Guides

Price Feed

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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 5 months ago