subnetInfo_getSubnetHyperparams - Bittensor

Example code for the subnetInfo_getSubnetHyperparams JSON-RPC method. Complete guide on how to use subnetInfo_getSubnetHyperparams JSON-RPC in GetBlock Web3 documentation.

Returns just the hyperparameters governing a subnet's behavior — separated from general info for clarity. Useful for showing detailed consensus tuning data.

Bittensor-specific custom RPC method. This method is implemented by the Subtensor runtime and is not part of the standard Substrate JSON-RPC surface. Call against a GetBlock endpoint configured for the Substrate interface. The Bittensor Python SDK provides typed wrappers; standard Polkadot.js and substrateinterface require the raw RPC interface (see SDK Integration tabs below).

Parameters

Parameter	Type	Required	Description
netuid	integer	Yes	Subnet ID
blockHash	string	No	Block hash to query at

Request Example

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "subnetInfo_getSubnetHyperparams",
    "params": [
        1
    ],
    "id": "getblock.io"
}'

JavaScript (Axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "subnetInfo_getSubnetHyperparams",
    "params": [
        1
    ],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));

Python (Requests)

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "subnetInfo_getSubnetHyperparams",
    "params": [
        1
    ],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (Reqwest)

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "subnetInfo_getSubnetHyperparams",
        "params": [
                1
        ],
        "id": "getblock.io"
});

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "rho": 10,
        "kappa": 32767,
        "immunityPeriod": 4096,
        "minAllowedWeights": 8,
        "maxWeightsLimit": 65535,
        "tempo": 360,
        "minDifficulty": 10000000,
        "maxDifficulty": 9223372036854775807,
        "weightsVersion": 0,
        "weightsRateLimit": 100,
        "adjustmentInterval": 100,
        "activityCutoff": 5000,
        "registrationAllowed": true,
        "targetRegsPerInterval": 2,
        "minBurn": 1000000000,
        "maxBurn": 100000000000,
        "bondsMovingAvg": 900000,
        "maxRegsPerBlock": 1,
        "servingRateLimit": 50
    }
}

Response Parameters

Field	Type	Description
result.tempo	integer	Blocks between emission events
result.immunityPeriod	integer	Blocks during which a newly-registered neuron cannot be replaced
result.minAllowedWeights	integer	Minimum number of weight assignments a validator must submit
result.adjustmentInterval	integer	Blocks between difficulty adjustments
result.activityCutoff	integer	Blocks of inactivity before a neuron is considered inactive
result.minBurn	integer	Minimum registration burn cost (in rao)
result.maxBurn	integer	Maximum registration burn cost (in rao)
result.registrationAllowed	boolean	Whether new registrations are currently allowed on this subnet

Use Cases

• Subnet configuration dashboards

• Detecting subnet parameter changes (subnets can update hyperparams via subnet owner extrinsics)

• Helping subnet operators tune their participation strategy

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

Bittensor SDK (Python)

import bittensor as bt

# Bittensor SDK provides typed wrappers for chain-specific data.
# The subtensor client routes to the appropriate custom RPC under the hood:
subtensor = bt.subtensor(network="finney")  # or pass GetBlock URL

# Example for subnetInfo_getSubnetInfo:
# subnet_info = subtensor.get_subnet_info(netuid=1)
# print(subnet_info)

# Or use the raw RPC interface for any custom method:
result = subtensor.substrate.rpc_request("subnetInfo_getSubnetHyperparams", [1])
print(result)

Polkadot.js raw (TypeScript)

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

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

// Bittensor-specific RPCs need the raw send() interface
// (they aren't part of standard Polkadot.js typed wrappers):
const result = await api.rpc.send({
    method: 'subnetInfo_getSubnetHyperparams',
    params: [1]
});
console.log(result);