Provider API | Cosmos | Connect to Extension Wallet | Wallet Integration | DEX API Docs

Integrating a decentralized application (DApp) with a non-custodial wallet is essential for delivering a seamless and secure blockchain experience. The OKX Wallet extension provides robust support for Cosmos-based chains through its injected provider API, enabling developers to build powerful, user-friendly applications. This guide explores how to connect, authenticate, sign transactions and messages, and listen to real-time events using the OKX Wallet’s Keplr-compatible interface.

Whether you're building a decentralized exchange (DEX), staking platform, or cross-chain tool, understanding the injected provider API, wallet integration, and Cosmos chain interactions is crucial for optimal performance and security.

What Is the Injected Provider API?

The injected provider API refers to a JavaScript interface that OKX Wallet seamlessly injects into web pages when users visit DApps. This allows your application to interact directly with the user's wallet without requiring manual configuration.

Through this API, your DApp can:

• Request access to the user’s wallet accounts
• Read on-chain data from connected Cosmos networks
• Prompt users to sign transactions and arbitrary messages securely

This integration operates entirely client-side, ensuring private keys never leave the user’s device—maintaining full control and security.

✅ Note: Cosmos chain support is currently available exclusively through the OKX browser extension. Mobile app or other platforms may have limited functionality.

👉 Discover how easy it is to integrate wallet connectivity into your DApp today.

Connecting to OKX Wallet

To establish a connection between your DApp and OKX Wallet, use the following method:

await window.okxwallet.keplr.enable(chainIds);

How It Works

When called, this function triggers one of two actions:

1. If the wallet is locked, it prompts the user to unlock it.
2. If permissions haven't been granted yet, it requests authorization for the specified chains.

The chainIds parameter accepts either a single chain ID or an array of multiple chain IDs. This enables bulk permission requests across different Cosmos-based networks (e.g., cosmoshub-4, osmosis-1) in one call.

If the user denies access or fails to unlock the wallet, the promise rejects with an error. Always wrap this call in a try-catch block for graceful error handling.

Example Usage

try {
  await window.okxwallet.keplr.enable(['cosmoshub-4', 'osmosis-1']);
  console.log('Connected to OKX Wallet');
} catch (error) {
  console.error('User denied access:', error);
}

Once connected, your DApp can retrieve account details and begin interacting with the blockchain.

Signing Transactions

To submit operations like token transfers or governance votes, your DApp must request transaction signing from the user.

Use the following method:

const result = await window.okxwallet.keplr.signAmino(chainId, signer, signDoc);

Parameters Explained

• chainId: The target blockchain's identifier (e.g., cosmoshub-4)
• signer: The account address initiating the transaction

• signDoc: A structured object containing:

  • msgs: Array of messages (e.g., send, delegate)
  • fee: Transaction fee specification
  • chain_id: Must match the connected chain
  • account_number, sequence, memo: Required for proper signing

This format aligns with CosmJS’s OfflineSigner.signAmino() method, making migration or interoperability straightforward.

Response

The returned result includes:

• Signed transaction (signed)
• Signature bytes
• Transaction hash (after broadcast)

This ensures full visibility into the signing process while maintaining compatibility with existing tooling.

👉 See live examples of transaction signing in action — test it in your own environment now.

Signing Arbitrary Messages

For identity verification, login systems, or off-chain attestations, you may need to sign non-transactional data.

Use:

const signature = await window.okxwallet.keplr.signArbitrary(chainId, signer, data);

Use Cases

• Secure user authentication without passwords
• Proving ownership of an address
• Signing off-chain orders in DEX protocols

The data parameter can be any string or byte array. The wallet displays a hex-encoded version for user review before signing.

This mirrors the behavior of legacy sign-message functions used in earlier Cosmos SDK versions but with enhanced security and clarity.

Example: User Login with Signed Message

const message = "Login request at " + Date.now();
const signature = await window.okxwallet.keplr.signArbitrary(
  'cosmoshub-4',
  'cosmos1abc...', 
  new TextEncoder().encode(message)
);

// Send signature + message to backend for verification

Backend validation should reconstruct the original payload and verify the signature using public key cryptography.

Listening to Wallet Events

Real-time feedback improves user experience significantly. The OKX Wallet API supports event listeners that notify your DApp of critical state changes.

Supported Events

While direct connection/disconnection events aren't exposed, keystorechange effectively serves as a proxy for detecting session updates.

Implementation Example

window.addEventListener('keplr_keystorechange', () => {
  console.log('Wallet state changed');
  // Refresh account info or re-enable buttons
});

This lets your app dynamically respond to user actions—such as switching accounts or locking the wallet mid-session—without requiring page reloads.

Frequently Asked Questions (FAQ)

Q: Is Cosmos supported on all OKX Wallet platforms?

No. Currently, Cosmos chain integration is only available via the OKX browser extension. Support for mobile apps or embedded wallets may vary or require future updates.

Q: Can I connect multiple Cosmos chains at once?

Yes. You can pass an array of chain IDs to enable(), allowing users to authorize several networks in a single prompt. This streamlines onboarding for multi-chain DApps.

Q: What happens if a user rejects a signing request?

The API returns a rejected promise with an error object. Your application should handle this gracefully by informing the user and offering retry options.

Q: Does the injected API work with other wallets?

The methods follow Keplr’s naming convention and structure, so some interoperability exists. However, feature availability depends on individual wallet implementations.

Q: Are private keys ever exposed to my DApp?

Absolutely not. All cryptographic operations occur within the isolated environment of the OKX Wallet extension. Your app only receives signed outputs—not keys or sensitive inputs.

Q: How do I test my integration?

Use the provided CodePen examples linked in each section to experiment in a sandboxed environment. These demos simulate real-world usage patterns and help debug early-stage integrations.

Core Keywords

For optimal SEO visibility and discoverability among developers building on Cosmos, these keywords are naturally integrated throughout:

• Injected provider API
• Cosmos
• Connect to extension wallet
• Wallet integration
• DEX API docs
• Sign transactions
• Sign messages
• Keplr-compatible

These terms reflect high-intent search queries from blockchain developers seeking reliable documentation and implementation patterns.

👉 Start integrating with confidence — access developer tools and resources now.

By leveraging the OKX Wallet's injected provider API, developers gain a secure, efficient pathway to interact with Cosmos-based ecosystems. From connecting wallets to signing transactions and listening for events, every step is designed for usability without compromising security.

With clean syntax, strong compatibility with CosmJS standards, and real-time responsiveness, OKX Wallet empowers next-generation DApps on the Cosmos network.