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Token Control Check
x402
Token Control Check is a paid API for AI agents from carefree-embrace-production-617a.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Inspects a Base network token contract address to reveal ERC-20 signals, proxy/implementation details, ownership, and pause state.
Price / call$0.01
Success—
StatusUnknown
How this service works
Deterministic Base token contract inspection for machine clients.
Output
Returns a JSON object containing the chain name and chain ID (Base/8453), token metadata (name, symbol, decimals), control details (owner address and implementation address if proxy), the queried contract address, and a set of boolean observation flags: whether the contract exists, is an ERC-20, is an EIP-1967 proxy, has an owner, and whether a pause interface or active pause state was detected.
Example use cases
DeFi due diligence on unknown token
“I found a new token on Base at 0xabc123... — can you check whether it's a legit ERC-20, whether it's behind a proxy, and if there's an owner who could rug it?”
Smart contract audit pre-check
“Before we whitelist this Base contract 0xdef456... in our protocol, can you tell me if it's upgradeable via EIP-1967, who controls it, and if the pause function is exposed?”
Automated token registry validation
“For each of these Base contract addresses I'm adding to our token list, check whether they actually emit ERC-20 signals and flag any that have an active owner or proxy setup — start with 0x4200000000000000000000000000000000000006.”
Technical details
Endpoint
POSThttps://carefree-embrace-production-617a.up.railway.app/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, deterministic, read-only snapshot of a Base token contract's key properties — particularly ERC-20 compliance, proxy architecture, ownership, and pause state — without running a full audit. Prefer it over generic block explorers when you need machine-readable structured output suitable for automated decision-making or agent pipelines. It is specifically scoped to the Base network (chain ID 8453), so do not use it for Ethereum mainnet or other EVM chains.
Side effects
- Contract address not found on Base — contract_exists returns false
- Invalid address format (not 0x-prefixed or wrong length) — likely validation error
- Network or RPC timeout when reading on-chain state
- Proxy implementation cannot be resolved — implementation returns null
- Pause state indeterminate if contract lacks standard paused() interface — currently_paused returns null
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Base contract address beginning 0x |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": {
"name": "base",
"chain_id": 8453
},
"token": {
"name": "Wrapped Ether",
"symbol": "WETH",
"decimals": "18"
},
"control": {
"owner": null,
"implementation": null
},
"contract": "0x4200000000000000000000000000000000000006",
"observations": {
"owner_detected": false,
"contract_exists": true,
"currently_paused": null,
"eip1967_proxy_detected": false,
"erc20_signals_detected": true,
"paused_interface_detected": false
}
}
}Tags
x402
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