# Arbitrum Storage Slot Read

> Arbitrum Storage Slot Read is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-24).

Reads a raw 32-byte storage slot from any contract on Arbitrum One using eth_getStorageAt, returning the value as hex, number, and optionally as an address.

## Facts

- Endpoint: GET https://agent-data-tools.revmesh2074.workers.dev/arb/storage?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Provider: agent-data-tools.revmesh2074.workers.dev
- Website: https://agent-data-tools.revmesh2074.workers.dev
- Canonical page: https://www.zero.xyz/c/agent-data-tools-revmesh2074-workers-dev-arbitrum-storage-slot-read-2cd04e0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pUWfR6eDZz_oAR0nzWxjG

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 agent-data-tools-revmesh2074-workers-dev-arbitrum-storage-slot-read-2cd04e0a
```

Example prompt: What's stored at slot 0 of the Arbitrum contract at 0x912CE59144191C1204E64559FE8253a0e49E6548 — show me the raw hex, the number value, and whether it looks like an address.

## When to prefer this

Use this endpoint when you need to inspect raw contract storage on Arbitrum One that is not exposed by any public getter function — such as proxy implementation pointers, owner variables stored directly in a slot, or mapping/struct entries accessed by a computed key. For proxy contracts specifically, the sibling arb_proxy endpoint is recommended. Prefer this over general Ethereum storage reads when the target contract is deployed on Arbitrum One.

## Known failure modes

- 400 Bad Request if the contract address is malformed or not a valid 0x address — not charged
- 400 Bad Request if the slot string is not a valid decimal index or 0x 32-byte hex key — not charged
- Empty or zero value returned if the slot has never been written (not an error)
- Possible RPC timeout or upstream Arbitrum node error for very recent blocks

## How this service works

Read one raw storage slot of a contract on Arbitrum One (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use arb_proxy. A malformed address or slot is rejected with 400, uncharged.

## Output

Returns an object containing: the resolved slot key, the current block number, the chain name and chain ID (Arbitrum One), the raw 32-byte hex value, its decimal representation as a string (asNumber), and its interpretation as an EVM address (asAddress) when the value fits one.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "slot": {
   "type": "string",
   "description": "Slot: a decimal index (0, 1, 2…) or a 0x 32-byte key"
  },
  "address": {
   "type": "string",
   "description": "0x contract address"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "slot": {
   "type": "string"
  },
  "block": {
   "type": "number"
  },
  "chain": {
   "type": "string"
  },
  "value": {
   "type": "string"
  },
  "address": {
   "type": "string"
  },
  "chainId": {
   "type": "number"
  },
  "asNumber": {
   "type": "string"
  },
  "asAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-data-tools-revmesh2074-workers-dev-arbitrum-storage-slot-read-2cd04e0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-data-tools.revmesh2074.workers.dev](https://www.zero.xyz/host/agent-data-tools.revmesh2074.workers.dev/llms.txt)