[Bug] sdk.wallet.getEthereumProvider() hangs indefinitely in Base App WebView after April 2026 update

[zakaziko86]

Description

Base App's April 2026 update changed mini-app launch behavior from a
Farcaster mini-app host to a standard WebView. This causes
sdk.wallet.getEthereumProvider() to hang indefinitely — no error,
no timeout, no rejection.

Root Cause

sdk.isInMiniApp() returns false in Base App WebView since the
Farcaster host is not present. Any code that calls
sdk.wallet.getEthereumProvider() without checking this first will
hang forever.

Impact

• Any mini-app relying on the Farcaster SDK for wallet access is
  silently broken when opened via Base App
• No console error, no rejection — just an indefinite loading state
• Affects all developers who built mini-apps before April 2026

Suggested Fix

Detect Base App WebView using sdk.isInMiniApp() and fall back to
injected EIP-1193 provider:

const isInMiniApp = await sdk.isInMiniApp();
const provider = isInMiniApp 
  ? await sdk.wallet.getEthereumProvider()
  : window.ethereum ?? window.coinbaseWalletExtension;

References

• Related PR: docs: add wallet provider migration guide for Base App WebView (2026) #1433
• Related issue in farcasterxyz/miniapps: [Bug] sdk.actions.ready() and getEthereumProvider() hang indefinitely in Base App in-app browser (post-April 2026) farcasterxyz/miniapps#608