Implementation - MagicBlock Documentation

Deriving the Price Feed Account

We derive the PDA of the price account using the following seeds:

“price feed” (buffer)
“pyth-lazer” (buffer)
feedID (buffer) — the asset you want. Find the supported feeds here.
price program id — PriCems5tHihc6UDXDjzjeawomAwBduWMGAi8ZUjppd

// seeds: ["price_feed", "pyth-lazer", feed_id_as_string]
function deriveFeedAddress (feedId: string) {
  const [addr] = web3.PublicKey.findProgramAddressSync(
  [Buffer.from('price_feed'), Buffer.from('pyth-lazer'), Buffer.from(feedId)],
  PROGRAM ID
  );
  return addr
}

Parsing the Account

The on‑chain account stores a header and fields for price data. We read raw bytes and decode.

Price offset: 73 bytes from start
Type: signed 64‑bit integer (i64)
Apply exponent: scale the raw price using the account’s exponent

const addr = deriveFeedAddress(feed.id);
const PRICE_OFFSET = 73;

const dv = new DataView(ai.data.buffer, ai.data.byteOffset, ai.data.byteLength);
const raw = dv.getBigUint64(PRICE_OFFSET, true);
const price = Number(raw) * Math.pow(10, feed.exponent);

Live Demo

Real‑time price stream

Implementation

Learn how to access our oracles onchain

Code Example

Check out our Github Repo

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