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Base Storage Slot Reader
x402
Base Storage Slot Reader is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Reads a raw 32-byte storage slot value from any contract on Base mainnet via eth_getStorageAt, returning the value as hex and unsigned integer.
Price / call$0.005
Success—
StatusUnknown
How this service works
Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.
Output
Returns the 32-byte storage slot value as a zero-padded hex string and its equivalent unsigned integer representation. If the slot has never been written to, it returns a zero value (0x0000...0000 / 0).
Example use cases
Proxy implementation address lookup
“Can you read storage slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc of the contract at 0x4200000000000000000000000000000000000010 on Base? I need to find the implementation address stored there.”
DeFi contract state inspection
“I want to check the raw storage value at slot 1 for the Compound contract at 0xb125E6687d4313864e53df431d5425969c15Eb2 on Base — give me both the hex and the uint256 value.”
Detecting uninitialized storage slots
“Is slot 5 of the contract at 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 on Base set to anything, or is it zero/uninitialized?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/storage?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need raw EVM storage inspection on Base mainnet — particularly useful for reading proxy implementation slots, inspecting packed storage variables, or auditing contract state that isn't exposed via a public getter. Prefer this over contract introspection endpoints when you know the exact storage layout and need the raw bytes rather than ABI-decoded values.
Side effects
- Invalid contract address format returns an error
- Slot index out of valid range may return zero rather than an error
- Non-contract (EOA) address returns zero for all slots
- Network congestion may cause slow or failed RPC responses
- Missing required parameters (address or slot) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slot | — | |
| address | string |
Tags
x402
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