# Base EIP-1967 Proxy Resolver

> 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

## Facts

- Endpoint: GET https://x402-data-api.sigrunner.workers.dev/chain/proxy-info?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-eip-1967-proxy-resolver-4ba6dfe2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ued6LK8Dne-soKt9tblAm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability base-eip-1967-proxy-resolver-4ba6dfe2
```

Example prompt: Before I interact with the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, check if it's an EIP-1967 proxy and tell me the actual implementation address running behind it.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "address": {
       "type": "string",
       "description": "0x-prefixed contract address on Base"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "address",
      "is_proxy",
      "implementation",
      "admin",
      "beacon",
      "chain"
     ],
     "properties": {
      "admin": {
       "type": "null"
      },
      "chain": {
       "type": "string"
      },
      "beacon": {
       "type": "null"
      },
      "address": {
       "type": "string"
      },
      "is_proxy": {
       "type": "boolean"
      },
      "implementation": {
       "type": "null"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "admin": null,
  "chain": "base",
  "beacon": null,
  "address": "0x4200000000000000000000000000000000000006",
  "is_proxy": false,
  "implementation": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-eip-1967-proxy-resolver-4ba6dfe2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-data-api.sigrunner.workers.dev](https://www.zero.xyz/host/x402-data-api.sigrunner.workers.dev/llms.txt)