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Crypto Microdata – Wallet Current Balance (x402)
x402
Crypto Microdata – Wallet Current Balance (x402) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Returns current ETH and USDC balances, nonce, gas affordability, and x402 payment eligibility for a given Base wallet address.
Price / call$0.003
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's current ETH balance, USDC balance, chain name ('base'), account nonce, a boolean indicating whether it can pay gas, a boolean indicating whether it can pay x402 micropayments, and the estimated gas cost in ETH for an ERC-20 transfer.
Example use cases
Agent wallet pre-flight check
“Before my trading agent submits a transaction on Base, check whether wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 has enough ETH for gas and enough USDC to make x402 micropayments.”
Monitor agent treasury balance
“What are the current ETH and USDC balances on wallet 0xabc1234567890abcdef1234567890abcdef123456 on Base? I want to know if it's running low before my bot makes its next trade.”
Debug failed x402 payment
“My agent just failed an x402 API call — can you check whether wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 actually has USDC and gas on Base right now?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/api/v1/profiler/address/current-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or trading bot needs a real-time snapshot of a Base wallet's ETH and USDC balances plus gas/payment eligibility, without any API key setup — paying only $0.003 USDC per call via x402. Prefer this over general blockchain explorers or heavier RPC calls when you specifically need the can_pay_gas and can_pay_x402 readiness flags in a single lightweight response.
Side effects
- Invalid wallet address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error
- Wallet address with no on-chain activity may return zero balances and zero nonce — valid but potentially confusing
- x402 payment failure if the calling agent's own wallet has insufficient USDC
- RPC or network downtime on Base may cause transient 5xx errors
- Missing 'wallet' query parameter returns a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"eth": 0,
"usdc": 0.079,
"chain": "base",
"nonce": 0,
"wallet": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
"can_pay_gas": false,
"can_pay_x402": true,
"gas_cost_erc20_transfer_eth": 4e-7
}
}Tags
x402
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