MetaMask is a non-custodial cryptocurrency wallet and Web3 gateway developed by Consensys that enables users to manage digital assets, interact with decentralized applications (dApps), and participate in the broader DeFi, NFT, and Web3 ecosystems. Available as a browser extension (Chrome, Firefox, Brave, Edge, Opera) and as a mobile application (iOS and Android), MetaMask began as an Ethereum-only wallet and has since expanded well beyond it. It now natively supports Bitcoin, Solana, Tron, and a growing list of other non-EVM networks alongside the Ethereum Virtual Machine (EVM)-compatible chains it was originally built for.
As a non-custodial wallet, MetaMask gives users full control over their private keys, which are stored locally on the user’s device and encrypted with a user-chosen password. When a user creates a MetaMask wallet, the application generates a 12-word Secret Recovery Phrase (also called a seed phrase) using the BIP-39 standard, from which all Ethereum account private keys are deterministically derived via the BIP-44 hierarchical deterministic (HD) wallet standard. This architecture means the user, and only the user, controls access to their funds. Consensys (MetaMask’s developer) cannot access, recover, or freeze user wallets.
MetaMask functions as a bridge between standard web browsers and blockchain networks. When a user visits a dApp (such as Uniswap, OpenSea, or Aave), MetaMask injects an Ethereum provider object (window.ethereum) into the browser’s JavaScript environment, allowing the dApp to request transaction signing, account information, and network interactions. The user sees a pop-up from MetaMask asking them to confirm or reject each transaction, providing a critical security checkpoint between dApps and the user’s funds.
Beyond the Ethereum mainnet, MetaMask supports EVM-compatible networks including Polygon, Arbitrum, Optimism, Base, BNB Chain, Avalanche, and zkSync Era, alongside natively integrated non-EVM chains such as Bitcoin, Solana, and Tron. Users can add further custom EVM networks through manual RPC configuration or automated chain-switching prompts from dApps. MetaMask has also introduced swap and bridging functionality (MetaMask Swaps), fiat on-ramp integration, tokenized real-world assets (stocks and ETFs), prediction-market access, a Mastercard-backed MetaMask Card with mUSD stablecoin cashback, and a points-based Rewards program, evolving from a simple wallet into a full Web3 platform.
As of 2026, MetaMask has surpassed 100 million cumulative downloads, and its monthly active user base has held at roughly 30 million for an extended period. That makes it one of the most widely used self-custody crypto wallets globally, alongside close competitors such as Trust Wallet. It continues to serve as a de facto standard for EVM-based dApp interaction, effectively functioning as a “connect your wallet” identity layer for much of the decentralized web.
Origin & History
2016 (September): MetaMask was created by Aaron Davis (known as “kumavis”) and Dan Finlay at Consensys, a blockchain software company founded by Ethereum co-founder Joseph Lubin. The initial release was a Chrome browser extension, published under the open-source MIT license, that allowed users to interact with Ethereum dApps directly from their browser without running a full Ethereum node. This was a major step forward. Previously, interacting with Ethereum required running the Mist browser or a local geth node.
2017 to 2018: MetaMask grew alongside the ICO (Initial Coin Offering) boom, as it was a primary wallet used to participate in Ethereum-based token sales. The CryptoKitties craze in late 2017 introduced MetaMask to mainstream audiences, as the game required a MetaMask wallet to buy, breed, and trade digital cats on Ethereum.
2019 (July): MetaMask opened a public beta of MetaMask Mobile for iOS and Android to gather user feedback ahead of a full release. The Android beta was later suspended from the Google Play Store in December 2019 over Google’s policies on financial and mining-adjacent apps.
2020 (August): MetaMask moved its codebase from the permissive MIT license to a custom, more restrictive proprietary license, a change that drew criticism from parts of the open-source community.
2020 (September): MetaMask Mobile officially launched to the public on iOS and Android, extending the wallet beyond desktop browsers. The mobile app included a built-in dApp browser, enabling users to access DeFi and NFT platforms from their phones.
2020 (June to October): “DeFi Summer” drove explosive MetaMask adoption as users needed the wallet to interact with Uniswap, Compound, Aave, Yearn, and other DeFi protocols; monthly active users grew from roughly 1 million to several million within the year. MetaMask Swaps launched on desktop in October 2020, integrating DEX aggregation directly into the wallet and giving MetaMask its first meaningful revenue stream, generated through a 0.875% service fee.
