start-call

Flips a freshly registered subnet from inactive to active: the subnet token becomes tradable and alpha emission into the subnet's epochs begins. It does not enable the subnet's share of TAO emission — that additionally requires the root-gated emission-enabled flag, which only root can set. Owner-only, callable once per subnet, and only after the chain's minimum delay since the subnet was registered — calling too early fails. Until this is called the subnet earns nothing, so run it as soon as the delay allows.

Parameters

Address parameters (--hotkey, --coldkey, --dest, ...) accept a raw ss58 address, an address-book or proxy-book name, or a local wallet/hotkey name.

CLI

Preview with --dry-run (shows fee, effects, and policy result without submitting), then submit:

btcli tx start-call \
  --netuid <int> --dry-run
btcli tx start-call \
  --netuid <int> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.StartCall(netuid=1)

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)

(bt.Subtensor is also the async client — async with bt.Subtensor() as client: — see The client.) Or build the intent by op name, as an agent would:

result = sub.execute_tool("start_call", {...}, wallet)

On-chain implementation

SubtensorModule.start_call — pallets/subtensor/src/macros/dispatches.rs#L1539:

#[pallet::call_index(92)]
#[pallet::weight(<T as crate::pallet::Config>::WeightInfo::start_call())]
pub fn start_call(origin: OriginFor<T>, netuid: NetUid) -> DispatchResult {
    Self::do_start_call(origin, netuid)?;
    Ok(())
}

Delegates to do_start_call.

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