Price Feeds
Chainlink Data Feeds provide data that is aggregated from many data sources by a decentralized set of independent node operators. The Decentralized Data Model describes this in detail. However, there are some exceptions where data for a feed can come only from a single data source or where data values are calculated. Read the Selecting Quality Data Feeds to learn about the different data feed categories and how to identify them.
Decimal precision
Feed answers are returned as integers without a decimal point. To convert an answer into a human-readable value, divide it by 10^decimals. For example, an answer of 3030914000000 from a feed with 8 decimals represents 30309.14.
Chainlink generally uses the following decimal standards for new feeds:
| Asset class | Decimals |
|---|---|
| Crypto / USD | 8 |
| Crypto / ETH | 18 |
| Forex | 8 |
| Precious metals | 8 |
| Commodities / Energy | 8 |
| All others | Feed-specific |
These standards are subject to change, individual feeds can differ, and some networks use a single precision for all feeds. For example, feeds on Stellar and Aptos use 18 decimals. This applies to every network, EVM and non-EVM: always read the precision of each feed you use from the feed contract instead of hardcoding a value based on the table above. On EVM chains, call the decimals() function on the feed's proxy contract. On other networks, use the equivalent function described in that network's guide. You can also verify the decimals for a feed on the Price Feed Addresses page by selecting More Details.
Decimal precision is not changed on live feeds. If an asset's price moves to a level where the feed's precision is no longer sufficient for your use case, contact chainlink_data_feeds@smartcontract.com about launching a new feed.