state_subscribestorage bittensor

Substrate native JSON-RPC method. Call against a GetBlock endpoint configured for the Substrate interface. For typed SDK access, use Polkadot.js (TypeScript) or substrateinterface (Python).

WebSocket-only method. This method requires the WebSocket transport at wss://go.getblock.io/<ACCESS-TOKEN>/. It will not work via HTTP POST.

Subscribes to changes at given storage keys. Returns a subscription ID; updates arrive as separate WebSocket messages with method state_storage. Pass an array of keys to watch multiple slots in a single subscription.

Parameters

Parameter

Type

Required

Description

keys

array of string

Yes

Array of hex-encoded storage keys to watch

Request Example

# WebSocket-only method. Use wscat (or similar) to connect first:
wscat -c 'wss://go.getblock.io/<ACCESS-TOKEN>/'

# Then send:
{"jsonrpc": "2.0", "method": "state_subscribeStorage", "params": [["0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"]], "id": "getblock.io"}

import WebSocket from 'ws';

const ws = new WebSocket('wss://go.getblock.io/<ACCESS-TOKEN>/');

ws.on('open', () => {
    ws.send(JSON.stringify({
    "jsonrpc": "2.0",
    "method": "state_subscribeStorage",
    "params": [
        [
            "0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"
        ]
    ],
    "id": "getblock.io"
}));
});

ws.on('message', (data) => {
    console.log(JSON.parse(data.toString()));
});

import asyncio
import json
import websockets

async def main():
    async with websockets.connect('wss://go.getblock.io/<ACCESS-TOKEN>/') as ws:
        await ws.send(json.dumps({
    "jsonrpc": "2.0",
    "method": "state_subscribeStorage",
    "params": [
        [
            "0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"
        ]
    ],
    "id": "getblock.io"
}))
        async for message in ws:
            print(json.loads(message))

asyncio.run(main())

use tokio_tungstenite::connect_async;
use tokio_tungstenite::tungstenite::Message;
use serde_json::json;
use futures_util::{SinkExt, StreamExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let (mut ws_stream, _) = connect_async("wss://go.getblock.io/<ACCESS-TOKEN>/").await?;

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "state_subscribeStorage",
        "params": [
                [
                        "0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"
                ]
        ],
        "id": "getblock.io"
});
    ws_stream.send(Message::Text(payload.to_string())).await?;

    while let Some(msg) = ws_stream.next().await {
        println!("{:?}", msg?);
    }
    Ok(())
}

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "F4dG5hI6jK7lM8nO9pQ0r"
}

Response Parameters

Field

Type

Description

result

string

Subscription ID for storage change notifications

Use Cases

Real-time tracking of account balances or specific storage slots
Reactive UIs that update on chain state changes
Subnet/neuron monitoring (subscribe to specific neuron storage slots)

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid <ACCESS-TOKEN>

-32602

Invalid params

Request parameters are missing or malformed

-32601

Method not found

Method does not exist on this interface — check whether you're calling a Substrate method on an EVM endpoint or vice versa

-32603

Internal error

Server-side error while processing the request

429

Too Many Requests

Rate limit exceeded for your plan

SDK Integration

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

const provider = new WsProvider('wss://go.getblock.io/<ACCESS-TOKEN>/');
const api = await ApiPromise.create({ provider });

// Typed wrapper: api.rpc.state.subscribeStorage(...)
const result = await api.rpc.state.subscribeStorage(["0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"]);
console.log(result.toHuman());

// Or use the raw RPC interface for any method:
// const raw = await api.rpc.send({ method: 'state_subscribeStorage', params: [["0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"]] });

from substrateinterface import SubstrateInterface

substrate = SubstrateInterface(url="wss://go.getblock.io/<ACCESS-TOKEN>/")

# Generic RPC call:
result = substrate.rpc_request("state_subscribeStorage", [["0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9"]])
print(result)

Was this helpful?