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Base ETH Balance & Nonce Lookup
x402
Base ETH Balance & Nonce Lookup is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Returns the live native ETH balance (in ETH and Wei) plus transaction nonce for a given wallet address on the Base blockchain.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
A JSON object containing the wallet address, native ETH balance as a decimal float and as a Wei string, the current transaction nonce (number of transactions sent), the block number at time of query, and the chain identifier ('base').
Example use cases
Pre-payment counterparty ETH check
“Before I send payment to 0xAbC123...dEf456, check their ETH balance on Base to make sure they have enough to cover gas for the transaction.”
Agent self-balance monitoring
“Check the current native ETH balance and nonce for my agent wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base so I know if I need to top it up.”
Nonce verification before transaction submission
“What's the current nonce for wallet 0x1234567890abcdef1234567890abcdef12345678 on Base? I need to make sure I'm not reusing a transaction sequence number.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/crypto/eth-balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time native ETH balance and nonce data for a Base wallet in a single lightweight call — especially for onchain AI agents doing pre-payment checks, self-monitoring, or counterparty verification on Base L2 specifically. Prefer this over general blockchain explorers when you need machine-readable JSON at $0.002/call via x402 micropayment, and when you specifically need the nonce alongside balance in one response.
Side effects
- Invalid wallet address format (not matching ^0x[0-9a-fA-F]{40}$) returns an error
- Missing wallet query parameter returns a validation error
- Network or RPC unavailability may return a 5xx error
- Payment failure (insufficient USDC for x402 fee) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"block": 53204016,
"chain": "base",
"nonce": 0,
"wallet": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
"balance_eth": 0,
"balance_wei": "0"
}
}Tags
x402
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