# OneSource Live Wallet Balance (ETH + ERC20)

> OneSource Live Wallet Balance (ETH + ERC20) is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the native ETH balance plus balances of any specified ERC20 tokens for a given Ethereum wallet address in a single API call.

## Facts

- Endpoint: GET https://api.onesource.io/api/chain/live-balance
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/onesource-live-wallet-balance-eth-erc20-f94e695e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xNRvhW_iXNM28L4qg5vmA

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 onesource-live-wallet-balance-eth-erc20-f94e695e
```

Example prompt: What's the live balance of Ethereum wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on mainnet — give me both its ETH balance and its USDC and DAI token balances?

## When to prefer this

Use this endpoint when you need both native ETH and multiple ERC20 token balances for a wallet in a single call, rather than making separate calls for each token. Prefer this over single-token balance endpoints when checking portfolio state, monitoring wallet activity, or verifying that a wallet holds sufficient funds across multiple asset types.

## Known failure modes

- Invalid Ethereum address format (must be 0x-prefixed 40 hex chars) returns validation error
- Invalid or unrecognized token contract address returns zero or error for that token
- Unsupported network value (not 'ethereum' or 'sepolia') returns 400 error
- Network RPC node unavailable returns 503 or timeout
- Wallet address is valid but has zero balances — returns 0 for all fields
- Payment not made or x402 auth missing returns 402 Payment Required

## How this service works

Live wallet balance - native ETH plus up to 20 caller-supplied ERC20 tokens in one bounded RPC batch

## Output

Returns the native ETH balance (via eth_getBalance) and the balances of any specified ERC20 token contracts (via balanceOf eth_call) for the given wallet address, all in a single response. Balances are live and reflect the current on-chain state on either Ethereum mainnet or Sepolia testnet.

## Example request

```json
{
 "tokens": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,0x6B175474E89094C44Da98b954EedeAC495271d0F",
 "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
 "network": "ethereum"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "tokens": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}(,0x[a-fA-F0-9]{40}){0,19}$",
       "maxLength": 859
      },
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$"
      },
      "network": {
       "enum": [
        "ethereum",
        "sepolia",
        "robinhood"
       ],
       "type": "string",
       "default": "ethereum"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "data",
      "meta"
     ],
     "properties": {
      "data": {
       "type": "object",
       "properties": {
        "tokens": {
         "type": "array",
         "items": {
          "type": "object",
          "properties": {
           "symbol": {
            "type": "string"
           },
           "balance": {
            "type": "string"
           },
           "contract": {
            "type": "string"
           },
           "decimals": {
            "type": "integer"
           }
          }
         }
        },
        "address": {
         "type": "string"
        },
        "eth_balance": {
         "type": "string"
        }
       },
       "description": "Endpoint-specific response payload"
      },
      "meta": {
       "type": "object",
       "required": [
        "endpoint",
        "request_id"
       ],
       "properties": {
        "endpoint": {
         "type": "string"
        },
        "cost_usdc": {
         "type": "string"
        },
        "request_id": {
         "type": "string"
        },
        "payment_chain": {
         "type": "string"
        },
        "payment_token": {
         "type": "string"
        }
       }
      },
      "error": {
       "type": [
        "object",
        "null"
       ],
       "properties": {
        "code": {
         "type": "in
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "tokens": [
    {
     "symbol": "USDT",
     "balance": "0x499602d2",
     "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7",
     "decimals": 6
    }
   ],
   "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
   "eth_balance": "0xde0b6b3a7640000"
  },
  "meta": {
   "endpoint": "/api/chain/live-balance",
   "cost_usdc": "0.001",
   "request_id": "00000000abcdef01",
   "payment_chain": "base",
   "payment_token": "USDC"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/onesource-live-wallet-balance-eth-erc20-f94e695e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.onesource.io](https://www.zero.xyz/host/api.onesource.io/llms.txt)