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Biosfera Storage Slot Reader
x402
Biosfera Storage Slot Reader is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.001/call, status down (last checked 2026-10-02).
Returns the raw 32-byte value stored at a specific storage slot of a smart contract on Base, Ethereum, Arbitrum, Optimism, or Polygon using eth_getStorageAt
Price / call$0.001
Success—
StatusDown
How this service works
Use when you need the raw 32-byte value of a storage slot of a contract on Base, Ethereum, Arbitrum, Optimism or Polygon via eth_getStorageAt, for example to inspect proxies, owners or packed state.
Output
Returns the raw 32-byte hexadecimal value stored at the specified storage slot of the given contract on the requested chain, as returned by eth_getStorageAt. Useful for reading proxy pointers, owner addresses, packed bitfields, and any other low-level on-chain state.
Example use cases
Inspect proxy implementation address
“Can you read storage slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc of the contract at 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48 on Ethereum? I want to find out which implementation contract this proxy is pointing to.”
Check contract owner slot on Base
“Read storage slot 0 of the contract 0x2ae3f1ec7f1f5012cfc6d1b42bf2979f2b7c5f2e on Base — I need to see who is stored as the owner in the first storage slot.”
Debug packed state variables on Arbitrum
“Fetch the raw value at storage slot 5 of contract 0xfd086bc7cd5c481dcc9c85ebe478a1c0b69fcbb9 on Arbitrum so I can inspect the packed state variables stored there.”
Technical details
Endpoint
GEThttps://biosfera.46-62-215-147.sslip.io/o/storage-slot?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need low-level, raw storage access to an EVM smart contract — especially for inspecting proxy patterns (EIP-1967, EIP-1822), reading packed state variables, or verifying ownership slots directly without relying on ABI-decoded contract calls. Prefer this over higher-level token or balance endpoints when you need arbitrary slot data not exposed by standard ERC interfaces. Covers Base, Ethereum, Arbitrum, Optimism, and Polygon.
Side effects
- Invalid contract address format (not a 40-hex-char 0x address) returns a validation error
- Invalid slot format (not a valid hex or decimal number) returns a validation error
- Unsupported chain name returns an enum validation error
- Contract address that does not exist on the chain returns 0x0000...0000 (empty slot, not an error)
- Network RPC timeout or unavailability returns a service error
- Payment not provided or insufficient returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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