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Wallet Balance & Gas Readiness Checker (x402)
x402
Wallet Balance & Gas Readiness Checker (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 and USDC balances, 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
Returns a JSON object with: ETH balance (float), USDC balance (float), chain name ('base'), nonce (integer), boolean flags can_pay_gas and can_pay_x402, and gas_cost_erc20_transfer_eth (estimated cost in ETH for an ERC-20 transfer). Lets agents instantly assess whether a wallet is ready to transact or pay for x402 services.
Example use cases
Pre-flight check before onchain action
“Before my agent submits that ERC-20 transfer, check wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base — does it have enough ETH for gas and is the nonce correct?”
Verify agent wallet is x402-ready
“My trading agent uses wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 — can you confirm it has USDC to pay for x402 API calls and ETH to cover gas costs on Base?”
Debug why a wallet transaction is failing
“Transaction keeps failing for wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 on Base — check the ETH balance, USDC balance, and nonce to help me figure out what's wrong.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/wallet?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to quickly verify whether a Base wallet is funded and ready to transact — particularly before attempting onchain actions or x402 micropayments. Ideal for pre-flight checks in autonomous agent workflows where gas and payment readiness must be confirmed without setting up API keys. Prefer over manual RPC calls when you want a single structured response covering balances, nonce, gas affordability, and x402 payment capability in one shot for $0.003 USDC.
Side effects
- Invalid wallet address format (must match ^0x[0-9a-fA-F]{40}$) — returns error
- Missing required wallet query parameter — returns 400 or error response
- Payment not received / x402 payment flow failure — returns 402 requiring USDC payment
- RPC timeout or Base network unavailability — may return 503 or partial data
- Wallet with zero balances returns valid response but can_pay_gas=false and can_pay_x402=false
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
Reviews
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