Open HRMP Channel between Astar Network & Composable


Composable Finance proposes to establish XCM communication between Astar Network and Composable (Composable’s Polkadot parachain) by opening HRMP channels. This will involve actions on both chains and is the first step towards integrating Astar Network with Centauri, Composable’s IBC transfer protocol.


Our proposal is to open a bi-directional channel between Astar Network and Composable. The primary objective is to support Astar Network on Centauri and establish connections with the following chains:

  • Parachains on Kusama, including Astar’s canary parachain - the Shiden network, should the proposal to open Picasso <> Shiden channel be approved.
  • Picasso and protocols built on Picasso, such as the Pablo DEX.
  • IBC-enabled Cosmos chains, NEAR Protocol, and Ethereum once these connections go live.


Although there is no on-chain proposal available, this post serves as an official proposal between Composable and Astar Network. The proposal aims to open a bi-directional channel between Astar Network and Composable to support Astar Network on Centauri.

The IBC protocol previously allowed for trustless bridging between Cosmos SDK chains; however, we are the first to extend IBC to other ecosystems. Centauri is an extension of the IBC protocol that will facilitate trustless cross-ecosystem communication among various blockchains, including Polkadot, Kusama, Ethereum, NEAR, and Cosmos.

Centauri is now live and currently supporting Kusama, Polkadot, Statemine, Picasso, and Composable. Our team is currently working on integrating a cohort of parachains with Centauri, and Astar Network would be involved in this process should the proposal be approved.


To read an overview of Centauri and the importance of the architecture of our IBC implementation on Picasso and Composable, read our docs.

To read about the importance of trustless bridging, check out our medium.

Technical details

The procedure for opening the channels is as follows:

  1. Composable initiates a proposal to open a bidirectional HRMP channel between Composable and Astar Network (this forum post).
  2. Wait for the proposal to be approved.
  3. Composable proposes to open a HRMP channel from Composable to Astar via an on-chain transaction.
  4. Astar Network approves this call, thereby opening the Composable → Astar HRMP channel.
  5. Astar Network proposes to open an Astar → Composable HRMP channel. This may be done at the same time via an Astar MultiSig Governance Batch call.
  6. Composable approves a call from Astar, thereby opening the Astar → Composable HRMP channel.
  7. Wait for another session on Polkadot for the change to be effective.

Ensure that the parachain’s sovereign account contains at least 10 DOT to be locked as collateral (5 for each channel direction), plus some DOT to pay for XCM execution fees, as this is a prerequisite.


Lets get it…composable is coming to life one step at a time

1 Like

I’m glad to see Composable connect with Astar, I’ve been wanting this to happen and explore the Composable ecosystem for a while.

1 Like

Really excited! Looking forward to it!

1 Like

This is something I was waiting for. Let’s go.

This should be one of our top priorities. Spread and connect! :v:

Open HRMP Channel between Astar <> Composable
  • Yes
  • No

0 voters

1 Like