Polkadot

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.

note

You can skip straight to our kitchen sink example directly:

👉 Polkadot Example

npm install --save @magic-ext/polkadot

Initializing Extension

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 Info

Get Account

Using getAccount function to get Polkadot public address for current user.

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

Send Transaction

To send a standard Polkadot blockchain transaction, you can call the magic.polkadot.sendTransaction method.

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)

Smart Contract

Deploy ink contract on substrate

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

Call Extension Method

To call a Polkadot blockchain contract as transaction, you can call the magic.polkadot.contractCall method.

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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