Price Feed
PriceFeed Sample
One common task is to get the price feed of a token and calculate e.g. trading volume. Currently, we provide price feeds for a set of tokens. You can call it from the processor:
import { getPriceByType, token } from "@sentio/sdk/utils"
const price = await getPriceByType(CHAIN_IDS.ETHEREUM, address, ctx.timestamp) || 0
The function signatures are:
interface PriceOptions {
toleranceInDays?: number
}
export async function getPriceByType(
chainId: string,
coinType: string,
date: Date,
options?: PriceOptions
): Promise<number | undefined>
API Semantics
- ChainID is consistent everywhere in the processor. You could use
CHAIN_IDS.ETHEREUM
- CoinType is the contract address for the ERC-20 token (e.g.
0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
) and Type for Aptos (e.g.0x1::aptos_coin::AptosCoin
) - The returned price has a timestamp associated with it.
toleranceInDays
is an optional field. If missing, we use 1 DAY. This means that historical token prices are acceptable up to 1 day in time difference. - If there is an error, or the timestamp diff is larger than 1 DAY, an
undefined
is returned. - In theory, it is possible to obtain price by symbol. However, it is not recommended since symbol can be quite misleading
getPriceBySymbol(symbol: string, date: Date, options?: PriceOptions)
Updated about 1 month ago