2021: MetaMask Swaps expanded to mobile in March, and the wallet crossed 10 million monthly active users during the year. The NFT boom on OpenSea and other marketplaces drove massive adoption, and multi-chain support expanded with one-click addition of Polygon, BNB Chain, Avalanche, and other EVM networks.
2022: MetaMask surpassed 30 million monthly active users. Consensys raised $450 million at a $7 billion valuation. A privacy controversy emerged when Consensys disclosed that its Infura RPC service (MetaMask’s default Ethereum node provider) collected user IP addresses and wallet addresses by default; Consensys subsequently made privacy improvements and allowed users to configure custom RPC endpoints.
2023: MetaMask Snaps launched, enabling third-party developers to extend MetaMask’s functionality with plugins for additional chains, custom transaction insights, and enhanced security features. MetaMask Portfolio launched as a unified dashboard for tracking assets across chains.
2024 to 2025: MetaMask added native support for further non-EVM and EVM networks, including Bitcoin, Solana, Tron, Monad, and Sei, moving beyond its EVM-only roots, alongside transaction simulation and phishing-detection security features. In late 2025, MetaMask launched a points-based Rewards program (initially mobile-only) tied to swaps, bridging, and referrals, alongside its Linea network.
2026: MetaMask introduced prediction-market access, tokenized real-world assets (stocks and ETFs) inside MetaMask Swaps, and a two-tier MetaMask Card (Virtual and Metal) offering Mastercard acceptance with cashback paid in its mUSD stablecoin. Cumulative downloads surpassed 100 million, and monthly active users have held at approximately 30 million. In April 2026, co-founder Dan Finlay announced his departure from Consensys after roughly a decade building the wallet, citing burnout and a wish to spend more time with family; Consensys has indicated day-to-day MetaMask operations continue under the existing team. Consensys has also indicated it is targeting a fall 2026 IPO window.
In Simple Terms
MetaMask is like a digital wallet for the blockchain world, similar to how Apple Pay or Google Pay lets you make payments with your phone. Unlike Apple Pay, though, no company controls your MetaMask wallet: you hold the keys, and only you can authorize transactions with your funds.
Think of MetaMask as a passport for the decentralized internet. Just as a physical passport lets you cross borders and access services in different countries, MetaMask lets you “connect” to thousands of blockchain applications, from trading platforms to digital art galleries to lending services, all from a single wallet.
If regular websites are like stores you can only window-shop at, MetaMask is the credit card that lets you actually buy things. Blockchain apps (dApps) display their services, but you need MetaMask to actually interact with them: swap tokens, buy NFTs, deposit into lending pools, or vote on governance proposals.
MetaMask is like a safety deposit box where you hold your own key. Banks hold your money and can freeze your account; MetaMask lets you be your own bank. Your 12-word recovery phrase is the master key. As long as you keep it safe, no one, not even MetaMask’s developers, can access your funds.
Important: MetaMask is a self-custody wallet, meaning you are solely responsible for your security. If you lose your 12-word Secret Recovery Phrase and your device, your funds are permanently unrecoverable. Never share your seed phrase with anyone. MetaMask support will never ask for it. Always verify transaction details in the MetaMask popup before confirming, since signed transactions on the blockchain are irreversible.
Key Technical Features
Hierarchical Deterministic (HD) Wallet
- MetaMask generates a 12-word BIP-39 mnemonic seed phrase during setup, which serves as the master key for the wallet’s Ethereum-based accounts
- Private keys for each Ethereum account are derived deterministically from this seed using the BIP-44 derivation path (
m/44'/60'/0'/0/n) - Users can create unlimited accounts from a single seed phrase, each with its own Ethereum address and private key
- The seed phrase can recover all Ethereum accounts and funds on any BIP-39/BIP-44-compatible wallet (Trust Wallet, Ledger, etc.)
