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Base Proxy Detection (agentshelf.syntexa.ch)
x402
Base Proxy Detection (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-18).
Detects whether a Base mainnet address is an upgradeable proxy and returns its implementation, admin, and proxy kind (EIP-1967, UUPS, Transparent, or legacy OpenZeppelin).
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs whether a Base address is an upgradeable proxy, plus implementation and admin. Detects EIP-1967, UUPS, Transparent, and legacy OpenZeppelin slots, including USDC. Read-only. No spend. Send JSON {"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}. Exact $0.004 USDC on Base. Try unpaid POST /v1/sandbox/base-proxy first.
Output
Returns a JSON object indicating whether the address is an upgradeable proxy (true/false), the detected proxy kind (e.g. EIP-1967, UUPS, Transparent, legacy OpenZeppelin, or null), the implementation contract address, the admin address, and the beacon address where applicable. For EOAs or non-proxy contracts, upgradeable_proxy is false and other fields are null.
Example use cases
Verify USDC proxy implementation on Base
“Is the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) an upgradeable proxy? If so, tell me what proxy standard it uses and what the current implementation address is.”
Audit DeFi protocol upgrade risk
“I'm reviewing a DeFi protocol — can you check if 0x4200000000000000000000000000000000000006 on Base is a proxy contract, and if so, who is the admin and what's the implementation behind it?”
Smart contract security due diligence
“Before I interact with this Base contract at 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA, can you tell me if it's upgradeable, what proxy pattern it uses, and who controls the admin key?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/base-proxy?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to determine proxy status and implementation details for a contract specifically on Base mainnet, and need support for legacy OpenZeppelin slots (including USDC-style proxies) in addition to modern EIP-1967, UUPS, and Transparent patterns. Prefer this over generic Ethereum proxy checkers when Base mainnet is the target chain.
Side effects
- Invalid or malformed address returns a validation error
- Non-existent or EOA address returns upgradeable_proxy: false with null fields
- RPC connectivity issues with Base mainnet may cause timeouts
- Exotic or custom proxy patterns not matching known slots may not be detected
- Payment not included or insufficient USDC causes 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Account on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Circle USDC, a legacy OpenZeppelin proxy). Returns implementation, admin, beacon, and proxy_kind. An EOA is upgradeable_proxy false. |
Tags
x402
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