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Multichain RPC Proxy Implementation Lookup
x402
Multichain RPC Proxy Implementation Lookup 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 on EVM chains is a proxy and resolves the underlying implementation address using EIP-1967 and similar patterns.
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 queried 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 was detected.
Example use cases
Auditing an upgradeable DeFi protocol
“Check if the contract 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 on Ethereum is a proxy contract and tell me what implementation address it points to.”
Verifying token contract on Base
“I need to know if the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base is a proxy — can you look up whether it uses EIP-1967 and resolve the actual logic contract?”
Cross-chain proxy resolution for security review
“For both the Polygon and Arbitrum deployments of contract 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174, check if they're proxy contracts and return the underlying implementation addresses.”
Technical details
Endpoint
GEThttps://multichain-rpc.clankerceo.workers.dev/proxy-implementationWhen to prefer
Choose this endpoint when you need to determine if a smart contract is upgradeable and resolve its actual logic contract across Base, Polygon, Arbitrum, Optimism, or Ethereum. It is purpose-built for proxy detection using recognized patterns like EIP-1967 and is priced per-call at $0.002 USDC, making it cost-effective for spot lookups. Prefer it over general-purpose RPC calls when you want a structured, pre-parsed proxy resolution result rather than raw storage slot reads.
Side effects
- Invalid or unrecognized chain name returns an error — use supported values: base, polygon, arbitrum, optimism, ethereum
- Malformed or checksumless contract address returns a parsing error
- Contract is not a proxy — returns is_proxy: false with no implementation address
- RPC node unavailable for the target chain — may return a 5xx or timeout
- Non-existent contract address (no bytecode) may return is_proxy: false or an error
- Payment failure via x402 protocol blocks the request with a 402 response
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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