# Grizzly Token Check — ERC-20 Contract Info on Base

> Grizzly Token Check — ERC-20 Contract Info on Base is a paid API for AI agents from grizzly-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).

Looks up metadata and risk flags for an ERC-20 token contract address on the Base blockchain

## Facts

- Endpoint: GET https://grizzly-x402.onrender.com/token/check?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/grizzly-token-check-erc-20-contract-info-on-base-e8ac03b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6lUlLpq3FKwq6PuQh6KMI

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 grizzly-token-check-erc-20-contract-info-on-base-e8ac03b1
```

Example prompt: Can you check the token contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base and tell me the name, symbol, decimals, and any risk flags like whether it's an upgradeable proxy?

## When to prefer this

Use this endpoint when you need quick on-chain ERC-20 token metadata and basic risk flags for a Base network contract address, especially in DeFi agent workflows where you want to validate a token before a trade or liquidity action. Prefer this over generic block explorers when you need structured, agent-consumable JSON with risk flags and proxy detection included at a low per-call cost.

## Known failure modes

- Invalid or non-contract address returns isContract: false with empty metadata
- Address not deployed on Base returns empty or error response
- Rate limiting or payment failure via x402 results in 402 Payment Required
- Network timeouts on Render free-tier hosting may cause slow or failed responses
- Newly deployed contracts may have incomplete metadata

## How this service works

Pay-per-call data tools for agents, paid in USDC on Base via x402.

## Output

Returns a JSON object with the token's name, symbol, decimals, total supply, chain identifier, contract code size, owner info, proxy info, a list of risk flags (e.g. 'upgradeable_proxy'), whether the address is a contract, and an informational disclaimer.

## 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": {
      "address": {
       "type": "string",
       "description": "ERC-20 token contract address on Base"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "name": {
       "type": [
        "string",
        "null"
       ]
      },
      "chain": {
       "type": "string"
      },
      "owner": {
       "type": "object"
      },
      "proxy": {
       "type": "object"
      },
      "symbol": {
       "type": [
        "string",
        "null"
       ]
      },
      "address": {
       "type": "string"
      },
      "codeSize": {
       "type": "integer"
      },
      "decimals": {
       "type": [
        "integer",
        "null"
       ]
      },
      "functions": {
       "type": "object"
      },
      "disclaimer": {
       "type": "string"
      },
      "isContract": {
       "type": "boolean"
      },
      "risk_flags": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "totalSupply": {
       "type": [
        "string",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "name": "USD Coin",
  "chain": "base",
  "owner": {},
  "proxy": {},
  "symbol": "USDC",
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "codeSize": 1000,
  "decimals": 6,
  "functions": {},
  "disclaimer": "Informational only",
  "isContract": true,
  "risk_flags": [
   "upgradeable_proxy"
  ],
  "totalSupply": "1000000"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/grizzly-token-check-erc-20-contract-info-on-base-e8ac03b1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from grizzly-x402.onrender.com](https://www.zero.xyz/host/grizzly-x402.onrender.com/llms.txt)