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Building with Polygon – DEV Community

With growing demand Ethereum has grow to be costly and sluggish. This created an pressing want for scaling options. That is the place Polygon is available in.

Merely put, Polygon is an Ethereum scaling platform. Polygon has seen exponential progress over the previous 12 months. It is easy to make use of and does not sacrifice the safety and decentralization offered by Ethereum. It makes use of Ethereum’s know-how, so builders can leap onto Polygon and primarily use the identical code and instruments.

I am very impressed by the Polygon Ecosystem. I have been utilizing and constructing with Polygon; it is time to put my findings into this publish.

Here is what we’ll be masking:

  • Why do we’d like scaling options on Ethereum
  • What’s Polygon?
  • Learn how to create a wise contract on Polygon

Why do we have to scale?

Firstly, blockchain is a shared and immutable ledger. On the blockchain, the knowledge is distributed amongst a number of computer systems which work collectively to supply the underlying infrastructure.

Ethereum is a brilliant contract platform that’s constructed utilizing blockchain know-how. Ethereum has grow to be more and more widespread.

First, Decentralized Finance(DeFi) acquired many individuals enthusiastic about crypto and onboarded the adventurous finance folks onto the ecosystem. I missed that stage; it was referred to as “DeFi summer season.”

Then there was the NFT wave. It was a interval that onboarded and is constant to onboard many to the crypto world. These are also referred to as photographs value hundreds of thousands.


With such demand, scalability turns into an enormous difficulty. Ethereum turns into sluggish and costly. The Blockchain can solely deal with a specific amount of transactions at a particular time, so when many individuals submit a transaction concurrently, this creates congestion.

We are able to summarize the problems with Ethereum as beneath:

  1. Low throughput
  2. Costly, not person pleasant.
  3. Restricted choices for specialised apps. It is a general-purpose blockchain; thus, it is not optimized for particular use circumstances.

The Ethereum crew is engaged on strategies to scale the Blockchain. One of many essential scaling updates is coming with The Merge. Nonetheless, Ethereum will nonetheless want a set of options working on high even with the updates. The vision of Ethereum is to create an answer on a world scale; this can’t be achieved by a single answer, as all methods could have their limitations. A number of options can dwell in parallel to supply the most effective expertise for the customers.

ethereum vision

That is the place scaling options come into play. Scaling options are options constructed on high of Ethereum (additionally referred to as Layer 1) to resolve the ache factors. Here is a terrific animation video on scaling options.

Polygon began with a imaginative and prescient to convey mass adoption to Ethereum. It needed to make it simple for builders to construct and handy for customers to make use of. It has shortly grow to be one of the widespread scaling options constructed on Ethereum.

What’s Polygon?

Polygon is a full suite of scaling options for Ethereum. It makes it simple for builders to construct and customers to make use of. Right here is the outline from the Polygon website:

Polygon is a decentralized Ethereum scaling platform that permits builders to construct scalable user-friendly dApps with low transaction charges with out ever sacrificing on safety.

polygon description

Polygon is each extra environment friendly and reasonably priced than instantly utilizing Ethereum. Two vital wants for adoption. It leverages the Ethereum know-how and has options that speak to the Ethereum Community.

Three builders based Polygon in 2017; the challenge was initially referred to as Matic. Regardless that it has rebranded to Polygon, the token continues to be referred to as MATIC. Matic is the cryptocurrency used to pay for transactions on Polygon. Here is a great video on Polygon with animations.

Right this moment there are over +7000 Applications that use Polygon, from widespread Decentralized Finance apps to Gaming Functions. OpenSea, Aave and Metamask are some examples.

dapp usage

So, what actually is it?

It is a set of platforms and protocols to scale the general public blockchains. It got down to provide an answer for Ethereum’s scalability points.

Polygon makes use of the principle Ethereum code. So, builders can transfer their initiatives onto Polygon with only a few modifications.

polygon developers

Polygon just isn’t 1 or 2 scaling answer(s), however as an alternative, Polygon is creating a complete ecosystem of Ethereum scaling options. It’s because totally different functions need various things. With Polygon, builders can select the components that match the necessity of their utility; since each alternative is a trade-off. This manner, functions can prioritize the options they want probably the most. For instance, if you happen to’re creating a finance utility, you’d need to optimize for safety. However alternatively, velocity could also be one of many options to prioritize for a blockchain-based recreation.

What are the Scaling Options?

Polygon has totally different options; let’s briefly speak about the most well-liked Polygon providing, that’s the Polygon Proof of Stake(PoS) chain.

pos usage Supply: Polygonscan

Polygon PoS is a scaling answer that makes use of side-chains for transaction processing and Plasma bridging framework for added safety. It is a answer that compliments Ethereum and achieves excessive velocity and low price with out sacrificing the safety from Ethereum itself. Builders can deploy their contract to Polygon, and customers can use the Polygon PoS chain as an alternative of instantly interacting with Ethereum.

The PoS chain just isn’t the one providing; there are different options on the Polygon Ecosystem.

