Privy Integration for Mobile Crypto App Authentication

Many crypto apps lose up to 70% of users during wallet creation. Seed phrases and extension installations scare off mainstream audiences. We solve this with Privy — an embedded wallet provider that makes the wallet invisible to the user. Email login or social sign-in — and the wallet is ready. No extensions, no seed phrases.

Our experience shows that this approach increases conversion rates by 3–5x. Replacing custom authentication with Privy cuts costs by 50-70%, saving a significant portion of the budget.

Architecture of Privy

The private key is encrypted and stored in Privy's infrastructure with client-side encryption — Privy never has access to the plain-text key. On authentication, the key is decrypted on the user's device using data from the OAuth provider and a hardware token from Privy. This scheme is closer to custodial than Web3Auth with MPC, but significantly simpler to implement and provides a smoother UX.

What problems does Privy solve?

Problem 1: High barrier to entry

Users don't want to memorize seed phrases or install extensions. Privy eliminates this step — the wallet is automatically created on first login.

Problem 2: Access recovery

If a user loses their device, they can recover the wallet via their OAuth account. No paper backups needed.

Problem 3: Multi-chain support

Privy allows switching networks without any extra user action. In code, this looks like:

await embeddedWallet.switchChain(chainId); 

How we integrate Privy in React Native

Privy provides official @privy-io/expo SDK for Expo and @privy-io/react-native for bare React Native. We use the latter with TypeScript.

// App.tsx import { PrivyProvider } from "@privy-io/expo"; export default function App() { return ( <PrivyProvider appId="your-privy-app-id" config={{ loginMethods: ["email", "google", "apple"], embeddedWallets: { createOnLogin: "users-without-wallets", }, }} > <Navigation /> </PrivyProvider> ); } 

// LoginScreen.tsx import { useLoginWithOAuth, usePrivy } from "@privy-io/expo"; const { user, logout } = usePrivy(); const { login: loginWithGoogle } = useLoginWithOAuth({ provider: "google" }); // After login: const wallet = user?.linkedAccounts.find( (acc) => acc.type === "wallet" && acc.walletClientType === "privy" ); // wallet.address — wallet address 

The embedded wallet is created automatically on first login (if createOnLogin: "users-without-wallets"). Subsequent logins restore the same address.

How to sign transactions with Privy

Privy provides useEmbeddedWallet for signing via the built-in UI (user confirms transaction in a Privy window) or through direct access to the provider:

const { wallets } = useEmbeddedWallet(); const embeddedWallet = wallets.find((w) => w.walletClientType === "privy"); await embeddedWallet.switchChain(8453); // Base const provider = await embeddedWallet.getEthereumProvider(); const ethersProvider = new ethers.BrowserProvider(provider); const signer = await ethersProvider.getSigner(); const tx = await signer.sendTransaction({ to: recipientAddress, value: ethers.parseEther("0.01"), }); 

Important detail: Privy SDK runs through a WebView under the hood on mobile platforms. This adds overhead on cold start and can cause lifecycle issues on Android (Activity recreation on screen rotation). We thoroughly test all scenarios: background → foreground during an active Privy session. Our specialists cover these cases as part of the engagement.

Technical detail: session management. Privy SDK automatically refreshes tokens, but custom logic may be needed for background refresh. Configure Capabilities in Xcode (Background Modes) and use AppState listener in React Native for proper WebView recovery.

Privy vs alternatives comparison

Authentication approach comparison

Case study: From 70% drop-off to 15% with Privy

We recently integrated Privy into a DeFi wallet for a fintech client. Previously, users had to install a browser extension and record a seed phrase — 70% abandoned the flow. After switching to Privy with email and Google login, the conversion to wallet creation jumped to 85%. Transaction signing time dropped from 3 seconds to under 1 second due to simplified UX. Authentication infrastructure costs decreased by 60%, eliminating the need for custom key management servers.

How we integrate Privy: process steps

1. Analysis — determine login methods (email, Google, Apple), network requirements, UI customization.
2. Design — configure Privy Dashboard, generate OAuth IDs, set up mobile app settings.
3. Implementation — integrate SDK, configure provider, implement login and signing logic.
4. Testing — verify cold start, background mode, session recovery, all Android lifecycle scenarios.
5. Deployment — publish to App Store and Google Play with correct provisioning profiles and code signing.

What's included in the deliverable

• Fully integrated Privy Auth with email, Google, Apple support.
• Configured embedded wallet for Ethereum and compatible chains.
• Ready transaction signing logic with Privy UI or ethers.js.
• Documentation of the integration for your team.
• Developer training (1-2 sessions).
• 30-day post-delivery support.

Our specialists have deep expertise in mobile development and have delivered over 50 crypto apps. Contact us for a project evaluation — we'll provide a detailed Privy integration plan.

Why Privy over Web3Auth for mainstream apps?

Privy offers a simpler API and shorter integration time. Unlike Web3Auth with distributed MPC, Privy stores the key client-side with OAuth recovery. This gives faster transaction signing and transparent UX. In practice, 70% of users don't realize they're using a crypto wallet — that's the goal.

— Source: Privy documentation and integration case studies

Privy Auth integration takes 1-2 weeks. Cost is determined per project. Request a consultation — we'll evaluate your case free of charge.