Browser Extension Architecture (window.ethereum Provider)
- MetaMask injects a JavaScript provider object (
window.ethereum, conforming to EIP-1193) into every webpage - dApps detect MetaMask by checking for this provider and use it to request wallet connections, account addresses, and transaction signatures
- All sensitive operations (sending transactions, signing messages) require explicit user approval through MetaMask’s popup UI
- This architecture separates the dApp (untrusted code) from the wallet (trusted execution environment), providing a critical security boundary
How MetaMask Transaction Signing Works
- A user clicks a button on a dApp (for example, “Swap” on Uniswap), which triggers a transaction request through
window.ethereum - MetaMask intercepts the request and displays a confirmation popup showing the transaction details: recipient, value, gas fee estimate, and contract interaction data
- The user reviews the transaction details and either approves or rejects it in the MetaMask popup
- If approved, MetaMask signs the transaction with the user’s private key locally on the device (the private key never leaves the device)
- The signed transaction is broadcast to the network through an RPC node (default: Infura; can be changed to Alchemy, a custom node, etc.)
- MetaMask monitors the transaction status and displays confirmation or failure notifications to the user
Multi-Chain and Custom Network Support
- MetaMask natively supports Ethereum mainnet and major EVM-compatible chains (Polygon, Arbitrum, Optimism, Base, BNB Chain, Avalanche, zkSync Era, and others)
- MetaMask has also added native support for non-EVM networks, including Bitcoin, Solana, and Tron, moving the wallet beyond its original EVM-only design
- Users can manually add further EVM chains by entering the RPC URL, chain ID, currency symbol, and block explorer URL
- dApps can request automatic network switching via the
wallet_switchEthereumChainandwallet_addEthereumChainRPC methods - MetaMask Snaps further extend support to additional chains and custom functionality through third-party plugins
MetaMask Snaps Extensibility
- Snaps are sandboxed JavaScript programs that run inside MetaMask, extending its functionality without compromising core wallet security
- Developers can create Snaps for custom transaction insights, additional chain support, notification systems, and identity verification
- Snaps are installed from the MetaMask Snaps directory and require explicit user permissions for each capability they access
- The Snaps platform transforms MetaMask from a wallet into a modular, extensible Web3 platform
Security Features
- Transaction simulation previews the expected outcome (token balances before and after) before user confirmation
- Phishing detection warns users when visiting known scam websites that impersonate legitimate dApps
- Token approval management allows users to review and revoke unlimited token approvals granted to smart contracts
- Hardware wallet integration (Ledger, Trezor, Lattice1) enables cold-storage signing through MetaMask’s interface
Advantages & Disadvantages
| Advantages | Disadvantages |
|---|---|
| Non-Custodial Security: Users retain full control of private keys, which never leave their device, eliminating counterparty risk from exchange hacks or insolvency (for example, the FTX collapse) | Single Point of Failure: If a user loses their seed phrase and device simultaneously, all funds are permanently and irreversibly lost with no recovery mechanism |
| Universal dApp Compatibility: MetaMask remains a de facto standard for EVM dApp interaction, supported by the large majority of Ethereum-based applications, DEXs, NFT marketplaces, and DeFi protocols | Default RPC Privacy: MetaMask’s default Infura RPC endpoint has historically collected IP addresses paired with wallet addresses, creating potential privacy concerns unless users configure alternative RPC providers |
| Expanding Multi-Chain Support: Native connections to Ethereum, Polygon, Arbitrum, Optimism, Base, BNB Chain, and, more recently, non-EVM networks including Bitcoin, Solana, and Tron | Phishing Vulnerability: As one of the most popular wallets, MetaMask users are prime targets for phishing attacks, fake token approval scams, and social engineering (fake support agents asking for seed phrases) |
| MetaMask Snaps Extensibility: Third-party developers can extend functionality further with custom transaction insights and enhanced security features through sandboxed plugins | Gas Fee Complexity: New users often find network gas fees confusing, and gas estimation can sometimes be inaccurate, leading to stuck or failed transactions |
| Built-In Swap and Bridge Aggregation: MetaMask Swaps routes trades across multiple DEXs and networks for competitive pricing without leaving the wallet interface | Swap Fee Premium: MetaMask Swaps applies a fixed 0.875% service fee to trades, an added cost compared with the variable or lower fees sometimes available by trading directly on a single DEX |
| Hardware Wallet Integration: Smooth connection with Ledger, Trezor, and other hardware wallets combines MetaMask’s dApp compatibility with cold-storage security | Browser Extension Attack Surface: Browser extensions have broad access to web content, and malicious extensions or a compromised browser could theoretically interact with MetaMask |
| Large Ecosystem and Documentation: One of the largest user communities and among the most detailed documentation and developer support of any crypto wallet | Centralized Development: MetaMask is developed by Consensys, a private company, meaning product decisions, fee structures, and privacy policies are ultimately determined by a single entity |
| Fiat On-Ramp: Integrated partnerships with providers such as MoonPay and Transak allow users to buy crypto directly within MetaMask using credit cards or bank transfers | Rising User Frustration Over Fees: Some users have publicly pushed back on the size of swap service fees relative to trade value, particularly on smaller trades, prompting some to switch to direct DEX access or competing wallets |
Risk Management
Using MetaMask securely requires understanding and mitigating several categories of risk that come with self-custody.
