# Agent Tollgate Engine – Wallet Balance Lookup

> Agent Tollgate Engine – Wallet Balance Lookup is a paid API for AI agents from skinwinking.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).

Returns the native token balance and SPL/ERC-20 token holdings for a given wallet address on a specified blockchain.

## Facts

- Endpoint: GET https://skinwinking.com/api/v1/data/wallet-balance?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-tollgate-engine-wallet-balance-lookup-28a377a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gnfz_WNFKRpEkXyem7nQ2

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 agent-tollgate-engine-wallet-balance-lookup-28a377a8
```

Example prompt: What is the current balance of wallet address EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v on Solana — show me both the native SOL amount and any tokens it holds?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call balance check across Solana, Ethereum, Base, Polygon, or Arbitrum without setting up your own RPC node. It is ideal for AI agents that need on-demand wallet snapshots as part of a broader workflow (e.g. checking balances before routing a swap) and want to pay micro-fees in USDC rather than maintaining an API subscription.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Unsupported chain value causes a 400-level error
- Address with zero activity may return empty token arrays
- Network-level timeout or RPC unavailability causes failure
- Payment not processed (x402) prevents the call from completing

## How this service works

50 pay-per-call tools for agents over x402 (USDC on Base, Polygon, Solana): crypto market data, token audits, indicators, swap routing, web extraction, DNS/WHOIS/email checks, FX, weather and AI text/image tools.

## Output

Returns a JSON object with a 'native' field containing the native token amount and symbol (e.g. SOL, ETH, MATIC), and a 'tokens' array listing each held token's mint/contract address and amount.

## 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": [
      "chain",
      "address"
     ],
     "properties": {
      "chain": {
       "enum": [
        "solana",
        "ethereum",
        "base",
        "polygon",
        "arbitrum"
       ],
       "type": "string",
       "description": "One of solana, ethereum, base, polygon, arbitrum"
      },
      "address": {
       "type": "string",
       "description": "Wallet address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "native": {
   "amount": 0.0046,
   "symbol": "SOL"
  },
  "tokens": [
   {
    "mint": "EPjF...",
    "amount": 1.5
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-tollgate-engine-wallet-balance-lookup-28a377a8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from skinwinking.com](https://www.zero.xyz/host/skinwinking.com/llms.txt)