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Installation

Magic interacts with the Polkadot blockchain via Magic’s extension NPM package @magic-ext/polkadot. The Polkadot extension also lets you interact with the blockchain using methods from polkadot-js.
NOTEYou can skip straight to our kitchen sink example directly:Polkadot Example
npm install --save @magic-ext/polkadot

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Initialization

JavaScript
import { Magic } from 'magic-sdk';
import { PolkadotExtension } from '@magic-ext/polkadot';

const magic = new Magic('YOUR_API_KEY', {
  extensions: [
    new PolkadotExtension({
      rpcUrl: 'polkadot rpc url',
    }),
  ],
});

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Common Methods

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Get User Info

Using getAccount function to get Polkadot public address for current user.
JavaScript
import { Magic } from 'magic-sdk';
import { PolkadotExtension } from '@magic-ext/polkadot';

const magic = new Magic('YOUR_API_KEY', {
  extensions: [
    new PolkadotExtension({
      rpcUrl: 'polkadot rpc url',
    }),
  ],
});

// Get user's Polkadot public address
const publicAddress = await magic.polkadot.getAccount();
console.log('Polkadot Public Address: ', publicAddress);

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Send Transaction

To send a standard Polkadot blockchain transaction, you can call the magic.polkadot.sendTransaction method.
JavaScript
import { Magic } from 'magic-sdk';
import { PolkadotExtension } from '@magic-ext/polkadot';

const magic = new Magic('YOUR_API_KEY', {
  extensions: [
    new PolkadotExtension({
      rpcUrl: 'polkadot rpc url',
    }),
  ],
});

const tx = await magic.polkadot.sendTransaction(
  // to address
  '5H3pELHbg9skXE2HfLqP23UPgrgu2Juj55CH6sdDGWc2HKNs',
  1000000000000000, // amount
);

console.log('transaction hash', tx);

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Smart Contract

To call a Polkadot blockchain contract as transaction, you can call the magic.polkadot.contractCall method.
JavaScript
import { Magic } from 'magic-sdk';
import { PolkadotExtension } from '@magic-ext/polkadot';

const magic = new Magic('YOUR_API_KEY', {
  extensions: [
    new PolkadotExtension({
      rpcUrl: 'polkadot rpc url',
    }),
  ],
});

const api = await ApiPromise.create({
  provider: new WsProvider('polkadot rpc url'),
});
await api.isReady;
const abi = new Abi(api.registry, contractABI);

const data = abi.messages.flip();

const tx = await magic.polkadot.contractCall(
  // contract address
  '5C52CfgkwANdFuN3VgPSprQwNWKfkLWMHJbMRzp12h4YarCa',
  0, // value
  1000000, // max gas
  data, // contract data
);

console.log('transaction hash', tx);

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Deploy ink contract on substrate

Please follow substrate documention to create and deploy contract on substrate.

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Resources