Seed Phrase Security (Critical):
- Write the 12-word Secret Recovery Phrase on physical paper or metal (Cryptosteel, Billfodl) and store it in a secure location (safe, safety deposit box)
- Never store the seed phrase digitally: not in screenshots, notes apps, cloud storage, email drafts, or password managers
- Never enter your seed phrase on any website. MetaMask will never ask for it through a website or email. Any request for your seed phrase is a phishing scam
- Consider splitting the seed phrase across multiple physical locations for redundancy without single-point compromise
Transaction Safety:
- Always verify transaction details in the MetaMask confirmation popup before signing: check the recipient address, token amounts, and gas fees
- Use MetaMask’s transaction simulation feature to preview the outcome of complex DeFi transactions
- Be extremely cautious with token approvals. Unlimited approvals allow smart contracts to spend all of a token type from your wallet. Revoke unnecessary approvals using Revoke.cash or MetaMask’s built-in approval manager
- Enable MetaMask’s phishing detection and keep the extension updated to the latest version
Operational Security:
- Use a dedicated browser profile for crypto activities to isolate MetaMask from other browser extensions
- Consider using a hardware wallet (Ledger, Trezor) connected through MetaMask for large holdings
- Verify URLs manually when visiting DeFi sites: bookmark trusted sites and never click links from emails, DMs, or social media
- Be suspicious of any unsolicited tokens appearing in your wallet (airdrop scam tokens often contain malicious contract interactions)
- Use separate MetaMask wallets for different risk levels: a “hot” wallet for daily DeFi interaction and a “cold” or hardware-backed wallet for long-term storage
Network and RPC Risks:
- MetaMask’s default Infura RPC has historically paired IP addresses with wallet addresses. For improved privacy, configure alternative RPC providers (Alchemy, your own node, or privacy-preserving services)
- When adding custom networks, verify the RPC URL and chain ID against official documentation to avoid connecting to malicious or spoofed chains
- Be cautious with unfamiliar chain-switch requests from dApps. Verify the network details before approving
Cultural Relevance
MetaMask has become one of the most recognizable brands in the Web3 ecosystem, with its orange fox logo serving as a widely recognized symbol for self-custody and dApp access. The phrase “connect your MetaMask” has become common shorthand for connecting a crypto wallet more broadly, similar to how “Google it” is often used to mean searching the internet regardless of the search engine used.
The wallet played a key role in several major crypto trends since 2017. During the ICO boom, MetaMask was a tool that enabled retail participation in token sales. During DeFi Summer 2020, it was a gateway to yield farming. During the 2021 NFT boom, it was how many users bought their first digital art on OpenSea. Each wave of crypto adoption brought new MetaMask users, cementing its position as a common entry point to Ethereum and, increasingly, other chains.
MetaMask’s significance extends beyond functionality into the broader debate about digital self-sovereignty. The wallet is a tangible product implementing the “be your own bank” ethos common in crypto. When FTX collapsed in November 2022, the contrast between custodial exchange accounts (frozen, potentially lost) and MetaMask’s self-custody model (user-controlled, unaffected) was frequently cited as demonstrating why self-custody matters to some users.
The 2022 Infura privacy controversy (IP address collection paired with wallet addresses) highlighted the tension between MetaMask’s decentralization narrative and its reliance on Consensys-operated infrastructure. The incident sparked broader discussions about RPC centralization and user privacy in Web3.
For developers, MetaMask’s window.ethereum provider approach helped shape how many Web3 applications are built. The EIP-1193 provider specification that MetaMask helped popularize influenced the design of competing wallets such as Rabby and Coinbase Wallet.
Real-World Examples
DeFi Participation via MetaMask
Scenario: A user wants to earn yield on their ETH holdings using Aave, a decentralized lending protocol.
