Transactions

set-crowdloan-max-contribution

Set or clear the per-contributor max for a non-finalized crowdloan (creator only).

Caps how much any single contributor can put in, useful to keep a raise broadly distributed. Omitting the amount clears the limit. Only the creator may change it, and only while the loan has not been finalized.

Signer	Origin	Pallet	Wraps
`coldkey`	signed account (pallet role may apply)	Crowdloan	`Crowdloan.set_max_contribution`

Parameters

Parameter	Type	Required	Description
`crowdloan_id`	integer	yes	Identifier of the crowdloan, assigned when it was created.
`new_max_contribution_tao`	number \| `"all"`	no	Largest total any single contributor may put in. Omit to clear the limit.

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 set-crowdloan-max-contribution \
  --crowdloan-id <int> --dry-run
btcli tx set-crowdloan-max-contribution \
  --crowdloan-id <int> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SetCrowdloanMaxContribution(crowdloan_id=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("set_crowdloan_max_contribution", {...}, wallet)

On-chain implementation

Crowdloan.set_max_contribution — pallets/crowdloan/src/lib.rs#L935:

#[pallet::call_index(9)]
#[pallet::weight(T::WeightInfo::set_max_contribution())]
pub fn set_max_contribution(
    origin: OriginFor<T>,
    #[pallet::compact] crowdloan_id: CrowdloanId,
    new_max_contribution: Option<BalanceOf<T>>,
) -> DispatchResult {
    let who = ensure_signed(origin)?;

    let crowdloan = Self::ensure_crowdloan_exists(crowdloan_id)?;
    ensure!(!crowdloan.finalized, Error::<T>::AlreadyFinalized);

    // Only the creator can update the max contribution.
    ensure!(who == crowdloan.creator, Error::<T>::InvalidOrigin);

    if let Some(max_contribution) = new_max_contribution {
        let creator_contribution =
            Contributions::<T>::get(crowdloan_id, &crowdloan.creator)
                .unwrap_or_else(Zero::zero);
        ensure!(
            max_contribution >= crowdloan.min_contribution
                && max_contribution >= creator_contribution,
            Error::<T>::MaximumContributionTooLow
        );
        MaxContributions::<T>::insert(crowdloan_id, max_contribution);
    } else {
        MaxContributions::<T>::remove(crowdloan_id);
    }

    Self::deposit_event(Event::<T>::MaxContributionUpdated {
        crowdloan_id,
        new_max_contribution,
    });
    Ok(())
}

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