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Wallet Portfolio Balance Check (Base Chain)
x402
Wallet Portfolio Balance Check (Base Chain) 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 ETH balance, USDC balance, nonce, gas affordability, and x402 payment capability for a given Base wallet address
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
A JSON object containing: ETH balance (float), USDC balance (float), chain name ('base'), wallet nonce (integer), a boolean indicating whether the wallet can pay gas for an ERC20 transfer, a boolean indicating whether it can pay x402 micropayments, and the estimated gas cost in ETH for an ERC20 transfer.
Example use cases
Agent self-check before paying
“Before I execute this next step, check my agent wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base to make sure it has enough ETH for gas and enough USDC to make an x402 micropayment.”
Counterparty wallet due diligence
“I'm about to send USDC to wallet 0xAbC1234567890abcdef1234567890ABCDEF12345 — first check if that address has any activity on Base and what its current ETH and USDC balances are.”
Monitor agent wallet funding status
“Tell me if my trading bot's wallet 0xDEADBEEF0000000000000000000000000000DEAD is running low on ETH or USDC on Base so I know if I need to top it up before it runs its next trade.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/wallet-portfolio?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs a fast, no-API-key balance and gas-readiness check for a Base chain wallet, especially in x402-enabled autonomous agent pipelines. Ideal for pre-flight checks before executing onchain transactions, validating counterparty wallets before payment, or monitoring agent wallet funding levels. Prefer this over full blockchain explorers when you only need balance + gas + x402 affordability signals in a single lightweight call.
Side effects
- Invalid wallet address format (not matching ^0x[0-9a-fA-F]{40}$) — returns validation error
- Wallet address not found or has zero activity — returns zeroed balances rather than error
- x402 payment failure if calling agent lacks USDC to pay the $0.003 fee — returns 402 Payment Required
- RPC/node connectivity issues on Base chain causing stale or unavailable data
- Rate limiting or worker capacity limits under high load
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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