Worldcoin App with 1.7 million users, which Crypto applications are integrated?

Question

> World App takes advantage of Ethereum's composability, piggybacking on multiple protocols and APIs.**Original title: "****COMPOSABILITY ON WORLD APP: The protocols powering Worldcoin's first wallet****"****Written by: Worldcoin****Compile: Kxp**A global identity and financial tool like the World App typically takes decades to build and thousands of people to maintain, but with Ethereum composability it can become a reality today.How is this possible? Worldcoin is committed to incorporating open protocols and APIs into this seamless and easy-to-use application. While its ecosystem is still evolving, we can start by looking at the protocol currently used by World App, which provides private digital identities and a new type of financial system for people around the world.## WalletConnect: Application InteractionThe World App allows people to hold and use a World ID, a unique proof of person (PoP) that acts as an online digital passport. People can connect their World App with applications and prove their human identity in a privacy-preserving way. This interaction is enabled through WalletConnect, a communication protocol for Web3 that securely connects and interacts with over 600 wallets and applications.Click here to learn more about WalletConnect.## Uniswap: Buy and Sell CryptoThe goal of the World App is to make Crypto accessible to everyone, including those who are new to Crypto. That's why the app allows people to easily buy and sell cryptocurrencies like Bitcoin or Ethereum, while abstracting technical details that can be somewhat intimidating to new users.Token transactions can be conducted through the Uniswap protocol, which provides DeFi Crypto transactions. Among other features, this enables people to exchange one Crypto for another without a trusted intermediary. As of now, more than $1.4 trillion has been traded on Uniswap. Now, people can already use Uniswap on the World App to process transactions such as between digital dollars and Bitcoin or Ethereum.Click here to learn more about the Uniswap protocol.## Safe: walletEvery World App user receives an Ethereum wallet with a smart contract deployed on-chain. The World App uses smart contract wallets and account abstraction to improve the overall security of the wallet, allowing granular management and, in the near future, account recovery. In addition, smart contract wallets also allow subsidization of gas fees, so that users do not have to pay gas fees for blockchain transactions. The wallet is self-custodial, meaning only its owner has control over it.Essentially, this smart contract wallet uses Safe{Core}, an account abstraction stack provided by Safe. Safe is a decentralized hosting protocol that has become the security standard for Web3. At present, more than 600 billion US dollars of funds are stored in the Safe account. The agreement is decentralized, open source, and has undergone multiple audits.World App is by far the largest Safe Wallet deployer on the Polygon blockchain, stats can be viewed here.Click here to learn more about Safe.## Polygon: BlockchainA beta version of the World App has been deployed and is live on Polygon. Polygon can achieve scalability and lower transaction costs, which may not be feasible on the Ethereum main chain, but it still takes advantage of the security features of the Ethereum main chain.Click here to learn more about Polygon.## Optimism: BlockchainAs the World App expands further, the World App will be able to run its own Rollup thanks to the work of the Ethereum Improvement Proposal 4844 (EIP-4844) community. This means World App transactions will run on its own chain while still relying on the security provided by Ethereum.To prepare for the above, the World App will be launched on Optimism's OP Mainnet, a Layer 2 Rollup that enjoys the security of Ethereum while reducing costs and latency. You can learn more about Worldcoin's vision for Hyperchain in this blog post.Click here to learn more about Optimism.## MoonPay and Ramp: deposits and withdrawalsDepositing and withdrawing funds to the World App Wallet allows people to easily build Crypto portfolios and savings. It also allows people to withdraw Crypto assets into regular currency (or fiat currency) through bank accounts, credit cards, or debit cards. In the World App, the two partners that enable this functionality are Ramp and MoonPay, which have operations in more than 160 countries around the world.MoonPay is a leading Web3 infrastructure company providing end-to-end solutions for payments, hosting, design and minting. MoonPay is trusted by hundreds of partners, including leading wallets, exchanges and merchant brands.Ramp is a fintech company that provides a non-custodial full payment infrastructure designed to reduce transaction friction and friction for hundreds of partners and millions of users.Learn more about Ramp here and MoonPay here.## ENS: transferOne of the biggest benefits of Crypto is its ability to enable low-cost and near-instant transfers of funds around the world, which is especially beneficial for international transfers that often come with high fees. With the Ethereum Name Service (ENS), people can easily send funds to friends and family by using names that are easy to remember and identify, rather than lengthy wallet addresses or bank accounts. ENS makes it easier to have a profile in the crypto space similar to what is currently used on social media.World App's peer-to-peer payments support ENS usernames for easier ERC-20 transfers.Click here to learn more about ENS.## Circle: Digital DollarHolding digital dollars (and other stablecoins in the future) is a core function of the World App. Users can deposit and withdraw digital dollars (also known as USDC), and then use those digital dollars to buy Crypto. In the World App, people can always get digital dollars through Circle.Circle will be regulated as a licensed money transmitter under U.S. state regulations. USDC is always converted 1:1 to USD, and its reserves are hosted and managed by leading US financial institutions such as BlackRock and BNY Mellon.Click here to learn more about Circle.## Alchemy: Cross-chain communicationBlockchain is a decentralized information ledger. To interface with it, World App uses Alchemy, a Web3 development platform that provides powerful tools to easily build and scale dapps, and handle over $100 billion in transactions. All Crypto transactions for the World App will be sent to Alchemy for on-chain processing.Click here to learn more about Alchemy.