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Base Spend Permission Audit
x402
Base Spend Permission Audit is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Reconstructs a wallet's active Base Account spend permissions from onchain events and flags dangerous ones (unlimited allowance, no expiry, unrecognized spender)
Price / call$0.05
Success—
StatusUnknown
How this service works
🆕 Base Account spend permissions let an app or agent spend a scoped, recurring allowance from a wallet — the primitive behind autonomous agent payments on Base. This reconstructs a wallet's ACTIVE spend permissions from onchain approve/revoke events and flags the dangerous ones: unlimited allowance, no expiry, unrecognized spender. The Base-native, agent-era drain check that ERC-20 approval tools can't see.
Output
A list of active spend permissions reconstructed from onchain approve/revoke events for the wallet, with each permission annotated for risk: whether the allowance is unlimited, whether it has no expiry, and whether the spender address is unrecognized — enabling agents to identify potentially dangerous recurring payment authorizations.
Example use cases
Example prompt
“Check my Base wallet 0x1234...abcd for dangerous spend permissions — flag any that have unlimited allowances, no expiry, or unrecognized spenders.”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/spend-auditWhen to prefer
Use this endpoint when you need to audit Base Account spend permissions specifically — the ERC-20 approval-level tools cannot see these agent-era recurring allowances. Prefer this over generic approval checkers when investigating autonomous agent payment risks, x402 protocol exposure, or Base-native recurring spending grants.
Side effects
- Invalid or malformed wallet address returns 400 error
- Non-Base wallet address yields no results or error
- Onchain data unavailable or RPC timeout returns 500
- No active spend permissions found returns empty result set
- Payment not included or insufficient USDC balance returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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