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Base Chain Wallet Balance Lookup
x402
Base Chain Wallet Balance Lookup is a paid API for AI agents from lin-desk-x402.lindesk.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Returns the ETH and USDC balance of any Ethereum address on Base mainnet, including block number and contract detection.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call API for AI agents: turn any public web page or PDF into clean, LLM-ready Markdown. $0.002 per call in USDC on Base via x402. No API key, no signup.
Output
A JSON object containing the wallet's ETH balance (human-readable and in wei), USDC balance (human-readable and raw), the block number and timestamp of the reading, whether the address is a contract, the chain ID (8453 for Base), and a disclaimer that the data is read-only and not financial advice.
Example use cases
DeFi agent portfolio check
“Look up the current ETH and USDC balances for the address 0xAbCd1234...5678 on Base mainnet — I want to know if it's a contract and what block the data is from.”
Payment verification before transfer
“Before I send funds, can you check the USDC balance of 0x1234abcd...ef56 on Base so I know the recipient's current balance?”
On-chain audit of agent wallet
“Pull the on-chain ETH and USDC balance for my agent's wallet 0xDEAD...BEEF on Base mainnet and tell me the block number the reading is from.”
Technical details
Endpoint
GEThttps://lin-desk-x402.lindesk.workers.dev/v1/base/balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call on-chain balance check for any Base mainnet address without requiring API key registration. It is ideal for AI agents that need to verify wallet balances programmatically and pay micro-amounts per lookup via x402/USDC. Prefer it over full blockchain indexers when you only need current ETH and USDC balances for a single address and want minimal setup overhead.
Side effects
- Invalid address format (not matching 0x + 40 hex chars) returns a validation error
- Address not found or zero-balance wallets return balances of 0 rather than an error
- Network congestion on Base may cause increased latency
- Payment failure via x402 prevents the request from being processed
- RPC node downtime may cause lookup failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"eth": "1",
"usdc": "0",
"as_of": 1791100000,
"chain": "base",
"cached": false,
"address": "0x4200000000000000000000000000000000000006",
"eth_wei": "1000000000000000000",
"chain_id": 8453,
"usdc_raw": "0",
"disclaimer": "Read-only on-chain data; not financial advice.",
"elapsed_ms": 45,
"is_contract": true,
"block_number": 52120000,
"usdc_contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"
}
}Tags
x402
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