# EVM Raw Storage Slot Reader

> EVM Raw Storage Slot Reader is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Reads a single raw storage slot from any smart contract on one of ten supported EVM chains

## Facts

- Endpoint: POST https://twin.unykorn.org/evm-storage?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-raw-storage-slot-reader-82a1290b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5QKhtJjmbFlKPJp4PsAiS

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 evm-raw-storage-slot-reader-82a1290b -d '<json body>'
```

Example prompt: What's the raw value stored at storage slot 0x0 of the contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum mainnet?

## When to prefer this

Use this endpoint when you need to read a specific raw storage slot from a smart contract without having the ABI, or when you want to bypass ABI decoding and inspect storage directly. Ideal for debugging proxy contracts (EIP-1967), auditing storage layouts, or checking any storage variable by its computed slot index across ten major EVM chains in a single pay-per-call model.

## Known failure modes

- Invalid contract address format (must be 0x followed by 40 hex chars)
- Invalid slot format (must be valid hex string)
- Unsupported chain name (only ten chains supported)
- Contract does not exist at the given address on the specified chain
- Payment failure or insufficient x402 balance
- Node RPC timeout or unavailability for the requested chain
- Block identifier not found or not yet finalized

## How this service works

Read one raw storage slot from any contract — Genesis402 / UnyKorn Operator Network

## Output

Returns a JSON object with ok status, the raw bytes32 value stored at the requested slot, a payment receipt including tx_hash, amount paid in USD, and a receipt_id, plus the timestamp of the response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "slot": {
     "type": "string",
     "pattern": "^0x[0-9a-fA-F]*$"
    },
    "block": {
     "type": "string"
    },
    "chain": {
     "enum": [
      "ethereum",
      "base",
      "polygon",
      "arbitrum",
      "optimism",
      "bsc",
      "avalanche",
      "gnosis",
      "linea",
      "scroll"
     ],
     "type": "string"
    },
    "address": {
     "type": "string",
     "pattern": "^0x[0-9a-fA-F]{40}$"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "evm-storage",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.25,
   "receipt_id": "g402-<16hex>"
  },
  "generated_at": "<iso8601>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-raw-storage-slot-reader-82a1290b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)