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Token Contract Inspector (Base/Ethereum/Optimism/Arbitrum/Polygon)
x402
Token Contract Inspector (Base/Ethereum/Optimism/Arbitrum/Polygon) is a paid API for AI agents from agents.crowdspark.me, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Inspects a token contract address on Base, Ethereum, Optimism, Arbitrum, or Polygon to detect contract type (ERC20/ERC721/ERC1155), name, symbol, decimals, total supply, owner, and upgradeable-proxy details.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call utilities for AI agents over x402, USDC on Base.
Output
Returns a JSON object with: token name, symbol, decimals, total supply (raw and formatted), token standard (ERC20/ERC721/ERC1155), whether the address is a contract, contract owner address, chain and chain_id, and a proxy object indicating whether it's an upgradeable proxy (with type such as EIP-1967, beacon, EIP-1167 clone, or legacy zeppelinos), plus implementation and admin addresses if applicable.
Example use cases
Pre-swap token safety check
“I'm about to swap into 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum — can you verify it's a legitimate ERC20, tell me its name and symbol, total supply, and whether it's a proxy contract before I proceed?”
NFT contract type detection
“Can you check the contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum and tell me if it's an ERC721 or ERC1155, who owns it, and if it has any upgradeable proxy setup?”
DeFi listing due diligence
“We're about to list 0x4200000000000000000000000000000000000042 on Optimism in our app — can you pull its token metadata, confirm its standard, decimals, and check if it's behind an upgradeable proxy so we know the risk?”
Technical details
Endpoint
GEThttps://agents.crowdspark.me/v1/chain/token?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need on-chain ground-truth metadata about a token contract — especially before executing swaps, payments, or listings — and need to know the token standard, proxy upgrade risk, owner, supply, and decimals in a single call. Prefer this over generic block explorers when you need structured, machine-readable output directly consumable by an agent, and when operating across Base, Ethereum, Optimism, Arbitrum, or Polygon.
Side effects
- Address is not a contract (EOA) — is_contract returns false
- Unsupported chain specified — returns error or defaults to base
- Invalid or malformed address (not 0x... format) — returns validation error
- RPC timeout or public node unavailability — may return upstream network error
- Contract exists but implements no recognized standard — standard field may be null or undetected
- Rate limit exceeded without payment — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "USD Coin",
"chain": "base",
"owner": "0x3ABd6f64A422225E61E435baE41db12096106df7",
"proxy": {
"type": "zeppelinos (legacy unstructured storage)",
"admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
"is_proxy": true,
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"symbol": "USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"chain_id": 8453,
"decimals": 6,
"standard": "ERC20",
"is_contract": true,
"total_supply": "4299464528.64453"
}
}Tags
x402
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