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Base EIP-1967 Proxy Resolver
x402
Base EIP-1967 Proxy Resolver is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-23).
Resolves EIP-1967 proxy metadata (implementation, admin, beacon addresses and is_proxy flag) for any contract on Base mainnet
Price / call$0.002
Success—
StatusUnknown
How this service works
EIP-1967 proxy resolver for a Base contract: implementation, admin, beacon addresses + is_proxy. Use when an agent must know what code actually runs behind a proxy before trusting or calling it.
Output
A JSON object containing the queried contract address, a boolean is_proxy flag, and nullable implementation, admin, and beacon addresses, plus the chain identifier ('base'). If the contract is not a proxy, implementation/admin/beacon will be null and is_proxy will be false.
Example use cases
Verify DeFi protocol contract before trading
“I'm about to call a lending protocol on Base at 0x3d9819210A31b4961b30EF54bE2aeD79B9c9Cd3b — is it a proxy and what's the real implementation contract behind it?”
Detect upgradeability risk in a token contract
“Check if the ERC-20 at 0x4200000000000000000000000000000000000006 on Base is an upgradeable proxy — I need to know if there's an admin who can swap out the logic.”
Audit proxy chain before smart contract integration
“We're integrating with a Base contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 — resolve its EIP-1967 proxy slots so I can see the implementation, admin, and beacon addresses before we go live.”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/proxy-info?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs to introspect a specific Base contract's proxy architecture before trusting or calling it — especially in DeFi security checks, pre-trade validation, or contract auditing workflows. It is purpose-built for EIP-1967 proxy resolution on Base, making it more precise than general contract ABI tools or block explorers. Prefer it over the sibling honeypot-detector endpoint when you specifically need raw proxy slot data (implementation/admin/beacon) rather than a security verdict.
Side effects
- Invalid or missing address parameter returns an error or unexpected result
- Non-Base chain addresses will not return valid proxy data (endpoint is Base-specific)
- Contract address that doesn't exist on Base may return is_proxy: false with all nulls
- Malformed 0x address (wrong length, non-hex) may cause a parsing error
- Network timeout or Cloudflare Worker outage returns a 5xx error
- Payment failure via x402 protocol returns 402 with payment requirements
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"admin": null,
"chain": "base",
"beacon": null,
"address": "0x4200000000000000000000000000000000000006",
"is_proxy": false,
"implementation": null
}
}Tags
x402
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