Pyth
Pyth is an Oracle used to get real-world financial and crypto market data. Pyth Oracle can be used by on-chain programs in consuming data for a variety of use cases.
How to use Pyth in Client
Pyth provides a JavaScript/TypeScript library called @pythnetwork/client. This library can be used to read on-chain Pyth Data for off-chain applications, such as displaying the Pyth price on a website. Learn more about this here
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import * as web3 from "@solana/web3.js";
import * as pyth from "@pythnetwork/client";
(async () => {
const connection = new web3.Connection(
web3.clusterApiUrl("devnet"),
"confirmed"
);
const pythConnection = new pyth.PythConnection(
connection,
pyth.getPythProgramKeyForCluster("devnet")
);
pythConnection.onPriceChange((product, price) => {
if (price.price && price.confidence) {
console.log(
`${product.symbol}: $${price.price} \xB1$${price.confidence}`
);
} else {
console.log(
`${product.symbol}: price currently unavailable. status is ${price.status}`
);
}
});
pythConnection.start();
})();
const pythConnection = new pyth.PythConnection(
connection,
pyth.getPythProgramKeyForCluster("devnet")
);
pythConnection.onPriceChange((product, price) => {
if (price.price && price.confidence) {
console.log(`${product.symbol}: $${price.price} \xB1$${price.confidence}`);
} else {
console.log(
`${product.symbol}: price currently unavailable. status is ${price.status}`
);
}
});
pythConnection.start();
How to use Pyth in Anchor
Pyth provides a Rust Crate which can be used by on-chain programs or off-chain application's to consume pyth's data.
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use anchor_lang::prelude::*;
use pyth_client::{self, load_price, Price};
declare_id!("6B7XgKFmo73geJY8ZboSpLhkTumvwXeCXBpeP7nCT35w");
#[program]
pub mod pyth_test {
use super::*;
pub fn get_sol_price(ctx: Context<SolPrice>) -> Result<()> {
let pyth_price_info = &ctx.accounts.pyth_account;
let pyth_price_data = &pyth_price_info.try_borrow_data()?;
let price_account: Price = *load_price(pyth_price_data).unwrap();
msg!("price_account .. {:?}", pyth_price_info.key);
msg!("price_type ... {:?}", price_account.ptype);
msg!("price ........ {}", price_account.agg.price);
Ok(())
}
}
#[derive(Accounts)]
pub struct SolPrice<'info> {
#[account(mut)]
pub user_account: Signer<'info>,
pub pyth_account: UncheckedAccount<'info>,
pub system_program: UncheckedAccount<'info>,
pub rent: Sysvar<'info, Rent>,
}
let pyth_price_info = &ctx.accounts.pyth_account;
let pyth_price_data = &pyth_price_info.try_borrow_data()?;
let price_account: Price = *load_price(pyth_price_data).unwrap();