# Saylor Innovations EVM Contract Storage Slot Reader

> Saylor Innovations EVM Contract Storage Slot Reader is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Reads a single 32-byte storage slot from a smart contract on any of 16 supported EVM chains, returning the value as hex, unsigned integer, and address form.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/chain/storage?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-evm-contract-storage-slot-reader-08cd7e94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l0xKDuDXPD_POvORKW6FV

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 saylor-innovations-evm-contract-storage-slot-reader-08cd7e94
```

Example prompt: What address is stored in the EIP-1967 implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc) of the contract 0x1234567890abcdef1234567890abcdef12345678 on Ethereum?

## When to prefer this

Choose this endpoint when you need to read a specific, known storage slot from a smart contract on one of 16 supported EVM chains — especially for proxy pattern inspection (EIP-1967, EIP-897), verifying delegated addresses, or inspecting raw contract state without deploying or running a full node. It is ideal for agents auditing contract upgradability, detecting proxy implementations, or verifying on-chain configuration values across Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche, Gnosis, Linea, Scroll, Mantle, Blast, Sonic, Celo, Berachain, and Unichain.

## Known failure modes

- Invalid or unsupported chain name/ID returns an error
- Malformed contract address (non-checksummed or wrong length) may cause a rejection
- Invalid slot format (neither decimal integer nor valid 0x hex) causes a parse error
- Contract does not exist on specified chain — slot will typically return zero value with is_zero=true
- Network or RPC timeout on the target chain returns a server error
- Payment not included or insufficient — returns HTTP 402

## How this service works

Read one 32-byte contract storage slot on 16 EVM chains, returned as hex, integer and address form, for example proxy implementation slots.

## Output

A JSON object containing the chain name, EIP-155 chain ID, contract address queried, normalized slot in hex, the 32-byte raw value as hex, the value as an unsigned integer string, the low 20 bytes decoded as an Ethereum address (or null if not address-like), a boolean is_zero indicating whether the slot is empty, and a source field identifying where the data was read from.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "address",
      "slot"
     ],
     "properties": {
      "slot": {
       "type": "string",
       "description": "storage slot as a decimal integer or 0x hex (for example 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc, the EIP-1967 implementation slot)"
      },
      "chain": {
       "type": "string",
       "description": "chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id"
      },
      "address": {
       "type": "string",
       "description": "the contract address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "chain",
      "chain_id",
      "address",
      "slot",
      "value_hex",
      "value_uint",
      "is_zero",
      "source"
     ],
     "properties": {
      "slot": {
       "type": "string",
       "description": "the storage slot, normalized to hex"
      },
      "chain": {
       "type": "string",
       "description": "the chain name that was queried"
      },
      "source": {
       "type": "string",
       "description": "where the data was read from"
      },
      "address": {
       "type": "string",
       "description": "the contract that was read"
      },
      "is_zero": {
       "type": "boolean",
       "description": "true when the slot is empty"
      },
      "chain_id": {
       "type": "number",
       "description": "EIP-155 chain id of that network"
      },
      "value_hex": {
       "type": "string",
       "description": "the raw 32-byte value"
      },
      "as_address": {
       "type": [
        "string",
        "null"
       ],
       "description": "the low 20 bytes as an address when the value looks like one, else null"
      },
      "value_uint": {
       "type": "string",
       "descripti
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-evm-contract-storage-slot-reader-08cd7e94/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)