# X Layer RPC Node  
OKX's zkEVM Layer 2

Connect to X Layer, OKX's zkEVM Layer 2 built on Polygon CDK. Experience ultra-low fees, seamless OKX Wallet integration, and growing ecosystem backed by a leading exchange.

[Documentation](https://docs-rpc.crypto-chief.com/chains/x-layer) [Get a free endpoint ](https://auth.crypto-chief.com/registration)

##### 3 M+

Requests per Day

##### 99.9 %

Network Uptime

##### < 100 ms

Average Response Time

##### 24/7

Technical Support

## Specification X Layer Network

Technical characteristics and available endpoints

![X Layer (OKB)](/img/protocols/xlayer.svg)

### X Layer (OKB)

Mainnet & Testnet Support

Chain ID 196

Protocol HTTPS / WSS

Uptime 99.9%

Block Time \~2s

Consensus zkEVM (Polygon CDK)

EVM Compatible Yes

X Layer is OKX's Layer 2 scaling solution built using Polygon's Chain Development Kit (CDK) with zkEVM technology. Backed by one of the world's largest cryptocurrency exchanges, X Layer offers low-cost transactions, native OKX Wallet integration, and seamless access to OKX's massive user base and liquidity.

#### Key capabilities:

- Built on Polygon CDK with zkEVM security
- Direct integration with OKX exchange and OKX Wallet
- Transaction fees significantly lower than Ethereum
- Access to OKX's 50M+ users and deep liquidity
- Full EVM compatibility with Ethereum tooling
- Growing DeFi ecosystem with exchange-backed projects
- Fast finality with 2-second block time

#### 🔗 RPC Endpoints

HTTPS

`https://rpc.crypto-chief.com/xlayer/{YOUR_API_KEY}`

WSS

`wss://rpc.crypto-chief.com/xlayer/ws/{YOUR_API_KEY}`

Replace {YOUR\_API\_KEY} with your actual API key from the dashboard.

## What is an X Layer RPC Node?

Access OKX's zkEVM ecosystem

An X Layer RPC node provides applications with access to OKX's Layer 2 network, enabling low-cost Ethereum-compatible transactions with direct integration to OKX exchange infrastructure. Built on Polygon CDK with zkEVM technology, X Layer combines scalability with the trust and liquidity of a major centralized exchange.

### Why X Layer matters

X Layer brings together the best of both worlds — decentralized Layer 2 technology with centralized exchange resources. Backed by OKX, one of the world's largest crypto exchanges, X Layer offers unique advantages including native wallet integration, direct fiat onramps, and potential access to millions of existing OKX users.

**X Layer advantages:**

- **Exchange integration** — direct connection to OKX platform and liquidity
- **zkEVM security** — Polygon CDK with zero-knowledge proofs
- **Low fees** — significantly cheaper than Ethereum mainnet
- **OKX Wallet support** — native integration with OKX's wallet
- **User base access** — tap into OKX's 50M+ users
- **EVM compatible** — deploy Ethereum contracts unchanged

### X Layer architecture

X Layer is built using Polygon's Chain Development Kit (CDK), a modular framework for creating zkEVM-powered Layer 2 chains. This technology stack provides zero-knowledge proof security while maintaining full EVM equivalence, giving developers familiar Ethereum tooling with Layer 2 performance.

**How it works:**

1. Transactions submitted to X Layer sequencer
2. Batched execution on Layer 2 with 2s blocks
3. Zero-knowledge proofs generated for validity
4. Proofs and data posted to Ethereum L1
5. Cryptographic finality once verified on-chain

### RPC access

**HTTPS endpoints** handle standard operations — balance queries, transaction submission, contract calls, and state reads with reliable performance.

**WebSocket endpoints** enable real-time updates for blocks, transactions, events, and logs — essential for trading interfaces and exchange integrations.

## Technical Documentation

Quick start for developers

### Supported RPC Methods

X Layer supports all standard Ethereum JSON-RPC methods:

- **eth\_blockNumber** — current block number
- **eth\_getBalance** — token balances
- **eth\_call** — contract view functions
- **eth\_sendRawTransaction** — submit transactions
- **eth\_getTransactionReceipt** — transaction status
- **eth\_getLogs** — event logs
- **eth\_gasPrice** — current gas price
- **eth\_estimateGas** — gas estimation
- **eth\_subscribe** — WebSocket subscriptions

### Code Examples

💻

#### JavaScript (ethers.js) — X Layer Connection:

```
const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://rpc.crypto-chief.com/xlayer/YOUR_API_KEY');

// Verify network
const network = await provider.getNetwork();
console.log('Chain ID:', network.chainId); // 196

// Get balance
const balance = await provider.getBalance('0x...');
console.log('Balance:', ethers.formatEther(balance));

// Send transaction
const wallet = new ethers.Wallet('YOUR_PRIVATE_KEY', provider);
const tx = await wallet.sendTransaction({
  to: '0x...',
  value: ethers.parseEther('0.1')
});
console.log('TX:', tx.hash);
await tx.wait();
```

💻

#### Python (web3.py) — X Layer Setup:

```
from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://rpc.crypto-chief.com/xlayer/YOUR_API_KEY'))

print('Connected:', w3.is_connected())
print('Chain ID:', w3.eth.chain_id)  # 196
print('Block:', w3.eth.block_number)
print('Gas price:', w3.eth.gas_price)
```

