state_queryStorageAt

Query multiple storage keys at a specific block on Bridge Hub.

Use Cases

• Batch queries - Efficiently query multiple storage items
• Snapshot state - Get consistent multi-key state for trustless ETH and ERC-20 bridging, cross-chain messaging, and parachain-to-Ethereum asset transfers
• Data analysis - Compare storage across blocks

Parameters

Parameter	Type	Required	Description
keys	Array	Yes	Array of storage keys
blockHash	String	No	Block hash for query

Request

{
  "jsonrpc": "2.0",
  "method": "state_queryStorageAt",
  "params": [[""]],
  "id": 1
}

Code Examples

cURL

curl https://api-bridge-hub-polkadot.n.dwellir.com/YOUR_API_KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "state_queryStorageAt",
    "params": [[""]],
    "id": 1
  }'

JavaScript

import { ApiPromise, WsProvider } from '@polkadot/api';

const provider = new WsProvider('wss://api-bridge-hub-polkadot.n.dwellir.com/YOUR_API_KEY');
const api = await ApiPromise.create({ provider });

// Query multiple accounts at once
const accounts = ['5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY'];
const entries = await api.query.system.account.multi(accounts);

entries.forEach((info, idx) => {
  console.log(`Account ${idx}: ${info.data.free.toString()}`);
});

await api.disconnect();

Related Methods

• state_getStorage - Single storage query
• state_getKeysPaged - Enumerate keys