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Proxy Implementation Slot Reader
x402
Proxy Implementation Slot Reader is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.0015/call, status unknown (last checked 2026-09-28).
Reads EIP-1967, ZeppelinOS, and EIP-1822 (UUPS) proxy implementation and admin storage slots on Base, Ethereum, Arbitrum, Optimism, or Polygon to identify upgrade patterns and implementation addresses.
Price / call$0.0015
Success—
StatusUnknown
How this service works
Use when you need to know if a contract on Base, Ethereum, Arbitrum, Optimism or Polygon is an upgradeable proxy: reads the EIP-1967, ZeppelinOS and EIP-1822 (UUPS) implementation and admin slots, names the standard, and tells whether the address has code.
Output
Returns the proxy standard name (e.g. EIP-1967, ZeppelinOS, UUPS), the implementation contract address stored in the relevant slot, the admin address if available, and a boolean indicating whether the address actually has deployed bytecode.
Example use cases
Audit upgradeable DeFi protocol contract
“I'm auditing a DeFi protocol and need to know if the contract at 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 on Ethereum is an upgradeable proxy — tell me the implementation address, the admin, and which proxy standard it uses.”
Verify Arbitrum bridge proxy pattern
“Check whether the contract 0x8315177aB297bA92A06054cE80a67Ed4DBd7ed3a on Arbitrum is a proxy contract and, if so, what's the underlying implementation address and standard being used?”
Monitor Base contract for proxy upgrades
“I want to know the current implementation address and proxy type for the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — is it upgradeable and what standard does it follow?”
Technical details
Endpoint
GEThttps://biosfera.46-62-215-147.sslip.io/o/proxy-implementation?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to inspect the proxy architecture of a specific smart contract across major EVM chains — particularly when auditing upgradeable contracts, tracing logic contract addresses, or determining whether a contract can be upgraded and by whom. It is preferable to manual RPC slot reads because it abstracts the raw storage slot decoding and proxy standard identification in a single call.
Side effects
- Address is not a proxy contract — slots return zero address or empty
- Invalid address format (must match 0x + 40 hex chars)
- Unsupported chain value returns validation error
- Network RPC timeout or chain temporarily unavailable
- Contract has code but uses a non-standard or unknown proxy pattern not covered by EIP-1967/ZeppelinOS/UUPS
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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