Provider

The Cosmostation browser extension supports multiple blockchains and exposes chain-specific providers for dApp integration.

For Ethereum-compatible chains, Cosmostation provides:

• EIP-6963 (opens in a new tab) compliant multi-wallet discovery
• A helper SDK via @cosmostation/extension-client
• A direct injected provider (window.cosmostation.ethereum)

This allows Cosmostation to integrate cleanly with both modern Ethereum dApps and existing provider-based flows.

EIP-6963 (Multi-Wallet Discovery)

Cosmostation fully supports EIP-6963, the Ethereum wallet discovery standard designed to allow multiple wallets to coexist without conflicts.

This is the recommended integration entry point for Ethereum dApps.

What is EIP-6963?

EIP-6963 introduces an event-based discovery mechanism:

• Wallets announce themselves explicitly
• dApps listen and build a wallet list
• No global provider overrides are required
• Multiple wallets can coexist safely

Cosmostation announces itself as an EIP-1193 compatible provider.

Discovering Cosmostation via EIP-6963

window.addEventListener('eip6963:announceProvider', (event) => {
  const { info, provider } = event.detail;
 
  if (info.rdns === 'io.cosmostation') {
    console.log('Cosmostation provider detected', provider);
  }
});

Provider Characteristics

• Fully EIP-1193 compatible
• Safe to use alongside other Ethereum wallets
• Well-suited for wallet selection UIs and production dApps

Using @cosmostation/extension-client

If you prefer not to manage EIP-6963 discovery manually, Cosmostation provides a lightweight helper SDK.

import { ethereum, InstallError } from '@cosmostation/extension-client';
 
try {
  const provider = await ethereum();
  // provider is an EIP-1193 compatible Ethereum provider
} catch (e) {
  if (e instanceof InstallError) {
    console.log('Cosmostation extension is not installed');
  }
}

Behavior

• Resolves the Cosmostation Ethereum provider
• Handles extension installation checks
• Returns an EIP-1193 provider
• Throws InstallError if the extension is not installed

This approach is useful when:

• You want a simple integration path
• You are building specifically for Cosmostation users
• You do not need to manage multiple wallet announcements directly

Vanilla JavaScript Integration

You can also access the provider directly from the injected global object.

const ethereum = () => {
  if ('cosmostation' in window) {
    return window.cosmostation.ethereum;
  } else {
    window.open('https://cosmostation.io/wallet/#extension');
    /**
     * or:
     * window.open(
     *   "https://chrome.google.com/webstore/detail/cosmostation/fpkhgmpbidmiogeglndfbkegfdlnajnf"
     * );
     */
  }
};
 
const provider = ethereum();

Notes

• The provider is available when the extension is installed
• The API follows EIP-1193