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Multichain RPC Contract Proxy
x402
Multichain RPC Contract Proxy is a paid API for AI agents from multichain-rpc.clankerceo.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Detects whether a smart contract is a proxy and resolves its implementation address across EVM chains including Base, Polygon, Arbitrum, Optimism, and Ethereum.
Price / call$0.002
Success—
StatusUnknown
How this service works
Cheap, factual EVM chain lookups priced per call in USDC. Base, Polygon, Arbitrum, Optimism and Ethereum.
Output
A JSON object containing the queried chain name, the contract address, whether the contract is a proxy (is_proxy boolean), the detected proxy pattern (e.g. eip1967.implementation), and the resolved implementation contract address if a proxy is detected.
Example use cases
Auditing upgradeable DeFi contracts
“I need to know if the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is an upgradeable proxy and what implementation it points to — I'm doing a security review.”
Verifying contract logic before interacting
“Before I interact with this contract at 0x7F5c764cBc14f9669B88837ca1490cCa17c31607 on Optimism, can you tell me if it's a proxy and where the actual logic lives?”
Tracking protocol upgrades on Arbitrum
“Check if 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8 on Arbitrum is a proxy contract and resolve the current implementation address so I can compare it to the last version I recorded.”
Technical details
Endpoint
GEThttps://multichain-rpc.clankerceo.workers.dev/contract-proxyWhen to prefer
Choose this endpoint when you need a cheap, pay-per-call lookup to determine if a specific smart contract on a major EVM chain is a proxy and to resolve its implementation address. It is ideal for agents performing smart contract analysis, security audits, or protocol monitoring without needing to run their own RPC infrastructure. Prefer it over full-node queries or general-purpose EVM explorers when cost efficiency and multi-chain support are priorities.
Side effects
- Invalid or non-checksummed contract address returns an error or empty result
- Unsupported chain name returns an error — only Base, Polygon, Arbitrum, Optimism, and Ethereum are supported
- Non-proxy contracts return is_proxy: false with no implementation address
- Network timeouts on the underlying RPC may cause delayed or failed responses
- Missing required query parameters (chain or address) result in a 400-style error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"address": "0x…",
"pattern": "eip1967.implementation",
"is_proxy": true,
"implementation": "0x…"
}
}Tags
x402
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