Stream Trade

Stream trade is a method used to obtain the prices of a specific pair of tokens across multiple decentralized exchanges (DEXs). (Currently Available for Ethereum Only)

Response Schema:

Field	Description
type	Type of transaction.
platform	Specific name of DEX platform.
symbol	Token pair.
price	Price of token pair.

Streaming trades:

Users can stream trades in two ways:

Example 1: via wscat script (For Linux based distro)

First, the user needs to run the following command in their terminal to install wscat in their system:

npm install -g wscat 

After installing wscat, the user needs to create a shell script and paste the following sample code:

Client Side Sample Socket Code :

#!/bin/bash

echo "Price Discovery\n"
read -p "x-api-key: " YOUR_API_KEY
wscat -c wss://pricediscovery.expand.network -H authorization:secret-token -H x-api-key:$YOUR_API_KEY

Once the file has been saved, the user will need to grant permission for it to be executed. This can be accomplished by executing the following command:

chmod +x YOUR_FILE_NAME.sh

After following the above steps, the user needs to run the file. This can be done by entering the filename in the console.

Executing a query:

After executing the aforementioned file(shell script), the user will be prompted to input the appropriate API key.

After entering the API key, the user can subscribe to the following actions:

{"action": "streamTrade"}

Make sure you are connected to the WebSocket before you perform the following queries.

Applying a filter in the query:

Users can apply the following filters in their query:-

• token0

• token1

The above filters can be applied in any combination, using the following syntax:

{"action": "streamTrade", "token0": "token_address", "token1": "token_address" }

Sample Query:

{"action": "streamTrade", "token0": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2", "token1": "0xdAC17F958D2ee523a2206206994597C13D831ec7" }

Example 2. via javascript code

First, the user needs to run the following command in their terminal to install wscat in their system:

npm i ws

After installing ws, the user needs to run the following sample code on their device to start streaming:

Client Side Sample Socket Code :

const WebSocket = require('ws');
const url = 'wss://pricediscovery.expand.network';
const options = {
  headers: {
    Authorization: 'secret-token',
    'x-api-key': 'YOUR_API_KEY', // Replace this with your API Key
  }
};

const ws = new WebSocket(url, options);

ws.on('open', () => {
  console.log('WebSocket connection established.');
  const payload = {
    action: "streamTrade",
    token0: "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
    token1: "0xdAC17F958D2ee523a2206206994597C13D831ec7"
  };
  ws.send(JSON.stringify(payload));
});


ws.on('message', (data) => {
  console.log(`Received data: ${data}`);
});

ws.on('close', () => {
  console.log('WebSocket connection closed.');
});

The payload can be modified, depending on the action.

Expected Output:

{
  "type": "DEX",
  "platform": "UniswapV2",
  "symbol": "ETHUSDT",
  "price": "1731798672"
}

How to disconnect:

To disconnect from our API, enter ctrl-c in the connected console.