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OneSource Live Wallet Balance (ETH + ERC20)
x402
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.
Price / call$0.003
Success—
StatusUnknown
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 use cases
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?”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/live-balanceWhen to prefer
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.
Side effects
- 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
Input
{
"tokens": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,0x6B175474E89094C44Da98b954EedeAC495271d0F",
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"network": "ethereum"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"data": {
"tokens": [
{
"symbol": "USDC",
"balance": "0x0000000000000000000000000000000000000000000000000000000001daf661",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"decimals": 6
},
{
"symbol": "DAI",
"balance": "0x0000000000000000000000000000000000000000000000003f7348f736b499b0",
"contract": "0x6B175474E89094C44Da98b954EedeAC495271d0F",
"decimals": 18
}
],
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"eth_balance": "0x4ef2d23eda616ea6"
},
"meta": {
"endpoint": "/api/chain/live-balance",
"request_id": "d4ba7a71fb41ac18"
}
}Schema · Response
{
"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"
}
}
}Tags
x402
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