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Base Wallet Quick Check (ETH + USDC + Gas Bundle)
x402
Base Wallet Quick Check (ETH + USDC + Gas Bundle) 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, live ERC-20 transfer gas cost, and can_pay_gas/can_pay_x402 flags for a Base wallet in a single call.
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 address, chain ('base'), native ETH balance, USDC balance, account nonce, live gas cost of an ERC-20 transfer in ETH, a can_pay_gas boolean (true if ETH covers gas), and a can_pay_x402 boolean (true if USDC balance is sufficient for an x402 payment).
Example use cases
Agent self-check before x402 payment
“Check my agent wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base and tell me if it has enough ETH for gas and enough USDC to cover an x402 micropayment before I proceed.”
Counterparty wallet pre-flight validation
“Before I send USDC to 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B, quickly verify their Base wallet — check their ETH and USDC balances, their nonce, and whether they can receive a gas-paying ERC-20 transfer.”
Automated payment gateway wallet monitor
“Pull the current ETH balance, USDC balance, gas cost, and readiness flags for wallet 0x1234567890abcdef1234567890abcdef12345678 on Base so I can decide whether to top it up before the next scheduled payout.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/portfolio?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need ETH balance, USDC balance, nonce, and gas cost for a Base wallet all at once and want to avoid 2-3 separate API calls. At $0.003 it is cheaper than calling eth-balance + erc20-balance + base-gas individually ($0.006 combined). Ideal for pre-payment checks in autonomous agent workflows, x402 payment pipelines, or any onchain automation that must confirm wallet readiness before executing a transaction.
Side effects
- Invalid wallet address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error
- Wallet exists but has zero balances — returns all zeroes with can_pay_gas=false and can_pay_x402=false (not an error, but may mislead if not distinguished from lookup failure)
- Network congestion on Base may cause stale or slow gas estimates
- Payment for the API call itself fails (insufficient USDC for x402 fee) — call is rejected before executing
- Workers.dev service downtime returns 5xx errors
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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