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Swift Bot Labs Toolbox – EVM Contract Inspector
x402
Swift Bot Labs Toolbox – EVM Contract Inspector is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Looks up on-chain metadata for an EVM smart contract address, including whether it is a proxy, its implementation address, and its bytecode size.
Price / call$0.005
Success—
StatusUnknown
How this service works
62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.
Output
A JSON object indicating whether the call succeeded, the tool name, and a result object containing the contract type (e.g. 'contract'), the chain name, proxy metadata (standard name and implementation address if applicable), the queried address, and the on-chain code size in bytes.
Example use cases
Proxy pattern detection for auditors
“I need to audit this contract — can you tell me if 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is a proxy contract and which proxy standard it uses?”
DeFi protocol research
“What's the actual logic contract behind the USDC contract on Base at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913? I want to know if it's upgradeable and what it points to.”
Smart contract size validation
“Check the contract at 0x4200000000000000000000000000000000000006 on Optimism — is it a real deployed contract and how large is its bytecode?”
Technical details
Endpoint
GEThttps://x402-toolbox.swiftbotlab.workers.dev/v1/evm/contract?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call lookup of EVM contract metadata — especially proxy detection and implementation resolution — without setting up an RPC node or API key. Ideal for agents doing one-off contract inspections across multiple chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche, Gnosis). Prefer alternatives if you need full ABI decoding, event logs, or historical state.
Side effects
- Address is an EOA (externally owned account) with no contract code — returns empty or non-contract result
- Invalid or unsupported chain identifier — request rejected
- Malformed Ethereum address — validation error
- Network timeout reaching the target chain RPC — transient failure
- Contract exists but proxy slot is non-standard or unreadable — proxy fields may be null
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "evm-contract",
"result": {
"type": "contract",
"chain": "base",
"proxy": {
"standard": "ZeppelinOS (legacy unstructured storage)",
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"codeSize": 1852
}
}
}Tags
x402
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