Price feed
To create your price feed services, you use any API provider to get the price of a token. With Livy you can easily make it verifiable too.
For this example, we will use Coinbase's API.
Before you start
Create your Livy account or create one. Then, create your verifiable application.
Write your code
For this example, we will use the Binance API:
use reqwest;
use serde::Deserialize;
use clap::Parser;
#[derive(Deserialize)]
struct CoinbaseData {
amount: String,
}
#[derive(Deserialize)]
struct CoinbaseResponse {
data: CoinbaseData,
}
#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Args {
#[arg(short, long)]
symbol: String, // ETH-USD or BTC-USD
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let args = Args::parse();
let url = format!("https://api.coinbase.com/v2/prices/{}/spot", args.symbol);
let response = reqwest::get(&url).await?;
let coinbase_response: CoinbaseResponse = response.json().await?;
println!("{}", coinbase_response.data.amount);
Ok(())
}Information
By using clap crate, Livy can parse the arguments passed to the application and autofills the execution arguments.
Add the "Cargo.toml" file:
[package]
name = "price-feed"
version = "0.1.0"
edition = "2021"
[dependencies]
reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
tokio = { version = "1.0", features = ["full"] }
clap = { version = "4.0", features = ["derive"] } Deploy your application
Deploy your application by clicking the "Create Service" button.