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/api-augment @polkadot/types @polkadot/util @polkadot/util-crypto @polkadot/apps-config ethers

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 each method, including a reference to the parameters and returned data of each method exposed by the SDK, please refer to the XCM SDK docs.

Build XCM Transfer Data

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

const { assets, getTransferData } = Sdk();

// You can build the XCM transfer data via the assets function
const dataViaAssetsMethod = await assets()
  .asset('INSERT_ASSET')
  .source('INSERT_SOURCE_CHAIN')
  .destination('INSERT_DESTINATION_CHAIN')
  .accounts('INSERT_SOURCE_ADDRESS', 'INSERT_DESTINATION_ADDRESS', {
    evmSigner?: 'INSERT_EVM_SIGNER',
    polkadotSigner?: 'INSERT_POLKADOT_SIGNER',
  });

// Or via the getTransferData function
const dataViaGetTransferDataMethod = await getTransferData({
  destinationAddress: 'INSERT_DESTINATION_ADDRESS',
  destinationKeyOrChain: 'INSERT_DESTINATION_CHAIN',
  evmSigner?: 'INSERT_EVM_SIGNER',
  keyOrAsset: 'INSERT_ASSET',
  polkadotSigner?: 'INSERT_POLKADOT_SIGNER',
  sourceAddress: 'INSERT_SOURCE_ADDRESS',
  sourceKeyOrChain: 'INSERT_SOURCE_CHAIN',
});

Transfer

...

const hash = await dataViaGetTransferDataMethod.transfer('INSERT_TRANSFER_AMOUNT');

Examples

• sdk

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

# edit index.ts by adding your accounts

npm start

Contributing

git clone git@github.com:moonbeam-foundation/xcm-sdk.git
npm i
npm run dev

Tests

Unit tests

npm run test

Acceptance tests

cp .env.example .env
# add private key and suri to .env file

npm 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:

npm run changeset

Testing the change in the SDK locally

Build the project:

npm run build

npm run link

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

npm 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:

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