pyth

Use the HermesClient from @pythnetwork/hermes-client and call getLatestPriceUpdates with an array of hex feed IDs. The response includes parsed price, confidence, exponent, and publish time, plus binary data for on-chain posting.

Add pyth-solana-receiver-sdk to Cargo.toml and accept a PriceUpdateV2 account in your instruction. Call get_price_no_older_than with the Clock sysvar and a max age in seconds to get a validated price.

The spot price is the latest aggregated price, while the EMA price is an exponential moving average over roughly a one-hour window weighted by inverse confidence. EMA prices suit liquidations and collateral valuation because they resist short-term manipulation.

PriceTooOld occurs when the price publish time exceeds your maximum age threshold relative to the Solana clock. Post a fresh price update in the same transaction before consuming it, or increase the max age parameter.

Compute the confidence ratio in basis points by dividing conf by the absolute price and multiplying by 10000, then require it stays below a threshold such as 200 basis points. Reject the transaction when confidence is too wide.

The public Hermes endpoint at https://hermes.pyth.network allows about 10 requests per second, 5 concurrent connections, and up to 100 feeds per request. Production applications should use a dedicated endpoint from a Pyth data provider.