How To Fetch Price Updates

The following guide explains how to fetch price updates. Price updates can be submitted to the Pyth Price Feeds contract to update the on-chain price. Please see What is a Pull Oracle? to learn more.

Price updates are served from Hermes, which provides three different ways to fetch price updates:

ℹ️

Fetching a price from Hermes requires a price feed ID. This ID serves as a unique identifier for each price feed (e.g., BTC/USD). The complete list of Pyth price feed IDs is available at https://pyth.network/developers/price-feed-ids (opens in a new tab)

REST API

Hermes exposes several endpoints to fetch the price updates. Use the /v2/updates/price/latest endpoint to fetch the latest price update for one or more feeds. This endpoint allows you to fetch the latest price updates for multiple feeds in a single request. For example, the following command retrieves the latest price updates for BTC/USD and ETH/USD:

curl -X 'GET' \
  'https://hermes.pyth.network/v2/updates/price/latest?ids%5B%5D=0xe62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43&ids%5B%5D=0xc96458d393fe9deb7a7d63a0ac41e2898a67a7750dbd166673279e06c868df0a'

The output will be similar to the following containing the requested price update:

{
  "binary": {
    "encoding": "hex",
    "data": [
      "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"
    ]
  },
  "parsed": [
    {
      "id": "e62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43",
      "price": {
        "price": "6140993501000",
        "conf": "3287868567",
        "expo": -8,
        "publish_time": 1714746101
      },
      "ema_price": {
        "price": "6094004700000",
        "conf": "3792887800",
        "expo": -8,
        "publish_time": 1714746101
      },
      "metadata": {
        "slot": 138881186,
        "proof_available_time": 1714746103,
        "prev_publish_time": 1714746101
      }
    },
    {
      "id": "c96458d393fe9deb7a7d63a0ac41e2898a67a7750dbd166673279e06c868df0a",
      "price": {
        "price": "4959503",
        "conf": "5465",
        "expo": -8,
        "publish_time": 1714746101
      },
      "ema_price": {
        "price": "4982594",
        "conf": "5536",
        "expo": -8,
        "publish_time": 1714746101
      },
      "metadata": {
        "slot": 138881186,
        "proof_available_time": 1714746103,
        "prev_publish_time": 1714746101
      }
    }
  ]
}

Hermes offers several other endpoints for retrieving price updates. For more information, see the Hermes API Reference (opens in a new tab).

Streaming

Hermes also provides a Server-Sent Events (SSE) endpoint to stream price updates. The /v2/updates/price/stream endpoint continuously streams price updates for the requested feeds to the caller.

The connection will automatically close after 24 hours to prevent resource leaks. Clients should implement reconnection logic to maintain continuous price updates.

For example, to stream price updates for BTC/USD, run:

curl -N 'https://hermes.pyth.network/v2/updates/price/stream?ids[]=0xe62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43'

The output is a stream of events containing the requested price updates, similar to the following:

data:{"binary":{"encoding":"hex","data":["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"]},"parsed":[{"id":"e62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43","price":{"price":"6163260000000","conf":"3268548079","expo":-8,"publish_time":1714748300},"ema_price":{"price":"6130098800000","conf":"3587162000","expo":-8,"publish_time":1714748300},"metadata":{"slot":138886134,"proof_available_time":1714748302,"prev_publish_time":1714748300}}]}
 
data:{"binary":{"encoding":"hex","data":["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"]},"parsed":[{"id":"e62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43","price":{"price":"6163088000000","conf":"3308129843","expo":-8,"publish_time":1714748301},"ema_price":{"price":"6130103000000","conf":"3587126400","expo":-8,"publish_time":1714748301},"metadata":{"slot":138886135,"proof_available_time":1714748302,"prev_publish_time":1714748300}}]}

SDK

Pyth provides a typescript SDK for Hermes to fetch price updates. The HermesClient (opens in a new tab) class in this SDK (opens in a new tab) connects to Hermes to fetch and stream price updates.

const connection = new HermesClient("https://hermes.pyth.network", {});
 
const priceIds = [
  // You can find the ids of prices at https://pyth.network/developers/price-feed-ids
  "0xe62df6c8b4a85fe1a67db44dc12de5db330f7ac66b72dc658afedf0f4a415b43", // BTC/USD price id
  "0xff61491a931112ddf1bd8147cd1b641375f79f5825126d665480874634fd0ace", // ETH/USD price id
];
 
// Get price feeds
// You can also fetch price feeds for other assets by specifying the asset name and asset class.
const priceFeeds = await connection.getPriceFeeds("btc", "crypto");
console.log(priceFeeds);
 
// Latest price updates
const priceUpdates = await connection.getLatestPriceUpdates(priceIds);
console.log(priceUpdates);

HermesClient also allows subscribing to real-time price updates over a Server-Sent Events (SSE) connection:

// Streaming price updates
const eventSource = await connection.getStreamingPriceUpdates(priceIds);
 
eventSource.onmessage = (event) => {
  console.log("Received price update:", event.data);
};
 
eventSource.onerror = (error) => {
  console.error("Error receiving updates:", error);
  eventSource.close();
};
 
await sleep(5000);
 
// To stop listening to the updates, you can call eventSource.close();
console.log("Closing event source.");
eventSource.close();

Last updated on June 7, 2025