Adding test networks to MetaMask allows developers to build and test decentralized applications (dApps) without using real cryptocurrencies. This article provides a step-by-step guide to add Polygon Mumbai to MetaMask. We’ll explore Chainlist, a platform that makes it easy to add various EVM networks, as well as manually enter the testnet details.
TL;DR
This guide outlines two methods to connect the Polygon Mumbai testnet to MetaMask – using Chainlist or manually entering the network details. ChainList is recommended as it reduces manual entry errors.
Platform Details: ChainList
Chainlist is an aggregator of Ethereum Virtual Machine (EVM) networks built by Defillama. It allows connecting MetaMask to specific chains via their network ID to ensure a safe connection.
- Rating: Our rating is 5.0/5.0
- Description: Provides verified RPC endpoints and chain IDs for over 100 Layer 1 and Layer 2 networks
- Features: Automated testnet integration, regularly maintained by Defillama developers
- Compatible Wallets: MetaMask
Guide to Add Polygon Mumbai to Metamask
Using Chainlist
- Visit the Chainlist website and connect your MetaMask wallet
- Select the “Include Testnets” checkbox
- Search for “Polygon Mumbai” and click “Add to MetaMask”
- The testnet will be automatically added
Manual Method
If adding manually, use the following details:
- Network Name: Mumbai
- New RPC URL: https://polygon-mumbai.infura.io/v3/API_KEY
- Chain ID: 80001
- Currency Symbol: MATIC
- Block Explorer URL: https://mumbai.polygonscan.com/
Polygon Mumbai Testnet Details
The Polygon Mumbai testnet is an Ethereum-compatible network using a Proof-of-Authority consensus. It provides tools for developers like RPC endpoints, a faucet for testnet tokens, and a block explorer. This creates a real-world environment for testing apps before mainnet deployment.
Benefits of Using the Polygon Mumbai Testnet
- Save on Gas Fees – Transactions on the testnet are free, allowing developers to test applications without spending real cryptocurrency.
- Network Scalability Testing – As Polygon aims to scale Ethereum, Mumbai replicates the mainnet congestion and allows testing congestion-related features.
- Bugs and Issues Finding – Any bugs discovered on the testnet can be fixed before deploying to the live network, reducing the risk of losses.
- Feature Experimentation – Developers can experiment with new features, economics models, and token functionality without risk to users.
- Network Monitoring – Key metrics like transactions per second, block time, and infrastructure performance can be evaluated.
Applications of Polygon Mumbai
Many projects build and test dApps on Polygon Mumbai prior to mainnet launch, including:
- Games: Pegaxy, Plant vs Undead
- Decentralized exchanges: QuickSwap, PolyMarket
- Lending protocols: Aave, Compound
- NFT platforms: Opensea, NBA Top Shot
Conclusion
In summary, both Chainlist and manual entry can connect MetaMask to the Polygon Mumbai testnet. However, Chainlist reduces the chance of error due to its verified network details. The Mumbai testnet offers developers key tools for building, testing, and deploying dApps on Polygon’s EVM-compatible network.
