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presign-guard ERC-20 Approval Auditor
x402
presign-guard ERC-20 Approval Auditor is a paid API for AI agents from presign-guard.fizzl.eu, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).
Audits all open ERC-20 token allowances for an EVM wallet, grading each approval and identifying risky, unlimited, or flagged spenders to revoke
Price / call$0.02
Success—
StatusUnknown
How this service works
Wallet approval audit (green/orange/red, grade, one-line summary): every open ERC-20 allowance of an EVM wallet with who the spender is (flagged, plain wallet, unverified, unlimited) and which ones to revoke. Bulk: 100 checks for $0.80 via /v1/credits.
Output
Returns a structured audit with: an overall verdict (green/orange/red), a safety grade (SAFE/CAUTION/RISKY/AVOID), a one-line summary, a list of flagged reason codes with severity levels, and a detailed breakdown of every open ERC-20 allowance including spender address, spender classification (flagged/plain wallet/unverified/unlimited), and revocation recommendations. Also includes a signed receipt for payment verification.
Example use cases
DeFi wallet security check
“Audit my Base wallet 0x71C7656EC7ab88b098defB751B7401B5f6d8976F for all open ERC-20 approvals — I want to know which spenders are flagged or have unlimited access so I know what to revoke.”
Post-phishing incident triage
“I think my Polygon wallet 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD might have been compromised — can you scan all its token allowances and give me a red/orange/green risk grade plus a list of suspicious approvals to revoke?”
Pre-DeFi protocol review
“Before I start using this new Arbitrum DEX, can you check my wallet 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97 on Arbitrum and tell me what existing token approvals I have outstanding and whether any look risky or unlimited?”
Technical details
Endpoint
GEThttps://presign-guard.fizzl.eu/v1/approvals?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, structured audit of all ERC-20 allowances for a specific EVM wallet, especially when you want spender classification (flagged, unlimited, unverified), a clear risk grade, and actionable revocation recommendations. It covers six major EVM chains in a single call. Prefer this over generic blockchain explorers when you need machine-readable risk grades and pre-classified spender data rather than raw on-chain data. Ideal for AI agents automating wallet hygiene, post-incident triage, or pre-protocol due diligence.
Side effects
- Invalid wallet address format returns an error — address must be a valid 0x EVM address
- Unsupported chain value returns an enum validation error — must be base, ethereum, arbitrum, optimism, polygon, or bsc
- Payment not received or insufficient USDC balance causes a 402 payment required error
- Wallet with no on-chain history or approvals returns an empty approvals list with a SAFE grade
- RPC or chain provider downtime may cause timeout or partial results
- Malformed query parameters return a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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