EdgeX API: Documentation, Signatures and Integrations

Incubated by Amber Group, EdgeX Exchange uses a Layer-2 scaling solution built on StarkWare (StarkEx). Orders are matched in an off-chain engine at up to 200,000 transactions per second with 10 ms latency. Cryptographic proofs (ZK-proofs) are then published to Ethereum, delivering L1-grade security with near-zero gas fees.

API Security: Protecting the L1 and L2 Layers

Thanks to ultra-low fees (base ~0.012% maker / 0.038% taker) and USDT collateral, the EdgeX API is ideal for sophisticated algorithmic strategies:

• Market Making (HFT): Maintaining liquidity in the order book using WebSockets (the EdgeX engine processes orders faster than most DeFi protocols).
• Funding Rate Arbitrage: Delta-neutral strategies between EdgeX and centralized exchanges (Binance, Bybit).
• Liquidation hunting: Analyzing the feeds of the Stork oracle used on EdgeX to calculate Index and Mark Price, for automatic entries during cascading liquidations.

→ EdgeX on-chain statistics and metrics

On EdgeX, developer onboarding consists of 3 steps:

1. Connecting an L1 Wallet: Connect your wallet (e.g., MetaMask) in the EdgeX Exchange interface. Select the network (Ethereum or Arbitrum).
2. L2 Stark Key generation: The platform will request a signature to derive a Stark Key. This L2 key is used by the ZK-Rollup mathematical engine to verify that the order was placed by you.
3. Creating an API Key: Go to the API settings. The system will generate an Account ID (API Key) and a Secret Key, required for signing HTTP headers.

Important: When placing an order via the private API, the order body is signed with your L2 Stark Key (Stark Signature), while the HTTP request itself is protected by headers based on your Secret Key.

The EdgeX API offers two main interaction interfaces:

• REST API (pull model): Placing and canceling orders, balance queries and trade history.
• WebSocket API (push model): Instant order book updates (15 or 200 levels of depth), real-time trade streams and private account events.

Environments reference

• Mainnet REST (EdgeX): https://pro.edgex.exchange
• Mainnet WebSocket: wss://quote.edgex.exchange
• Authentication: Private (Third-party) API calls require building signatures based on your key; the specifications are described in detail in the EdgeX documentation (GitBook).

When writing trading algorithms, it is important to handle server responses correctly. Main errors of the StarkEx / EdgeX engine:

To get started quickly with the EdgeX infrastructure, check out our materials:

• Python Trading Bot for EdgeX — Working with StarkEx signing libraries and building limit orders.
• Streaming WebSocket Data (Node.js) — Receiving the order book and aggregated trades without delays.
• Integration Examples and Building API Clients — Code snippets for the REST API.

Availability Check (Public API)

To test connectivity, request the list of available trading pairs (this endpoint requires no authentication):

curl -X GET "https://pro.edgex.exchange/api/v1/symbols"

Node.js: Fetching the Order Book

An example using axios to fetch the order book for the BTC-USDT pair (collateral on EdgeX is USDT):

const axios = require('axios');

async function getOrderbook() {
  try {
    const response = await axios.get('https://pro.edgex.exchange/api/v1/depth', {
      params: {
        symbol: 'BTC-USDT',
        limit: 5
      }
    });
    console.log("Топ 5 заявок Ask:", response.data.data.asks);
  } catch (error) {
    console.error("Ошибка API:", error.response ? error.response.data : error.message);
  }
}

getOrderbook();

Algorithmic Trading via FMZ

The FMZ Quant platform ships built-in, fully functional support for EdgeX DEX. You don't need to write L2 signature logic from scratch. In the FMZ dashboard, add a new exchange, select EdgeX, and enter your AccountID (Access Key) and SecretKey.

This lets you instantly launch complex strategies (e.g., "Grid Trading" or multi-level Bollinger Bands arbitrage) using the platform's ready-made interfaces, broadcasting orders straight into the EdgeX ZK engine.