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Read Data from Data Feeds on Starknet using Starknet Foundry

In this example, you will read from a Chainlink price feed on Starknet using the Starknet Foundry toolkit. You will call the latest_round_data function on the ETH / USD aggregator proxy contract to read the latest round of data.


Make sure you have the Starknet Foundry toolkit installed. You can check your current version by running snforge --version or sncast --version in your terminal. Follow the installation guide if necessary.


Run the following command to read data from the ETH / USD data feed proxy contract:

sncast \
  --url \
  call \
  --contract-address 0x228128e84cdfc51003505dd5733729e57f7d1f7e54da679474e73db4ecaad44 \
  --function "latest_round_data" \

Expect an output similar to the following:

command: call
response: [0x10000000000000000000000000000320c, 0x5293770eb1, 0xd44d, 0x6606b8cc, 0x6606b8a2]

The example output contains an array with the hex-encoded latest round of data for the ETH / USD price feed. The array contains the following values:

Value nameHex-encoded valueDecoded valueDescription
round_id0x10000000000000000000000000000320c340282366920938463463374607431768224268The unique identifier of the data round
answer0x5293770eb1354661371569The actual data provided by the data feed, representing the latest price of an asset in the case of a price feed
block_num0xd44d54349The block number at which the data was recorded on the blockchain
started_at0x6606b8cc1711716556The Unix timestamp indicating when the data round started
updated_at0x6606b8a21711716514The Unix timestamp indicating when the data was last updated

For a complete list of Chainlink Price Feeds available on Starknet, see the Price Feed Contract Addresses page.

Note: This example uses a Blast API RPC endpoint. You can interact with the network using any other Starknet Sepolia RPC provider, such as Alchemy or Infura.

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