  • Polygon Hermez: answer primarily used for Funds that makes use of “zero-knowledge proof” (ZK) know-how
  • Polygon Edge: framework for constructing Ethereum-compatible blockchain networks
  • Polygon Nightfall: privacy-focused Ethereum scaling answer for enterprises

Take a look at extra on the Polygon website

polygon scaling solutions

Excellent news: It is similar to constructing on Ethereum! There are only a few modifications wanted. So if you happen to’re an Ethereum builder, you’re already a Polygon builder. 😎

Within the subsequent half, we’ll be deploying a wise contract to the Polygon PoS chain. It is the identical steps & code from my “Intro to dApp’s: Create your dApp backend w/Solidity” publish.

Undertaking Instruments

  • Metamask Wallet: Crypto pockets.
  • Alchemy: Ethereum developer platform. We will likely be utilizing the Alchemy API to work together with Alchemy’s Polygon PoS infrastructure.
  • Hardhat: Ethereum growth setting. It comes as an npm bundle.


  1. Select your IDE and get the “solidity extension.” I’m utilizing VS Code.
  2. Create an account on Metamask and swap to the Mumbai Take a look at Community.
  3. Get your Alchemy API key. You will want to create an account on Alchemy. When logged in, create an App on the Polygon Take a look at Community(which is Polygon Mumbai). Your App settings ought to appear like the next:
    Image description
    As soon as you have created the App, head over to the app particulars and get your HTTP URL by clicking “view key” on the highest proper.
  4. Set up node.js.
  5. Get some Mumbai Take a look at Community Tokens. You will get some here.

Constructing the Good Contract

  1. Create a challenge folder and head over to its listing. Set up hardhat.
 mkdir eda-sample-smart-contract
 cd eda-sample-smart-contract
 npm init -y
 npm set up --save-dev hardhat
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  1. In your challenge listing create a hardhat challenge by working npx hardhat.
 $ npx hardhat
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  1. The setup wizard will present up. Click on enter all through and hold the default choices. Hardhat will create a pattern challenge and set up the dependencies for you.

  2. Open the challenge out of your code editor. Beneath the ‘Contracts’ folder, it’s best to see the default Greeter.sol file. “.Sol” is the file extension for the solidity language, and it is our pattern good contract. I’ve added the good contract beneath with some feedback to clarify what is going on on.

 //SPDX-License-Identifier: Unlicense
 pragma solidity ^0.8.4; // solidity model for the compiler, have to be the identical as within the settings file

 import "hardhat/console.sol";

 // create the good contract 
 contract Greeter {

     // create a variable referred to as greeting that will likely be saved within the contract 
     string non-public greeting;

     constructor(string reminiscence _greeting) {
         console.log("Deploying a Greeter with greeting:", _greeting); // print to the console 
         greeting = _greeting;

     // create a perform to present the greeting message 
     // public: capabilities are public by default, anybody studying from the contract can name it
     // view: the perform won't modify the state, it can solely return a worth
     // returns: the perform declaration tells the kind of the return worth, right here the return sort is a string 
     perform greet() public view returns (string reminiscence) {
         return greeting; 

     // create a perform to vary the greeting message 
     perform setGreeting(string reminiscence _greeting) public {
         console.log("Altering greeting from '%s' to '%s'", greeting, _greeting); // print to the console
         greeting = _greeting;
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  1. Right here is the place the code begins to vary from the Ethereum Undertaking. First, you will have to change the networks within the hardhat.config.js file to be on Polygon Take a look at Community, the one we will likely be utilizing is the: Mumbai Take a look at Community. Subsequent, get your Alchemy HTTP URL; it is wanted to speak to the Mumbai Take a look at Community from the good contract. Add it to the hardhat.config.js (see code snippet below step-6).

  2. Add your metamask non-public key to hardhat.config.js. You will get you non-public key by clicking Account Particulars –> Export Non-public Key out of your Metamask extension.


 module.exports = {
   solidity: '0.8.4', // ensure the model matches the one in good contract file 
   networks: {
     mumbai: { // change the community to the Polygon check community 
       url: ' ', // Mumbai testnet url 
       accounts: [' '], // metamask privte key- NEVER SHARE THIS!! It has entry to all of your accounts
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  1. We have to take our contract from our native machine and put it onto the Mumbai Take a look at Community. For this, we’ll use the sample-script.js file below the ‘Scripts’ folder. (It is normally referred to as deploy.js; however let’s depart it as is for this pattern challenge.) Run the command beneath to deploy the contract to the Mumbai Take a look at Community.
 npx hardhat run scripts/sample-script.js --network Mumbai
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🎉 When you see the small print of your good contract on the terminal, it signifies that your good contract is deployed onto the Mumbai Take a look at Community!

The good contract deal with is printed on the terminal. Head over to Etherscan for Polygon TestNet. Seek for your contract deal with, and you will see the small print.

What’s subsequent

Take a look at the Polygon developer page for developer assets to proceed constructing. Yow will discover full suite of assets from the Polygon Workforce and likewise curated group assets.

Price mentioning that Polygon has a Developer Support Program to assist builders within the ecosystem. Advantages embrace getting early entry to grants and technical steering. I have never been a part of this system however could possibly be attention-grabbing to take a look at!

developer support program polygon

The Polygon has crew has at all times targeted on adoption, they usually’ve grow to be one of the widespread platforms for builders. I am excited for what Polygon is doing and stay up for following intently!

When you have any questions or feedback, drop them beneath, or attain out to me on Twitter! 👩‍💻

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