Provider API for Cosmos: Connecting Browser Extension Wallets and Integrating Web3 Wallets

What Is the Injected Provider API?

The Injected Providers API is a JavaScript API injected by OKX into websites visited by users. Your decentralized application (DApp) can utilize this API to:

• Request user account access.
• Read data from blockchains connected by the user.
• Facilitate message and transaction signing.

Note: Cosmos integration is currently supported only via the OKX Web3 Wallet browser extension.

Connecting Accounts

window.okxwallet.keplr.enable(chainIds)

Description

This method:

• Requests plugin unlock if currently locked.
• Seeks user permission for webpage access to Keplr if not previously granted.
• Accepts single or multiple chain IDs as an array.

Behavior:

• Grants permissions for all unauthorized chains simultaneously if multiple IDs are provided.
• Throws an error if the user cancels unlocking or denies permission.

Example:

try {
  await window.okxwallet.keplr.enable(['cosmoshub-4']);
  console.log('Account access granted');
} catch (error) {
  console.error('Permission denied:', error);
}

Signing Transactions

window.okxwallet.keplr.signAmino(chainId, signer, signDoc)

Description

Signs transactions in a standardized Amino format, akin to CosmJS's OfflineSigner.signAmino.

Parameters:

• chainId: Target blockchain identifier.
• signer: Account address.
• signDoc: Structured signing document.

Example:

const signedTx = await window.okxwallet.keplr.signAmino(
  'cosmoshub-4',
  'cosmos1...',
  {
    chain_id: 'cosmoshub-4',
    account_number: '123',
    // Additional signDoc fields...
  }
);

Signing Messages

window.okxwallet.keplr.signArbitrary(chainId, signer, data)

Description

Signs arbitrary data (equivalent to signMessage(any) in other chains).

Example:

const signature = await window.okxwallet.keplr.signArbitrary(
  'cosmoshub-4',
  'cosmos1...',
  'Custom message'
);

Events

Successful Connection

Triggered when users accept connection requests via window.okxwallet.keplr.enable(chainId).

Usage:

window.addEventListener('keplr_connect', (event) => {
  console.log('Wallet connected:', event.detail);
});

FAQ

1. How do I handle user rejection during connection?

Catch errors from enable() and prompt users to retry or check wallet permissions.

2. Can I use this API with mobile wallets?

Currently, only the OKX Web3 Wallet browser extension supports Cosmos integration.

3. What’s the difference between signAmino and signArbitrary?

• signAmino follows Cosmos SDK’s Amino format for transactions.
• signArbitrary signs unstructured data (e.g., messages).

👉 Explore OKX Web3 Wallet integration

4. Are there rate limits for API calls?

No enforced limits, but design your DApp to handle user-driven delays.

5. How do I verify message signatures?

Use public keys from getKey(chainId) and Cosmos SDK’s cryptographic utilities.

👉 Learn more about Cosmos SDK

Pro Tip: For optimal UX, combine enable() with event listeners to dynamically update your DApp’s state upon wallet connection changes.

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