The Moonbeam XCM SDK enables developers to easily transfer assets between chains, either between parachains or between a parachain and the relay chain, within the Polkadot/Kusama ecosystem. With the SDK, you don't need to worry about determining the multilocation of the origin or destination assets or which extrinsics are used on which networks to send XCM transfers.

The XCM SDK offers helper functions that provide a very simple interface to execute XCM transfers between chains in the Polkadot/Kusama ecosystem. In addition, the XCM config package allows any parachain project to add their information in a standard way, so they can be immediately supported by the XCM SDK.

Documentation

You can find the documentation at https://moonbeam-foundation.github.io/xcm-sdk/latest/.

Installation

npm i @moonbeam-network/xcm-sdk

⚠️ You need to have peer dependencies of SDK installed as well.

npm i @polkadot/api @polkadot/util-crypto

Usage

The following sections contain basic examples of how to work with the XCM SDK to build transfer data to transfer an asset from one chain to another and how to submit the transfer. For a detailed overview on how to use it, please refer to the XCM SDK docs.

Build XCM Transfer Data

import { Sdk } from '@moonbeam-network/xcm-sdk';

const fromPolkadot = async () => {
  const transferData = await Sdk()
    .setAsset(dot)
    .setSource(polkadot) 
    .setDestination(moonbeam)
    .setAddresses({
      sourceAddress: pair.address,
      destinationAddress: "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
    });
};

fromPolkadot();

Transfer

...

const hash = await data.transfer({
  amount: 1,
  signers: { polkadotSigner: pair }, // Insert the signer, in this case a Substrate key pair
});

Examples

• sdk

git clone git@github.com:moonbeam-foundation/xcm-sdk.git
cd xcm-sdk
pnpm install
cd examples/sdk-simple

# edit index.ts by adding your accounts

pnpm run start

Contributing

First fork the repository and clone it.

git clone git@github.com:YOUR_GITHUB_USERNAME/xcm-sdk.git
pnpm install

Optionally, you can install the pre-commit hook to run the linter and tests before committing:

pnpm lefthook install

Tests

Unit tests

pnpm run test

Acceptance tests

pnpm run test:acc

Release

To create a dev version go to GitHub actions and run publish dev versions workflow.

To create a release version run:

pnpm run changeset

Testing the change in the SDK locally

Build the project:

pnpm run build

Link the SDK:

pnpm run clean && pnpm run build && pnpm run link

In your project where you would like to test the changes:

pnpm link @moonbeam-network/xcm-types @moonbeam-network/xcm-utils @moonbeam-network/xcm-builder @moonbeam-network/xcm-config @moonbeam-network/xcm-sdk

If you need you can link other packages too.

After testing is done, unlink the SDK:

pnpm unlink @moonbeam-network/xcm-types @moonbeam-network/xcm-utils @moonbeam-network/xcm-builder @moonbeam-network/xcm-config @moonbeam-network/xcm-sdk