# swap-basket-many (/docs/tx/swap-basket-many)

The runtime flushes queued dividends and values the fund once, then applies every
`swap_basket` guardrail to each leg in order. If any leg fails, all trade legs roll
back; the dividend flush remains settled. Each leg is an object with
`origin_netuid`, `dest_netuid`, `amount`, and optional `min_amount_out`.
Amounts use the origin subnet's alpha unit and floors use the destination subnet's
alpha unit (TAO for netuid 0).

| Signer    | Origin                                 | Pallet          | Wraps                                                                                              |
| --------- | -------------------------------------- | --------------- | -------------------------------------------------------------------------------------------------- |
| `coldkey` | signed account (pallet role may apply) | SubtensorModule | [`SubtensorModule.swap_basket_many`](/code/pallets/subtensor/src/macros/dispatches.rs#L2310-L2321) |

## Parameters [#parameters]

| Parameter     | Type            | Required | Description                                                                                                                                 |
| ------------- | --------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| `hotkey_ss58` | string          | yes      | Root-registered validator whose basket to rebalance.                                                                                        |
| `legs`        | array of object | yes      | One to 128 ordered trade objects: origin\_netuid, dest\_netuid, amount, and optional min\_amount\_out. The entire trade sequence is atomic. |

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

## CLI [#cli]

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

```bash
btcli tx swap-basket-many \
  --hotkey <ss58|name> \
  --legs <a,b,c> --dry-run
btcli tx swap-basket-many \
  --hotkey <ss58|name> \
  --legs <a,b,c> -w my_coldkey
```

## Python [#python]

```python
import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SwapBasketMany(hotkey_ss58="5F...", legs=[...])

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](/docs/concepts/client).) Or build the intent by op name, as
an agent would:

```python
result = sub.execute_tool("swap_basket_many", {...}, wallet)
```

## On-chain implementation [#on-chain-implementation]

`SubtensorModule.swap_basket_many` — [`pallets/subtensor/src/macros/dispatches.rs#L2312`](/code/pallets/subtensor/src/macros/dispatches.rs#L2310-L2321):

```rust
#[pallet::call_index(151)]
#[pallet::weight((Pallet::<T>::swap_basket_many_declared_weight(legs.len() as u32), DispatchClass::Normal, Pays::Yes))]
pub fn swap_basket_many(
    origin: OriginFor<T>,
    hotkey: T::AccountId,
    legs: BoundedVec<(NetUid, NetUid, AlphaBalance, u64), ConstU32<MAX_BASKET_SWAP_LEGS>>,
) -> DispatchResultWithPostInfo {
    let coldkey: T::AccountId = ensure_signed(origin)?;
    let weight = Self::do_swap_basket_many_tracked(coldkey, hotkey, legs.as_slice())
        .map_err(|(done, error)| Self::fail_with_weight(error, done))?;
    Ok((Some(weight), Pays::Yes).into())
}
```

Delegates to [`do_swap_basket_many_tracked`](/code/pallets/subtensor/src/staking/basket_trade.rs#L207), [`fail_with_weight`](/code/pallets/subtensor/src/staking/stake_utils.rs#L1298).

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