tools-production-2755.up.railway.app](https://www.zero.xyz/host/x402-tools-production-2755.up.railway.app/llms.txt)