ToolVet
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Chain Storage

by Tanod chainpeek in Onchain & crypto

x402 APIPassing, checked 4 h ago

chainpeek (Tanod) contract storage slot read (eth_getStorageAt) on Ethereum, Base or Robinhood Chain. Use when an agent must read a raw storage slot of a contract, for example a proxy implementation slot.

POST https://tanod.dev/v1/chain/storage

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
326 ms typical, 748 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

POST https://tanod.dev/v1/chain/storage

Each call costs $0.001 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://tanod.dev/v1/chain/storage
content-type: application/json

{
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "chain": "base",
  "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesContract address.
blockstring or integer or nullNolatest (default), pending, finalized or a block number. Default: null.
chainstringYesethereum, base or robinhood (Robinhood Chain, chain id 4663). One of: ethereum, base, robinhood.
slotstringYesStorage slot: 0x-hex up to 32 bytes, or a decimal number (0 is the first slot).

Example response

The provider's example. We can't check it without paying.

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

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tanod.dev/v1/chain/storage' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","chain":"base","slot":"0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://tanod.dev/v1/chain/storage' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","chain":"base","slot":"0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftanod.dev%2Fv1%2Fchain%2Fstorage&method=POST
const res = await pay("https://tanod.dev/v1/chain/storage", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "chain": "base",
    "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://tanod.dev/v1/chain/storage",
        json={
            "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "chain": "base",
            "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

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