You can find the list of supported assets here.

The current Pragma addresses are:

NetworkAddressExplorer
Starknet Mainnet0x2a85bd616f912537c50a49a4076db02c00b29b2cdc8a197ce92ed1837fa875bStarkscan Voyager
Starknet Sepolia0x36031daa264c24520b11d93af622c848b2499b66b41d611bac95e13cfca131aStarkscan Voyager

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Sample Code

If you are just trying to get started with our price feeds, see the self-contained code snippets below. If you’d like to use more advanced oracle functions please see the further information below. You can find a full sample data feed consumer contract here and the full Oracle interface specification is available here.

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Add Pragma as a dependency to your scarb/snforge project

scarb add pragma_lib --git https://github.com/astraly-labs/pragma-lib

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BTC/USD Spot Median Price

use pragma_lib::abi::{IPragmaABIDispatcher, IPragmaABIDispatcherTrait};
use pragma_lib::types::{AggregationMode, DataType, PragmaPricesResponse};
use starknet::ContractAddress;
use starknet::contract_address::contract_address_const;

const KEY :felt252 = 18669995996566340; // felt252 conversion of "BTC/USD"

fn get_asset_price_median(oracle_address: ContractAddress, asset : DataType) -> u128  {
    let oracle_dispatcher = IPragmaABIDispatcher{contract_address : oracle_address};
    let output : PragmaPricesResponse= oracle_dispatcher.get_data(asset, AggregationMode::Median(()));
    return output.price;
}

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SOL/USD Spot Average Price, filtered by sources


use pragma_lib::abi::{IPragmaABIDispatcher, IPragmaABIDispatcherTrait};
use pragma_lib::types::{AggregationMode, DataType, PragmaPricesResponse};
use starknet::ContractAddress;
use starknet::contract_address::contract_address_const;
use array::ArrayTrait;

const KEY: felt252 = 23449611697214276; // felt252 conversion of "SOL/USD", can also write const KEY : felt252 = 'SOL/USD'
const OKX: felt252 = 'OKX'; // felt252 conversion of "OKX"
const BINANCE: felt252 = 'BINANCE'; // felt252 conversion of "BINANCE"

fn get_asset_price_average(oracle_address: ContractAddress, asset : DataType, sources : Span<felt252>) -> u128  {
    let oracle_dispatcher = IPragmaABIDispatcher{contract_address : oracle_address};
    let output : PragmaPricesResponse= oracle_dispatcher.get_data_for_sources(asset, AggregationMode::Mean(()), sources);

    return output.price;
}

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BTC/USD Future Price

use pragma_lib::abi::{IPragmaABIDispatcher, IPragmaABIDispatcherTrait};
use pragma_lib::types::{AggregationMode, DataType, PragmaPricesResponse};
use starknet::ContractAddress;
use starknet::contract_address::contract_address_const;

const KEY :felt252 = 18669995996566340; // felt252 conversion of "BTC/USD", can write const KEY : felt252 = 'BTC/USD'

fn get_asset_price_median(oracle_address: ContractAddress, asset : DataType) -> u128  {
    let oracle_dispatcher = IPragmaABIDispatcher{contract_address : oracle_address};
    let output : PragmaPricesResponse= oracle_dispatcher.get_data(asset, AggregationMode::Median(()));

    return output.price;
}

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Conversion Rate

For some assets such as liquid staking tokens, it’s actually more relevant to use the conversion rate rather than the market price given the liquidity is often poor for these assets. To use this special aggregation method, the base token first needs to be associated to a vault address which follows the ERC4626 standard.

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Sample code

use pragma_lib::abi::{IPragmaABIDispatcher, IPragmaABIDispatcherTrait};
use pragma_lib::types::{AggregationMode, DataType, PragmaPricesResponse};
use starknet::ContractAddress;
use starknet::contract_address::contract_address_const;

const KEY :felt252 = 1629317993172502401860; // felt252 conversion of "XSTRK/USD", can write const KEY : felt252 = 'XSTRK/USD'

fn get_asset_conversion_rate(oracle_address: ContractAddress, asset : DataType) -> u128  {
    let oracle_dispatcher = IPragmaABIDispatcher{contract_address : oracle_address};
    let output : PragmaPricesResponse= oracle_dispatcher.get_data(asset,AggregationMode::ConversionRate);

    return output.price;
}

Alternatively, we implemented a specialized conversion rate feed that automatically calculates the conversion rate for specific feeds. Calling these feeds follows a process similar to retrieving spot BTC/USD prices.

Supported feeds:

PairPair IdDecimals
CONVERSION_XSTRK/USD3842709646306115891515043360401754408918485123248
CONVERSION_SSTRK/USD3842709646306115891515043359479417205233007542448
use pragma_lib::abi::{IPragmaABIDispatcher, IPragmaABIDispatcherTrait};
use pragma_lib::types::{AggregationMode, DataType, PragmaPricesResponse};
use starknet::ContractAddress;
use starknet::contract_address::contract_address_const;

const KEY :felt252 = 384270964630611589151504336040175440891848512324; // felt252 conversion of "CONVERSION_XSTRK/USD", can write const KEY : felt252 = 'CONVERSION_XSTRK/USD'

fn get_asset_conversion_rate(oracle_address: ContractAddress, asset : DataType) -> u128  {
    let oracle_dispatcher = IPragmaABIDispatcher{contract_address : oracle_address};
    let output : PragmaPricesResponse = oracle_dispatcher.get_data(asset,AggregationMode::Median);

    return output.price;
}

It will only work with the Median aggregation mode.

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Technical Specification

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