Implementation: The user opens Aave in their browser, clicks “Connect Wallet,” and selects MetaMask. MetaMask prompts the user to approve the connection. The user then selects “Supply ETH,” enters an amount, and MetaMask displays a transaction confirmation popup showing the gas fee and contract interaction. Upon approval, the ETH is deposited into Aave’s lending pool.
Outcome: The user earns variable interest on their deposited ETH while retaining full custody through MetaMask. The process requires no account creation, no KYC, and no bank, just a MetaMask wallet holding ETH.
NFT Minting on OpenSea
Scenario: A digital artist wants to create and sell an NFT collection on Ethereum without intermediaries.
Implementation: The artist connects MetaMask to OpenSea, creates a collection, uploads artwork, and sets royalty parameters. When a buyer purchases the NFT, MetaMask handles transaction signing on both sides: the buyer’s MetaMask signs the purchase transaction, and the artist receives ETH directly to their MetaMask wallet.
Outcome: The artist earns revenue from primary sales and ongoing royalties without gallery commissions or payment processor fees. All earnings go directly to their MetaMask address.
Multi-Chain Portfolio Management
Scenario: A crypto-active user holds assets across Ethereum mainnet, Polygon, Arbitrum, and Base, and needs to manage positions across all networks.
Implementation: The user adds each network to MetaMask (many can be added with one click directly from chain-specific dApps). MetaMask Portfolio provides a unified dashboard showing token balances, NFTs, and DeFi positions across connected chains. The user can switch networks with a single click to interact with chain-specific dApps.
Outcome: A single MetaMask installation manages the user’s EVM portfolio across multiple chains, with the same seed phrase and address structure working consistently across networks.
Hardware Wallet Security with dApp Access
Scenario: An investor holding significant crypto assets wants the security of cold storage while maintaining the ability to interact with DeFi protocols.
Implementation: The user connects a Ledger hardware wallet to MetaMask through USB or Bluetooth. MetaMask displays the Ledger-derived accounts alongside its regular accounts. When the user interacts with a dApp, MetaMask routes the transaction-signing request to the Ledger device, which displays transaction details on its secure screen and requires physical button confirmation.
Outcome: The user gets MetaMask’s dApp compatibility combined with Ledger’s hardware security. Private keys never leave the Ledger device, protecting against malware, browser exploits, and compromised computers while maintaining DeFi access.
Comparison Table
| Feature | MetaMask | Trust Wallet | Phantom | Rabby Wallet | Coinbase Wallet |
|---|---|---|---|---|---|
| Primary Ecosystem | EVM plus Bitcoin, Solana, Tron | Multi-chain (EVM + non-EVM) | Solana + EVM + Bitcoin | EVM-focused | EVM + Solana + Bitcoin |
| Platform | Browser extension + Mobile | Mobile + Browser extension | Browser extension + Mobile | Browser extension | Browser extension + Mobile |
| Custody Model | Non-custodial | Non-custodial | Non-custodial | Non-custodial | Non-custodial |
| Built-In Swaps | Yes (0.875% fee) | Yes (variable fee) | Yes (variable fee) | Yes (via aggregators) | Yes (variable fee) |
| Snaps/Plugins | Yes (MetaMask Snaps) | No | No | No | No |
| Transaction Simulation | Yes | Limited | Yes | Yes (pre-transaction security) | Limited |
| Hardware Wallet Support | Ledger, Trezor, Lattice1 | Limited | Ledger | Ledger, Trezor | Ledger |
| Monthly Active Users | ~30M | ~25M+ | ~10M+ | ~2M+ | ~10M+ |
| Best For | EVM/DeFi power users, expanding multi-chain use, development | Mobile-first multi-chain users | Solana-primary users | Security-conscious EVM users | Coinbase ecosystem users |
Related Terms
- Ethereum (ETH): The primary blockchain network that MetaMask was originally built to support, hosting one of the largest ecosystems of smart contracts and dApps
- EVM (Ethereum Virtual Machine): The runtime environment for smart contracts on Ethereum and compatible chains, defining the network standard MetaMask was originally designed around
- Private Key: The cryptographic key that controls ownership of blockchain assets, stored locally and encrypted within MetaMask
- Seed Phrase (Secret Recovery Phrase): The 12-word BIP-39 mnemonic that serves as the master backup for MetaMask’s Ethereum-based accounts and funds
- dApp (Decentralized Application): Blockchain-based applications that users interact with through MetaMask’s Web3 provider interface
