> ## Documentation Index
> Fetch the complete documentation index at: https://docs.magicblock.gg/llms.txt
> Use this file to discover all available pages before exploring further.

# Implementation

> Derive the Pyth Lazer price feed account and decode its bytes

## 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](https://github.com/magicblock-labs/real-time-pricing-oracle/blob/main/pyth_lazer_list.json).
* **price program id** — `PriCems5tHihc6UDXDjzjeawomAwBduWMGAi8ZUjppd`

```ts theme={null}
// 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

```ts theme={null}
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);
```

<CardGroup cols={3}>
  <Card title="Live Demo" icon="waveform" href="https://pyth-template.magicblock.app/" iconType="duotone">
    Real‑time price stream
  </Card>

  <Card title="Implementation" icon="book" href="/pages/tools/oracle/implementation" iconType="duotone">
    Learn how to access our oracles onchain
  </Card>

  <Card
    title="Code Example"
    icon="code"
    href="https://github.com/magicblock-labs/real-time-pricing-oracle
"
    iconType="duotone"
  >
    Check out our Github Repo
  </Card>
</CardGroup>