# DeFi Token Approval Security Checker

> DeFi Token Approval Security Checker is a paid API for AI agents from defi.hugen.tokyo, paid per call via x402, $0.010000/call, status unknown (last checked 2026-09-13).

Analyzes token approvals for a wallet address to detect unlimited allowances, suspicious spender contracts, and high-risk approval targets

## Facts

- Endpoint: GET https://defi.hugen.tokyo/defi/approval
- Price: $0.010000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/defi-hugen-tokyo-ef239963
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dSXRC7rDYoy2icX_KNN1D

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability defi-hugen-tokyo-ef239963
```

Example prompt: Scan my Ethereum wallet 0xAbC...123 for risky token approvals — I want to know if any contracts have unlimited allowances or look like suspicious spender addresses that could drain my funds.

## When to prefer this

Use this endpoint when an AI agent needs to audit a specific wallet's token approval risk exposure — particularly before executing DeFi transactions, after interacting with a new protocol, or as part of a routine wallet security check. Prefer over generic blockchain explorers when you need structured, security-focused analysis of allowances rather than raw transaction data.

## Known failure modes

- Invalid or malformed wallet address returns a 400 error
- Unsupported blockchain network returns an unsupported chain error
- No approvals found for the address returns an empty result set
- Payment not received or insufficient USDC results in 402 Payment Required
- Rate limiting or timeout on heavily queried addresses may return 429 or 503

## How this service works

Check token approval security risks — detect unlimited allowances, suspicious spender contracts, and high-risk approval targets. Essential for wallet hygiene. No API keys needed. Accepts USDC payments on Base and Solana

## Output

Returns a list of token approvals associated with the queried wallet, flagging unlimited allowances, suspicious or unverified spender contracts, and high-risk approval targets, along with risk scores and recommended revocations for wallet hygiene.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "required": [
    "method"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/defi-hugen-tokyo-ef239963/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi.hugen.tokyo](https://www.zero.xyz/host/defi.hugen.tokyo/llms.txt)