# Crypto Token Inspector – ERC20 Risk & Metadata (x402)

> Crypto Token Inspector – ERC20 Risk & Metadata (x402) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns detailed ERC20 token metadata, proxy structure, risk flags, ownership, and balances for a given contract address on Base or Ethereum mainnet, paid per-call via x402 USDC microtransaction.

## Facts

- Endpoint: GET https://kr-x402-mvp.kgy5612.workers.dev/v1/token?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-token-inspector-erc20-risk-metadata-x402-386a5a00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uSk8be-0TXGdyjF4cHzqa

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 crypto-token-inspector-erc20-risk-metadata-x402-386a5a00
```

Example prompt: Can you inspect the token contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base and tell me if it's upgradeable, who owns it, and what the risk flags are?

## When to prefer this

Choose this endpoint when an AI agent needs structured, machine-readable ERC20 contract metadata and security risk signals for a specific token address before executing a trade, approving a contract interaction, or assessing DeFi protocol risk — especially when no API key management is desired and pay-per-call micropayment via x402/USDC is acceptable. Prefer over generic block explorers when you need parsed proxy structure, risk flags, and interface detection in a single call rather than raw ABI data.

## Known failure modes

- Invalid or non-checksummed address format returns a 400 validation error
- Address is an EOA (not a contract) — is_contract will be false and most fields will be null
- Unsupported chain value returns enum validation error
- Contract exists but is not an ERC20 — kind field may differ and token fields may be absent
- x402 payment failure if agent wallet has insufficient USDC on Base
- Network timeout or RPC error on Base/Ethereum — upstream node unavailable
- Address is a proxy but implementation cannot be resolved — proxy fields partially null

## 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

A JSON object containing: token kind (ERC20), name, symbol, decimals, total supply, chain ID, proxy type and admin/implementation addresses, risk flags array (e.g. 'upgradeable_proxy', 'has_owner', 'admin_can_change_logic'), owner address, owner_renounced boolean, native balance, code size in bytes, supported interfaces (ERC165/721/1155), a 'safe' assessment field, a checked_at timestamp, and suggested next-call paths for deeper analysis (e.g. token-risk, allowance endpoints).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "enum": [
        "base",
        "eth"
       ],
       "type": "string",
       "description": "base (default) or eth mainnet"
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "examples": [
        "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
       ],
       "description": "Address to inspect"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "kind": "ERC20",
  "next": [
   "/crypto/token-risk?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "/crypto/allowance?owner=&spender="
  ],
  "safe": null,
  "chain": "base",
  "flags": [
   "upgradeable_proxy",
   "has_owner",
   "admin_can_change_logic"
  ],
  "owner": "0x...",
  "proxy": {
   "type": "ZEPPELINOS_LEGACY",
   "admin": "0x4fc7850364958d97b4d3f5a08f79db2493f8ca44",
   "beacon": null,
   "is_proxy": true,
   "implementation": "0x2ce6311ddae708829bc0784c967b7d77d19fd779"
  },
  "token": {
   "name": "USD Coin",
   "symbol": "USDC",
   "decimals": 6,
   "total_supply": 4100000000
  },
  "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "summary": "ERC20 USDC behind ZEPPELINOS_LEGACY proxy, has owner",
  "chain_id": 8453,
  "checked_at": "2026-10-30T03:40:00Z",
  "interfaces": {
   "erc165": false,
   "erc721": false,
   "erc1155": false
  },
  "is_contract": true,
  "native_balance": 0,
  "code_size_bytes": 1852,
  "owner_renounced": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-token-inspector-erc20-risk-metadata-x402-386a5a00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kr-x402-mvp.kgy5612.workers.dev](https://www.zero.xyz/host/kr-x402-mvp.kgy5612.workers.dev/llms.txt)