Transactions

swap-stake

Swap stake on one hotkey between two subnets.

Moves part of a position from the origin subnet to the destination subnet while staying on the same hotkey: the alpha is swapped to TAO in the origin pool and then to alpha in the destination pool, so both legs can incur slippage. By default the call is slippage-protected: it fails (SlippageTooHigh) instead of filling once the origin/destination price ratio falls more than rate_tolerance (5%) below the ratio at submission — raise the tolerance or set slippage_protection to False to execute at any price. The two netuids must differ (SameNetuid). Use move_swap_stake (or move_stake) when the hotkey should change too, and remove_stake plus add_stake only if you want to control each leg separately. Pass all to swap the entire origin position; on chain (spec 469+) alpha_amount = u64::MAX means the same, resolved against the live position at execution. A call that fails is charged the work it did, not its declared weight.

Signer	Origin	Pallet	Wraps
`coldkey`	signed account (pallet role may apply)	SubtensorModule	`SubtensorModule.swap_stake`, `SubtensorModule.swap_stake_limit`

Parameters

Parameter	Type	Required	Description
`hotkey_ss58`	string	yes	Hotkey the stake is held on (the validator backing the position).
`origin_netuid`	integer	yes	Subnet the stake currently sits on.
`dest_netuid`	integer	yes	Subnet the stake ends up on. When it differs from the origin, the position is swapped through both subnet pools, which can incur slippage on each leg.
`amount_alpha`	number \| `"all"`	yes	How much of the origin position to swap across, or `all`.
`slippage_protection`	boolean	no	Bound the price the swap may execute at (on by default): the call fails (`SlippageTooHigh`) instead of filling once the pool price moves more than `rate_tolerance` from the price at submission. Disable to execute at any price.
`rate_tolerance`	number	no	Maximum price move slippage protection accepts, as a fraction (0.05 = 5%). Ignored when slippage protection is disabled.

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 swap-stake \
  --hotkey <ss58|name> \
  --origin-netuid <int> \
  --dest-netuid <int> \
  --amount-alpha <amount|all> --dry-run
btcli tx swap-stake \
  --hotkey <ss58|name> \
  --origin-netuid <int> \
  --dest-netuid <int> \
  --amount-alpha <amount|all> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SwapStake(hotkey_ss58="5F...", origin_netuid=1, dest_netuid=2, amount_alpha=1.0)

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("swap_stake", {...}, wallet)

On-chain implementation

SubtensorModule.swap_stake — pallets/subtensor/src/macros/dispatches.rs#L1439:

#[pallet::call_index(87)]
#[pallet::weight((
    <T as crate::pallet::Config>::WeightInfo::swap_stake()
        .saturating_add(Pallet::<T>::staking_hotkeys_walk_bound()),
    DispatchClass::Normal,
    Pays::Yes
))]
pub fn swap_stake(
    origin: OriginFor<T>,
    hotkey: T::AccountId,
    origin_netuid: NetUid,
    destination_netuid: NetUid,
    alpha_amount: AlphaBalance,
) -> DispatchResultWithPostInfo {
    let coldkey = ensure_signed(origin.clone())?;
    Self::with_actual_weight(
        Self::do_swap_stake(
            origin,
            hotkey,
            origin_netuid,
            destination_netuid,
            alpha_amount,
        ),
        <T as crate::pallet::Config>::WeightInfo::swap_stake()
            .saturating_add(Self::staking_hotkeys_walk_actual(&coldkey)),
    )
}

Delegates to with_actual_weight, do_swap_stake, staking_hotkeys_walk_actual.

SubtensorModule.swap_stake_limit — pallets/subtensor/src/macros/dispatches.rs#L1608:

#[pallet::call_index(90)]
#[pallet::weight((
    <T as crate::pallet::Config>::WeightInfo::swap_stake_limit()
        .saturating_add(Pallet::<T>::staking_hotkeys_walk_bound()),
    DispatchClass::Normal,
    Pays::Yes
))]
pub fn swap_stake_limit(
    origin: OriginFor<T>,
    hotkey: T::AccountId,
    origin_netuid: NetUid,
    destination_netuid: NetUid,
    alpha_amount: AlphaBalance,
    limit_price: TaoBalance,
    allow_partial: bool,
) -> DispatchResultWithPostInfo {
    let coldkey = ensure_signed(origin.clone())?;
    Self::with_actual_weight(
        Self::do_swap_stake_limit(
            origin,
            hotkey,
            origin_netuid,
            destination_netuid,
            alpha_amount,
            limit_price,
            allow_partial,
        ),
        <T as crate::pallet::Config>::WeightInfo::swap_stake_limit()
            .saturating_add(Self::staking_hotkeys_walk_actual(&coldkey)),
    )
}

Delegates to with_actual_weight, do_swap_stake_limit, staking_hotkeys_walk_actual.

Every file is browsable under /code exactly as built into the runtime, or as plain text under /code/raw/<path> (index: /code/index.json).