This is a proposal to change the HRMP channel deposits on Polkadot from about 20,000 DOT to 1,000 DOT. I meant to include this in [motion 191](https://polkadot.polkassembly.io/motion/191) but forgot. It should be enacted at a similar time to the enactment of the v9190 or later runtime upgrade. Two notes:

1. The deposit is per one-way channel, so a bi-directional HRMP channel will require 2,000 DOT per parachain.
2. Configuration changes can take a few sessions to take effect, depending on other pending changes in the parachains protocol. Therefore, parachains should wait until the new configuration takes effect before opening channels if they want to take advantage of the lower deposit.

![preimage](https://i.imgur.com/P12Rv1H.png)

Schedule a majority-carries referendum to be tabled next once it is legal to schedule
an external referendum.

The dispatch of this call must be `ExternalMajorityOrigin`.

- `proposal_hash`: The preimage hash of the proposal.

Unlike `external_propose`, blacklisting has no effect on this and it may replace a
pre-scheduled `external_propose` call.

Weight: `O(1)`

Send a batch of dispatch calls and atomically execute them.
The whole transaction will rollback and fail if any of the calls failed.

May be called from any origin.

- `calls`: The calls to be dispatched from the same origin. The number of call must not
  exceed the constant: `batched_calls_limit` (available in constant metadata).

If origin is root then call are dispatch without checking origin filter. (This includes
bypassing `frame_system::Config::BaseCallFilter`).

# <weight>
- Complexity: O(C) where C is the number of calls to be batched.
# </weight>

- Proposal to change HRMP channel deposits on Polkadot from 20,000 DOT to 1,000 DOT
- Deposit is per one-way channel, so bi-directional channels will require 2,000 DOT per parachain
- Configuration changes can take a few sessions to take effect
- Parachains should wait for the new configuration to take effect before opening channels to take advantage of lower deposit
- Image included in the post

#192 Update HRMP Channel Deposits on Polkadot