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Crypto Microdata – Wallet Portfolio (x402)
x402
Crypto Microdata – Wallet Portfolio (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 ETH balance, USDC balance, nonce, gas affordability, and x402 payment capability for a given Base wallet address, payable via USDC micropayment.
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 chain name ('base'), the queried wallet address, ETH balance (float), USDC balance (float), wallet nonce (integer), a boolean indicating whether the wallet can pay gas (can_pay_gas), a boolean indicating whether the wallet can pay x402 micropayments (can_pay_x402), and the estimated ETH cost of an ERC20 transfer (gas_cost_erc20_transfer_eth).
Example use cases
Pre-flight agent wallet check
“Before my trading bot executes the next swap, check wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base — does it have enough ETH for gas and enough USDC to cover x402 API calls?”
Onchain agent funding monitor
“I need to know if my agent wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 is still funded — what's the current ETH and USDC balance on Base and can it still pay for micropayment API calls?”
New wallet readiness verification
“I just funded a new Base wallet at 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 — can you confirm whether it has enough ETH to pay gas and USDC to start making x402 payments?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/api/wallet-portfolio?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent on Base needs a lightweight, no-API-key pre-flight check of a wallet's ETH gas reserves, USDC holdings, nonce, and x402 payment readiness before executing onchain transactions or calling other pay-per-call microdata APIs. It is ideal for agentic loops that need to self-assess funding status cheaply ($0.003 USDC per call) without a traditional API subscription.
Side effects
- Invalid wallet address format returns a validation error (must match ^0x[0-9a-fA-F]{40}$)
- Missing wallet query parameter returns a 400 bad request
- Insufficient USDC payment for x402 toll returns a 402 Payment Required before data is served
- Cloudflare Worker cold start may add minor latency
- Wallet with zero balances returns all zeros but no error
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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