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Detecting Pelagus


Similar to other browser extension wallets, Pelagus Wallet injects a unique window.ethereum object into the browser. This object can be used to send messages to the wallet, get data from the provider, and handle user actions.

Handling Multiple Extensions

Often times, users have multiple browser extension wallets installed alongside Pelagus, each with their own injected ethereum object. The injection of multiple wallet providers in one browsers can potentially cause collisions or overrides of the Pelagus window.ethereum object. To avoid this, it is important to specifically detect the presence of the Pelagus extension in your application.

The Default Wallet

Pelagus wallet has an option for users to set it as the default wallet. If Pelagus is:

  • Set as the default wallet: Pelagus will override the ethereum object of all other injected wallet providers.
  • Not set as the default wallet: Pelagus may be overridden by the ethereum object of another wallet provider.

For easy handling of either of the above cases, Pelagus provides a property isPelagus in the window.ethereum object. You can search for the isPelagus property using the following code:

window.ethereum.providers?.find((p) => p.isPelagus) || window.ethereum;

The above expression will evaluate to the Pelagus provider if it is present.

Pelagus in Browser

Pelagus can be detected by searching for a provider with the isPelagus property in the window.ethereum object.

Running the command from above in your browser console will return the Pelagus provider if it is present:

> window.ethereum.providers?.find((p) => p.isPelagus) || window.ethereum

// Pelagus is present output
TallyWindowProvider {_events: {}, _eventsCount: 0, _maxListeners: undefined, chainId: '0x1', connected: false, …}

If the value returned is not a TallyWindowProvider, then Pelagus is not present in the browser.

Pelagus in Your Application

Inside of your application, you may want to differentiate between Pelagus and other Quai-based wallets. Verify that the provider is Pelagus by checking the isPelagus property in the window.ethereum object:

function detectPelagus() {
if (window.ethereum) {
const provider = window.ethereum.providers?.find((p) => p.isPelagus);
if (provider.isPelagus) {
// Pelagus detected in the application
} else {
// Another wallet provider detected
} else {
// No wallet provider detected