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Contract Storage Slot Reader
x402
Contract Storage Slot Reader is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Reads a raw EVM contract storage slot via eth_getStorageAt and returns the value decoded as hex, uint256, and address.
Price / call$0.002
Success—
StatusUnknown
How this service works
Read a raw storage slot of any contract (eth_getStorageAt), also decoded as uint and address. Use for proxy slots, packed variables and debugging.
Output
Returns the 32-byte raw hex value of the requested storage slot, along with two decoded interpretations: the value as a uint256 integer and as a checksummed Ethereum address (useful for proxy implementation or admin slots). Also echoes back the contract address, slot, chain, and block reference.
Example use cases
Inspect proxy implementation address
“Read the EIP-1967 implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076a3378d5f84ecf4e14d26db73) of the USDC proxy contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum and tell me what address it decodes to.”
Debug packed variable in DeFi contract
“Check what value is in storage slot 3 of the Aave lending pool at 0x7d2768dE32b0b80b7a3454c06BdAc94A69DDc7A9 on Ethereum at the latest block — give me the raw hex and the uint256.”
Verify contract state on Base
“Look up storage slot 0 of the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base and tell me what address and uint256 value it holds.”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/evm/storage?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to inspect low-level EVM storage of any contract — especially for reading proxy implementation slots (EIP-1967, EIP-1822), admin slots, or packed variables that aren't exposed via ABI. Prefer it over event logs or decoded ABI calls when you need raw on-chain state verification or debugging. Supports Ethereum, Base, Arbitrum, Optimism, and Polygon.
Side effects
- Invalid contract address format returns a 400 error
- Non-existent slot returns a zero value (not an error)
- Unsupported chain name returns a 400 or 422 error
- Invalid block number or tag returns an error
- Node RPC timeout causes a 503 or 504 response
- Payment not received results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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