Asset Hub XCM Builder

A static web page that generates call data and call hash for polkadotXcm.transferAssetsUsingTypeAndThen, transferring the native token between the Polkadot and Kusama Asset Hubs (DOT ⇄ KSM), optionally wrapped in proxy.proxy.

It connects to a public RPC of the source chain to fetch live metadata, encodes the call entirely in the browser, and never signs or submits anything. Always verify the output before signing.

Develop

npm install
npm run dev

Build

npm run build      # outputs static site to dist/

Updating chain metadata

The PAPI descriptors in .papi/ are committed so builds are deterministic. After a runtime upgrade, refresh them with:

npx papi update     # re-fetch metadata for the configured chains
npx papi generate