# Tanod chainpeek - Contract Storage Slot Reader

> Tanod chainpeek - Contract Storage Slot Reader is a paid API for AI agents from tanod.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Reads the raw value stored at a specific storage slot of a smart contract on Ethereum or Base, at a given block height.

## Facts

- Endpoint: POST https://tanod.dev/v1/chain/storage?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tanod-chainpeek-contract-storage-slot-reader-ddfeadbc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O_IEr6IQlxnooB8_m80YM

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 tanod-chainpeek-contract-storage-slot-reader-ddfeadbc -d '<json body>'
```

Example prompt: What value is stored at storage slot 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3 of the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base at the latest block?

## When to prefer this

Choose this endpoint when you need raw EVM storage slot data from Ethereum or Base without requiring a full node or web3 library setup. It is ideal for AI agents inspecting smart contract internals, verifying proxy implementation pointers, auditing historical contract state at a specific block, or decoding on-chain ownership and configuration values. It handles both hex and decimal slot notation and returns both hex and decoded forms (uint256, address) in one call. Prefer it over general blockchain explorers when you need programmatic, structured output suitable for agent reasoning.

## Known failure modes

- Invalid contract address format returns a 400 or validation error
- Invalid storage slot format (not hex or decimal) returns a schema validation error
- Unsupported chain (not ethereum or base) returns an enum validation error
- Contract does not exist at the given address — returns a zero value (indistinguishable from an empty slot)
- Block number out of range or not yet finalized returns an error
- Network or RPC node issues may cause transient 5xx errors
- Malformed block parameter returns validation error

## How this service works

One MCP server and HTTP API with 193 pay-per-call tools for AI agents (security checks, chain data, finance, aviation, documents), plus free uptime and MikroTik monitoring and 130+ free browser tools. No signup; free daily tier. Operated by an AI.

## Output

Returns a JSON object containing the raw 32-byte hex value at the requested storage slot, its decimal representation as a uint256, an address-formatted interpretation if applicable, a boolean indicating whether the value is zero, plus echoed inputs (slot, block, chain, address).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "slot": {
   "type": "string",
   "pattern": "^(0x[0-9a-fA-F]{1,64}|0|[1-9][0-9]{0,76})$",
   "description": "Storage slot: 0x-hex up to 32 bytes, or a decimal number (0 is the first slot)."
  },
  "block": {
   "anyOf": [
    {
     "type": "string",
     "pattern": "^(latest|pending|finalized|[0-9]{1,13})$"
    },
    {
     "type": "integer"
    },
    {
     "type": "null"
    }
   ],
   "default": null,
   "description": "latest (default), pending, finalized or a block number."
  },
  "chain": {
   "enum": [
    "ethereum",
    "base",
    "robinhood"
   ],
   "type": "string",
   "description": "ethereum, base or robinhood (Robinhood Chain, chain id 4663)."
  },
  "address": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$",
   "description": "Contract address."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
  "block": "latest",
  "chain": "base",
  "value": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779",
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "as_uint": "256329043973081575610686690754155656197982639993",
  "is_zero": false,
  "as_address": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
 }
}
```

## More

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