- Gas Fee: The transaction fee paid to network validators, displayed and managed through MetaMask’s transaction confirmation interface
- Token Approval: A smart contract permission that allows a dApp to spend tokens from your wallet, managed through MetaMask’s approval interface
- Consensys: The blockchain software company founded by Joseph Lubin that develops and maintains MetaMask
- Infura: Consensys-operated Ethereum node infrastructure service that serves as MetaMask’s default RPC provider
- Hardware Wallet: A physical device storing private keys offline, connectable through MetaMask for enhanced security
- Web3: The vision of a decentralized internet built on blockchain technology, for which MetaMask serves as a primary user-facing gateway
- EIP-1193: The Ethereum Improvement Proposal that standardizes the JavaScript provider API MetaMask helped popularize
FAQ
Q: What is MetaMask and do I need it for crypto? MetaMask is a free, non-custodial cryptocurrency wallet that lets you store digital assets and interact with decentralized applications (dApps) on Ethereum, other EVM-compatible blockchains, and a growing set of non-EVM networks. You need MetaMask (or a similar wallet) to participate in DeFi, buy NFTs, or use most Web3 applications. If you only buy and hold crypto on centralized exchanges like Coinbase, you do not strictly need MetaMask, but it is generally necessary for accessing the decentralized ecosystem directly.
Q: Is MetaMask safe to use? MetaMask itself is a widely used wallet with a long-standing security architecture. Your private keys are encrypted locally on your device and never sent to MetaMask’s servers. However, security ultimately depends on user behavior. The primary risks are phishing attacks (fake websites asking for your seed phrase), malicious token approvals, and loss of the seed phrase. Using a hardware wallet with MetaMask can meaningfully improve security for large holdings.
Q: What happens if I lose my MetaMask seed phrase? If you lose your 12-word Secret Recovery Phrase and also lose access to your device (or uninstall MetaMask), your funds are permanently and irreversibly lost. No one, not MetaMask, not Consensys, not Ethereum developers, can recover them. This is the fundamental trade-off of self-custody: complete control means complete responsibility. Always store your seed phrase securely in a physical location.
Q: Does MetaMask work with Bitcoin or Solana? Yes. MetaMask has added native support for Bitcoin and Solana, alongside Tron, in addition to its original EVM-only chain support. MetaMask Snaps (third-party plugins) can extend support to further chains. For a Solana-native or Bitcoin-native experience, dedicated wallets such as Phantom (Solana) may still suit some users better, but MetaMask is no longer limited to EVM chains only.
Q: How much does MetaMask cost? MetaMask is free to download and use. There is no subscription fee. However, MetaMask charges a 0.875% service fee on swaps made through MetaMask Swaps, and fiat on-ramp purchases include partner fees. All blockchain transactions also require gas fees paid to network validators, which are a network cost rather than a MetaMask fee.
Q: How do I add a new blockchain network to MetaMask? Many dApps automatically prompt MetaMask to add their network (for example, clicking “Add Polygon” on a Polygon dApp). You can also add EVM networks manually in Settings, then Networks, then Add Network, entering the RPC URL, Chain ID, currency symbol, and block explorer URL. Verified networks like Polygon, Arbitrum, and Optimism appear in MetaMask’s built-in network list for one-click addition.
Q: What is the difference between MetaMask and a centralized exchange wallet? On a centralized exchange (Coinbase, Binance), the exchange holds your private keys and controls your funds. This is convenient but means you are trusting the exchange with your assets, as FTX users learned in 2022. MetaMask is non-custodial: you hold your own keys and have full control. The trade-off is that you are responsible for your own security, including protecting your seed phrase and verifying transactions.
Sources
- MetaMask Official Documentation: https://docs.metamask.io/
- MetaMask Support Center: https://support.metamask.io/
- Consensys Official Site: https://consensys.io/
- MetaMask Snaps Directory: https://snaps.metamask.io/
- Ethereum.org Wallets Guide: https://ethereum.org/en/wallets/
- EIP-1193 Provider Standard: https://eips.ethereum.org/EIPS/eip-1193
- MetaMask Portfolio: https://portfolio.metamask.io/
- MetaMask, Wikipedia: https://en.wikipedia.org/wiki/MetaMask
