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Gas Sponsor Check
x402
Gas Sponsor Check is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Analyzes a wallet's ERC-4337 UserOperationEvents across both EntryPoints to determine if it's a smart account, its operation count and success rate, and who sponsors its gas fees (self vs. which paymaster).
Price / call$0.05
Success—
StatusUnknown
How this service works
🆕 A smart account's gas can be paid by a PAYMASTER instead of the account itself — invisible to every 'does this wallet spend ETH' heuristic. Reads a wallet's UserOperationEvents across BOTH EntryPoints (v0.6 + v0.7): is it a smart account, its op count and success rate, and WHO sponsors its gas (self vs which paymaster, per-sponsor share). A fully-sponsored account is typically app- or agent-operated. wallet= required, days= optional (default 30, max 90). Not financial advice.
Output
Returns whether the wallet is a smart account, its total UserOperation count and success rate across EntryPoint v0.6 and v0.7, and a breakdown of who pays its gas: self-funded vs. each sponsoring paymaster with their per-sponsor share of operations.
Example use cases
Detect agent-operated wallet activity
“I need to know if wallet 0x4f3eA...b12c is app- or agent-operated — check if its gas is fully sponsored by a paymaster over the last 60 days and tell me the sponsorship breakdown.”
Smart account due diligence before transfer
“Before I send funds to 0x9aD2...88Fc, can you tell me if it's a smart account, what its UserOp success rate looks like, and whether its gas is self-paid or covered by a third-party paymaster? Look at the last 30 days.”
Audit counterparty gas payment behavior
“I'm screening 0xF7cB...3301 as a potential counterparty — can you pull its ERC-4337 op history and tell me if any paymaster is covering its gas, how often, and what share of ops are sponsored vs self-paid over the past 90 days?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/gas-payerWhen to prefer
Choose this endpoint when you need to determine whether a wallet is a smart account (ERC-4337), who is paying its gas fees, and whether it appears to be app- or agent-operated based on paymaster sponsorship patterns. It is especially useful for counterparty screening, fraud detection, and distinguishing human-operated EOAs from programmatic smart accounts — particularly when native ETH balance heuristics would miss paymaster-subsidized wallets.
Side effects
- Missing wallet parameter returns validation error
- Invalid wallet address format causes a bad request error
- Wallet with no ERC-4337 activity returns empty or zero op count
- Days parameter exceeding 90 is rejected or capped
- Network timeouts when querying both EntryPoints simultaneously
- Non-Base/Ethereum-compatible address may return no results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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