Transactions

add-stake

Stake TAO from the coldkey onto a hotkey.

Swaps TAO from the coldkey's free balance into the subnet's alpha at the current pool price and credits the result to your stake on the hotkey; on netuid 0 (root) the stake stays TAO-denominated. The swap moves the pool, so large amounts incur slippage. By default the call is slippage-protected: it fails (SlippageTooHigh) instead of filling once the price rises more than rate_tolerance (5%) above the price at submission — raise the tolerance or set slippage_protection to False to execute at any price, or use add_stake_limit to set an explicit limit price. The position's value then follows the pool price and the validator's performance, and can be exited later with remove_stake. Fails if the coldkey's free balance cannot cover the amount plus the transaction fee, and with AmountTooLow when the amount is below the chain minimum of 0.002 TAO plus the swap fee. Dynamic subnets also reject a single swap larger than 1000x the pool's TAO reserve (InsufficientLiquidity).

Signer	Pallet	Wraps
`coldkey`	SubtensorModule	`SubtensorModule.add_stake`, `SubtensorModule.add_stake_limit`

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.
`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 add-stake \
  --hotkey <ss58|name> \
  --netuid <int> \
  --amount-tao <amount|all> --dry-run
btcli tx add-stake \
  --hotkey <ss58|name> \
  --netuid <int> \
  --amount-tao <amount|all> -w my_coldkey

Python

import bittensor as sub
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = sub.AddStake(hotkey_ss58="5F...", netuid=1, amount_tao=1.0)

async with sub.Client("finney") as client:
    plan = await client.plan(intent, wallet)   # fee, effects, policy — no submission
    result = await client.execute(intent, wallet)
    if not result.success:
        print(result.error.code, result.error.remediation)

Or build it by op name, as an agent would:

await client.execute_tool("add_stake", {...}, wallet)