# add-stake-limit (/docs/tx/add-stake-limit)

Same as `add_stake` except the TAO-to-alpha swap only executes while the
pool price stays within the limit. With `allow_partial` the call stakes
as much as fits under the limit and leaves the rest in the free balance;
without it the whole call fails once the limit would be breached. Like
`add_stake`, the amount must be at least the chain minimum of 0.002 TAO
plus the swap fee (`AmountTooLow`). Prefer this over plain `add_stake`
for large amounts or thin pools, where the swap itself moves the price.

| Signer    | Origin                                 | Pallet          | Wraps                                                                                             |
| --------- | -------------------------------------- | --------------- | ------------------------------------------------------------------------------------------------- |
| `coldkey` | signed account (pallet role may apply) | SubtensorModule | [`SubtensorModule.add_stake_limit`](/code/pallets/subtensor/src/macros/dispatches.rs#L1391-L1410) |

## Parameters [#parameters]

| Parameter         | Type              | Required | Description                                                                                                                                          |
| ----------------- | ----------------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `hotkey_ss58`     | string            | yes      | Hotkey the stake is added to (the validator you are backing).                                                                                        |
| `netuid`          | integer           | yes      | Subnet the stake lives on (netuid 0 is the root network).                                                                                            |
| `amount_tao`      | number \| `"all"` | yes      | How much of the coldkey's free balance to stake.                                                                                                     |
| `limit_price_rao` | integer           | yes      | Worst pool price you will accept for the swap. The call fails (or fills partially when allow-partial is set) instead of executing beyond this price. |
| `allow_partial`   | boolean           | no       | Execute whatever portion fits within the limit price and drop the remainder, instead of failing the whole call when the limit would be breached.     |

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 add-stake-limit \
  --hotkey <ss58|name> \
  --netuid <int> \
  --amount-tao <amount|all> \
  --limit-price-rao <int> --dry-run
btcli tx add-stake-limit \
  --hotkey <ss58|name> \
  --netuid <int> \
  --amount-tao <amount|all> \
  --limit-price-rao <int> -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.AddStakeLimit(hotkey_ss58="5F...", netuid=1, amount_tao=1.0, limit_price_rao=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](/docs/concepts/client).) Or build the intent by op name, as
an agent would:

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

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

`SubtensorModule.add_stake_limit` — [`pallets/subtensor/src/macros/dispatches.rs#L1393`](/code/pallets/subtensor/src/macros/dispatches.rs#L1391-L1410):

```rust
#[pallet::call_index(88)]
#[pallet::weight(<T as crate::pallet::Config>::WeightInfo::add_stake_limit())]
pub fn add_stake_limit(
    origin: OriginFor<T>,
    hotkey: T::AccountId,
    netuid: NetUid,
    amount_staked: TaoBalance,
    limit_price: TaoBalance,
    allow_partial: bool,
) -> DispatchResult {
    Self::do_add_stake_limit(
        origin,
        hotkey,
        netuid,
        amount_staked,
        limit_price,
        allow_partial,
    )
    .map(|_| ())
}
```

Delegates to [`do_add_stake_limit`](/code/pallets/subtensor/src/staking/add_stake.rs#L95).

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)).