# Multi-Chain Wallet Token Balance Lookup

> Multi-Chain Wallet Token Balance Lookup is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.005000/call, status unknown (last checked 2026-09-14, last successful call 2026-05-28).

Returns token balances for any wallet address across 20+ blockchain networks including EVM chains, Solana, and Bitcoin

## Facts

- Endpoint: POST https://x402-gateway-production.up.railway.app/api/wallet/balances
- Price: $0.005000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Last successful call: 2026-05-28
- Success rate: 100% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-production-up-railway-app-9c569da0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7cy7oIOueq6YWdY4Ahqxj

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-gateway-production-up-railway-app-9c569da0 -d '<json body>'
```

Example prompt: What are all the token balances for wallet 0x742d35Cc6634C0532925a3b8D4C9B4e1F2c3A7d9 across every chain you can check — EVM, Solana, and Bitcoin?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-chain view of a wallet's token holdings in a single call, especially when the wallet may hold assets across EVM-compatible chains, Solana, and Bitcoin simultaneously. Ideal for portfolio aggregation, DeFi dashboards, or pre-transaction balance checks.

## Known failure modes

- Invalid wallet address format returns an error
- Unsupported chain or address type returns empty or error response
- Wallet with no balances returns empty result set
- Network timeouts on specific chains may cause partial results
- Malformed POST body returns 400-level error

## How this service works

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

## Output

A structured response listing token balances across 20+ supported chains, including token symbols, amounts, and the associated chain for each holding found in the wallet.

## Example request

```json
{
 "chain": "ethereum",
 "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
```

## 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/x402-gateway-production-up-railway-app-9c569da0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-gateway-production.up.railway.app](https://www.zero.xyz/host/x402-gateway-production.up.railway.app/llms.txt)