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Chain Storage

by Contract storage slot in Documents & files

x402 APIPassing, checked 3 h ago

Read one 32-byte storage slot from a contract, the raw state under whatever the source code calls it. Returns the word as hex plus three readings of the same bytes - unsigned integer, address (low 20 bytes) and boolean - because a slot is untyped on chain and only the caller knows which it meant. Useful for proxy implementation slots, paused flags and any value the ABI does not expose. EVM chains: ethereum, base, polygon, arbitrum, optimism.

GET https://agent402.tools/api/chain/storage

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
197 ms typical, 234 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X GET "https://agent402.tools/api/chain/storage?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&network=base&slot=0x0"
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fchain%2Fstorage
const res = await pay("https://agent402.tools/api/chain/storage?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&network=base&slot=0x0");
console.log(await res.json());

Example input

{
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "network": "base",
  "slot": "0x0"
}

Example output

{
  "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "asAddress": "0x0000000000000000000000000000000000000001",
  "asBool": true,
  "asUint": "1",
  "block": "latest",
  "network": "base",
  "slot": "0x0",
  "value": "0x0000000000000000000000000000000000000000000000000000000000000001"
}

Security scan

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

Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402234 ms$0.001
6 h agoPassed402186 ms$0.001
10 h agoPassed402186 ms$0.001
14 h agoPassed402189 ms$0.001
17 h agoPassed402204 ms$0.001
22 h agoPassed402197 ms$0.001
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33 h agoPassed402639 ms$0.001