# Ethereum Contract Storage Slot Reader

> Ethereum Contract Storage Slot Reader is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-03).

Reads the value stored at storage slot 0 of a given Ethereum smart contract address from on-chain data

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/ethereum/storage/:address/0?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ethereum-contract-storage-slot-reader-d3e75e2c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XeK5vVhFXWccVN6isRUgs

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ethereum-contract-storage-slot-reader-d3e75e2c
```

Example prompt: Can you look up what value is stored at storage slot 0 of the Ethereum contract at address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48?

## When to prefer this

Choose this endpoint when you need to directly inspect raw on-chain EVM storage state for a specific Ethereum contract without using a full node RPC setup. It is ideal for quickly auditing storage slot 0 (often the owner, implementation pointer, or primary state variable) of any deployed Ethereum contract. Prefer this over general blockchain explorers when you need a programmatic, agent-callable lookup that returns machine-readable storage data for downstream processing.

## Known failure modes

- Invalid Ethereum address format returns an error
- Address is an EOA (externally owned account) with no contract code — slot returns 0x00
- Network connectivity issues or node unavailability may cause timeouts
- Incorrect address checksum may result in rejection or unexpected results
- The slot value may be 0x0000...0000 if nothing has been written to slot 0 yet

## How this service works

Contract Storage Slot (ethereum). Ethereum contract storage slot read: raw 32-byte value plus uint and address decodings.

## Output

Returns the raw 32-byte value stored at storage slot 0 of the specified Ethereum contract address, pulled directly from on-chain EVM state. This can represent an integer, an address, a boolean flag, a packed value, or a pointer depending on how the contract lays out its storage.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ethereum-contract-storage-slot-reader-d3e75e2c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)