# x402engine Wallet Balance Lookup

> x402engine Wallet Balance Lookup is a paid API for AI agents from x402engine.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-29).

Returns token balances for a given wallet address on a specified blockchain (EVM, Solana, Bitcoin, 20+ chains)

## Facts

- Endpoint: POST https://x402engine.app/api/wallet/balances?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402engine-wallet-balance-lookup-9ef0d1b3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gdlYnjoODeSyi-SvZbmfl

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 x402engine-wallet-balance-lookup-9ef0d1b3 -d '<json body>'
```

Example prompt: What are the token balances for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum?

## When to prefer this

Use this endpoint when you need real-time on-chain token balance data for a specific wallet address on one of 20+ supported chains including EVM-compatible chains (Ethereum, Polygon, Base, Arbitrum), Solana, and Bitcoin. Prefer this over blockchain RPC calls when you want a simple, pay-per-use abstraction without managing node infrastructure or API keys.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Unsupported chain name returns an error or empty result
- Network timeouts for congested chains
- Address with zero balance returns empty token list
- Incorrect address format for the specified chain (e.g. EVM address on Solana)

## How this service works

Token balances for any wallet across 20+ chains — EVM, Solana, Bitcoin

## Output

Returns token balance data for the specified wallet address on the requested chain, including token names, amounts, and potentially contract addresses or decimals for each held token.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body",
    "method"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "chain",
      "address"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "example": "ethereum",
       "description": "Chain name (ethereum, polygon, base, arbitrum, etc.)"
      },
      "address": {
       "type": "string",
       "example": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
       "description": "Wallet address"
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402engine-wallet-balance-lookup-9ef0d1b3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402engine.app](https://www.zero.xyz/host/x402engine.app/llms.txt)