Farcaster Devs

Feedback regarding detection of mini-app hosts:

• Option 1 (well-known query parameter) would be the worst because it’s another identifier apps need to hardcode and will be easily spoofed (akin to browser extension wallets setting `isMetaMask` to true on their `window.ethereum` object). Just continue to let apps specify custom params for themselves in `<meta name="fc:frame">` if they really need it.

• Option 2 (message passing) is ideal but can be improved further – I recommend turning it into a two-way message system modeled after EIP-6963 to avoid race conditions. (Also while you’re at it, use EIP-6963 to announce Farcaster Wallet’s EIP-1193 object to the app for instant compatibility with existing wallet picker UIs.)

• Option 3 (`isInMiniApp()` SDK function) – this is fine assuming apps don’t already have the SDK code-split from their main client-side bundle, but maybe redundant to Option 2.

Another benefit of the wurplet adopting EIP-6963 – apps can just leverage all the standardized RPC methods apps normally expect from a traditional wallet, like checking whether a given chain is supported or not.

Another benefit of the wurplet adopting EIP-6963 – apps can just leverage all the standardized RPC methods apps normally expect from a traditional wallet, like checking whether a given chain is supported or not.

https://github.com/farcasterxyz/miniapps/discussions/240#discussioncomment-13108720

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Exposing a list of chain IDs in the SDK wouldn’t hurt, but this can quickly become stale if apps don’t bump their SDK package version in a timely manner.

Have Warpcast announce Farcaster Wallet’s EIP-1193 object to the app using EIP-6963, then support the RPC methods `wallet_addEthereumChain` (EIP-3085) and `wallet_switchEthereumChain` (EIP-3326).

This lets apps “request” a particular chain, which Farcaster Wallet can accordingly accept or reject on the spot.

warplet supports 6963 and chain switching

it doesn’t support add since we wouldn’t easily be able to show you assets and activity from arbitrary chains

the main motivation for this is to allow clients to apply filtering and tagging to mini apps statically