Hermes
Learn how Hermes delivers Pyth price updates and how to access it
Hermes is a web service that listens to the Pythnet and the Wormhole Network for Pyth price updates, and serves them via a convenient web API. It provides Pyth's latest price update data format that are more cost-effective to verify and use on-chain.
Hermes allows users to easily query for recent price updates via a REST API, or subscribe to a server-side events stream for streaming updates. The Pyth Network's Javascript SDKs connect to an instance of Hermes to fetch price updates.
Pyth Core was upgraded on August 26, 2026
- We recommend new integrations use the upgraded contract addresses.
- Existing integrations using the current addresses were automatically upgraded by the DAO on August 26, 2026. See the upgrade guide for details.
Documentation
The Hermes API Documentation provides a comprehensive explanation of Hermes API for user interaction. You can use the @pythnetwork/hermes-client library to interact with Hermes.
Here's an example of retrieving the latest update of the ETH/USD price feed using curl.
# Example API call
$ curl -H "Authorization: Bearer $PYTH_API_KEY" \
"https://pyth.dourolabs.app/hermes/api/latest_price_feeds?ids[]=0xff61491a931112ddf1bd8147cd1b641375f79f5825126d665480874634fd0ace"
# Example Response
[{"id":"ff61491a931112ddf1bd8147cd1b641375f79f5825126d665480874634fd0ace","price":{"price":"184136023127","conf":"177166324","expo":-8,"publish_time":1692110601},"ema_price":{"price":"184100641000","conf":"178704085","expo":-8,"publish_time":1692110601}}]Accessing Hermes
Hermes can be accessed through a third-party provider (similar to a blockchain RPC). The Pyth Data Association also operates a public instance for development purposes. Please see Hermes API Instances and Providers for more details.