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Joe EVM RPC – Live Balance
x402
Joe EVM RPC – Live Balance is a paid API for AI agents from joe-evm-rpc.marnick-yezo.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Fetches the live native ETH balance and optional ERC-20 token balances for a given wallet address on Base or Ethereum mainnet.
Price / call$0.001
Success—
StatusUnknown
How this service works
Live Base and Ethereum RPC for AI agents: block tip, balances, transactions, and ENS. $0.001 USDC per call on Base.
Output
Returns a JSON object containing the wallet's native ETH balance in hex, an array of ERC-20 token balances (each with symbol, hex balance, contract address, and decimals), plus metadata including the RPC endpoint used, network name, cost in USDC, and a unique request ID.
Example use cases
DeFi portfolio snapshot for a wallet
“Can you check the live ETH balance and USDC balance on Base for my wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045? The USDC contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Verify payment received on-chain
“Did the wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B receive any USDC on Base yet? Check its current USDC balance at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Ethereum mainnet balance check
“Look up the current ETH balance for address 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum mainnet — I need the raw on-chain balance right now.”
Technical details
Endpoint
GEThttps://joe-evm-rpc.marnick-yezo.workers.dev/api/chain/live-balanceWhen to prefer
Choose this endpoint when an AI agent needs real-time, on-chain wallet balances on Base or Ethereum mainnet with per-call micropayment pricing ($0.001 USDC via x402), without needing API keys or subscriptions. It is ideal for agents that need to check ETH and multiple ERC-20 balances in a single call. Prefer it over general-purpose Ethereum node providers when operating in a pay-per-use, agent-native context where x402 payment rails are already available.
Side effects
- Invalid wallet address format (not a valid 0x hex address) — request rejected at schema validation
- Invalid ERC-20 token contract address — token entry may return zero or error
- Network not supported — only 'base' and 'ethereum' are valid; other values rejected
- Payment failure — x402 micropayment of $0.001 USDC not settled, request blocked
- RPC upstream timeout — underlying Base/Ethereum node unreachable, 502/504 error
- More than 20 token addresses supplied — schema validation error
- No response for a brand-new wallet with no on-chain history — balances returned as 0x0
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"tokens": [
{
"symbol": "USDC",
"balance": "0x0",
"contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": 6
}
],
"address": "0x0000000000000000000000000000000000000000",
"eth_balance": "0x0"
},
"meta": {
"rpc": "https://mainnet.base.org",
"network": "base",
"endpoint": "/api/chain/live-balance",
"cost_usdc": "0.001",
"request_id": "00000000abcdef01"
}
}
}Tags
x402
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