💻

#### WebSocket — Real-Time Updates:

```
const { ethers } = require('ethers');
const provider = new ethers.WebSocketProvider('wss://rpc.crypto-chief.com/xlayer/ws/YOUR_API_KEY');

// Monitor blocks
provider.on('block', (blockNumber) => {
  console.log('New block:', blockNumber);
});

// Monitor events
const filter = {
  address: '0x...',
  topics: [ethers.id('Transfer(address,address,uint256)')]
};

provider.on(filter, (log) => {
  console.log('Event:', log);
});
```

### Best Practices

- **OKX Integration:** Leverage OKX Wallet for seamless user onboarding
- **Gas Optimization:** Optimize contracts even with low fees
- **Bridge Usage:** Use official X Layer bridge for asset transfers
- **EVM Compatibility:** Deploy Ethereum contracts without changes
- **Testing:** Use testnet before mainnet deployment
- **Monitoring:** Implement proper error handling and retry logic

## Why choose us?

Reliable infrastructure for X Layer applications

### Fast Performance

Optimized infrastructure delivering &lt;95ms latency with efficient routing and caching for OKX-integrated applications.

### zkEVM Security

Benefit from Polygon CDK's zero-knowledge proof security with enterprise-grade infrastructure reliability.

### Usage Analytics

Monitor RPC metrics including request volume, method distribution, latency, and error rates through dashboard.

### Global Access

Nodes deployed globally ensuring low latency for OKX's international user base across all regions.

### Auto-Scaling

Infrastructure scales automatically during high traffic maintaining consistent performance.

### Technical Support

24/7 support from engineers familiar with X Layer, Polygon CDK, and exchange integrations.

## Examples of Use

Build on OKX's Layer 2 ecosystem

X Layer's combination of exchange backing, zkEVM security, and low fees makes it ideal for DeFi applications, trading platforms, and Web3 projects targeting OKX's massive user base.

#### Exchange-Integrated DeFi

Build DeFi protocols with direct OKX integration. Leverage exchange liquidity, fiat onramps, and seamless user onboarding from OKX's 50M+ users.

#### Trading Platforms

Create DEXs and trading interfaces with OKX Wallet integration. Our infrastructure supports high-frequency trading and real-time price feeds.

#### Wallet Applications

Integrate X Layer into multi-chain wallets with native OKX Wallet support for smooth user experience and asset management.

#### DeFi Protocols

Launch lending, staking, and yield platforms benefiting from X Layer's low fees and growing ecosystem backed by OKX.

#### NFT Marketplaces

Build NFT platforms with low minting costs and OKX marketplace integration for broader distribution and liquidity.

#### GameFi & Social

Create blockchain games and social apps leveraging low fees and OKX's user base for rapid user acquisition.

## Got questions?  
we are here to help

## What is X Layer? 

X Layer is OKX's Layer 2 scaling solution built using Polygon CDK with zkEVM technology. It offers low-cost transactions with native OKX exchange integration.

## Who built X Layer? 

X Layer was built by OKX, one of the world's largest cryptocurrency exchanges, using Polygon's Chain Development Kit (CDK) technology stack.

## Is X Layer a zkEVM? 

Yes, X Layer uses Polygon CDK which implements zkEVM technology with zero-knowledge proofs for transaction validity and security.

## How much do X Layer transactions cost? 

X Layer transaction fees are significantly lower than Ethereum mainnet, typically costing a fraction of mainnet gas fees.

## Can I use OKX Wallet with X Layer? 

Yes, X Layer has native OKX Wallet integration making it easy to connect and transact directly from OKX's wallet application.

## Is X Layer EVM compatible? 

Yes, X Layer is fully EVM-compatible. Deploy Ethereum smart contracts without changes using standard Ethereum development tools.

## How do I bridge assets to X Layer? 

Use the official X Layer bridge or bridge directly through OKX Wallet. Assets can be deposited from Ethereum or other supported chains.

## What is Polygon CDK? 

Polygon CDK (Chain Development Kit) is a modular framework for building custom zkEVM-powered Layer 2 chains with Ethereum security.

## Do you support X Layer testnet? 

Yes, we provide RPC access to both X Layer mainnet (196) and testnet for development and testing.

## How is X Layer different from Polygon zkEVM? 

Both use similar zkEVM technology, but X Layer is operated by OKX with native exchange integration, while Polygon zkEVM is run by Polygon Labs.

## Pricing that grows with your needs.

### Free

Start building on Web3 — no credit card.

##### $0

- 5 reqs/sec RPC
- 5 reqs/min Unified API
- 1 req/day AML
- Ultimate chains
- WSS, Statistics
- Community support

[Get started ](https://auth.crypto-chief.com/registration)

### Pay for use

Flexible pay-as-you-go for any workload.

##### From $10

- 400 reqs/sec RPC
- 300 reqs/min Unified API
- 5 reqs/sec AML
- EventStream
- Ultimate chains
- WSS, Whitelists, Statistics
- Support portal

[Get started](https://auth.crypto-chief.com/registration)

### Subscription

From $500 monthly plus 20% extra value.

##### From $500

- 400 reqs/sec RPC
- 300 reqs/min Unified API
- 5 reqs/sec AML
- EventStream
- Ultimate chains
- WSS, Whitelists, Statistics
- Support portal

[Get started ](https://auth.crypto-chief.com/registration)

### Enterprise

Tailored solution for expert builders

##### Custom terms

All Subscription features plus:

- Flexible rate limits
- Engineering team support
- Custom SLA
- Personal manager

[Contact Sales ](/contact/)