replace blocktimestamp, don't use chainlink for gasprice

src/hooks/useAutoSlippageTolerance.ts

@@ -1,69 +1,13 @@
-import { MixedRoute, partitionMixedRouteByProtocol, Protocol, Trade } from '@uniswap/router-sdk'
-import { Currency, CurrencyAmount, Percent, TradeType } from '@uniswap/sdk-core'
-import { Pair } from '@uniswap/v2-sdk'
-import { Pool } from '@uniswap/v3-sdk'
+import { Percent } from '@uniswap/sdk-core'
 import { useWeb3React } from '@web3-react/core'
-import { SUPPORTED_GAS_ESTIMATE_CHAIN_IDS } from 'constants/chains'
 import { L2_CHAIN_IDS } from 'constants/chains'
-import JSBI from 'jsbi'
-import useNativeCurrency from 'lib/hooks/useNativeCurrency'
 import { useMemo } from 'react'
 import { ClassicTrade } from 'state/routing/types'
 
-import useGasPrice from './useGasPrice'
-import useStablecoinPrice, { useStablecoinAmountFromFiatValue, useStablecoinValue } from './useStablecoinPrice'
+import { useStablecoinAmountFromFiatValue, useStablecoinValue } from './useStablecoinPrice'
 
 const DEFAULT_AUTO_SLIPPAGE = new Percent(5, 1000) // 0.5%
 
-// Base costs regardless of how many hops in the route
-const V3_SWAP_BASE_GAS_ESTIMATE = 100_000
-const V2_SWAP_BASE_GAS_ESTIMATE = 135_000
-
-// Extra cost per hop in the route
-const V3_SWAP_HOP_GAS_ESTIMATE = 70_000
-const V2_SWAP_HOP_GAS_ESTIMATE = 50_000
-
-/**
- * Return a guess of the gas cost used in computing slippage tolerance for a given trade
- * @param trade the trade for which to _guess_ the amount of gas it would cost to execute
- *
- * V3 logic is inspired by:
- * https://github.com/Uniswap/smart-order-router/blob/main/src/routers/alpha-router/gas-models/v3/v3-heuristic-gas-model.ts
- * V2 logic is inspired by:
- * https://github.com/Uniswap/smart-order-router/blob/main/src/routers/alpha-router/gas-models/v2/v2-heuristic-gas-model.ts
- */
-function guesstimateGas(trade: Trade<Currency, Currency, TradeType> | undefined): number | undefined {
-  if (trade) {
-    let gas = 0
-    for (const { route } of trade.swaps) {
-      if (route.protocol === Protocol.V2) {
-        gas += V2_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V2_SWAP_HOP_GAS_ESTIMATE
-      } else if (route.protocol === Protocol.V3) {
-        // V3 gas costs scale on initialized ticks being crossed, but we don't have that data here.
-        // We bake in some tick crossings into the base 100k cost.
-        gas += V3_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V3_SWAP_HOP_GAS_ESTIMATE
-      } else if (route.protocol === Protocol.MIXED) {
-        const sections = partitionMixedRouteByProtocol(route as MixedRoute<Currency, Currency>)
-        gas += sections.reduce((gas, section) => {
-          if (section.every((pool) => pool instanceof Pool)) {
-            return gas + V3_SWAP_BASE_GAS_ESTIMATE + section.length * V3_SWAP_HOP_GAS_ESTIMATE
-          } else if (section.every((pool) => pool instanceof Pair)) {
-            return gas + V2_SWAP_BASE_GAS_ESTIMATE + (section.length - 1) * V2_SWAP_HOP_GAS_ESTIMATE
-          } else {
-            console.warn('Invalid section')
-            return gas
-          }
-        }, 0)
-      } else {
-        // fallback general gas estimation
-        gas += V3_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V3_SWAP_HOP_GAS_ESTIMATE
-      }
-    }
-    return gas
-  }
-  return undefined
-}
-
 const MIN_AUTO_SLIPPAGE_TOLERANCE = DEFAULT_AUTO_SLIPPAGE
 // assuming normal gas speeds, most swaps complete within 3 blocks and
 // there's rarely price movement >5% in that time period
@@ -77,35 +21,16 @@ export default function useClassicAutoSlippageTolerance(trade?: ClassicTrade): P
   const { chainId } = useWeb3React()
   const onL2 = chainId && L2_CHAIN_IDS.includes(chainId)
   const outputDollarValue = useStablecoinValue(trade?.outputAmount)
-  const nativeGasPrice = useGasPrice()
 
-  const gasEstimate = guesstimateGas(trade)
   const gasEstimateUSD = useStablecoinAmountFromFiatValue(trade?.gasUseEstimateUSD) ?? null
-  const nativeCurrency = useNativeCurrency(chainId)
-  const nativeCurrencyPrice = useStablecoinPrice((trade && nativeCurrency) ?? undefined)
 
   return useMemo(() => {
     if (!trade || onL2) return DEFAULT_AUTO_SLIPPAGE
 
-    const nativeGasCost =
-      nativeGasPrice && typeof gasEstimate === 'number'
-        ? JSBI.multiply(nativeGasPrice, JSBI.BigInt(gasEstimate))
-        : undefined
-    const dollarGasCost =
-      nativeCurrency && nativeGasCost && nativeCurrencyPrice
-        ? nativeCurrencyPrice.quote(CurrencyAmount.fromRawAmount(nativeCurrency, nativeGasCost))
-        : undefined
-
-    // if valid estimate from api and using api trade, use gas estimate from api
-    // NOTE - dont use gas estimate for L2s yet - need to verify accuracy
-    // if not, use local heuristic
-    const dollarCostToUse =
-      chainId && SUPPORTED_GAS_ESTIMATE_CHAIN_IDS.includes(chainId) && gasEstimateUSD ? gasEstimateUSD : dollarGasCost
-
-    if (outputDollarValue && dollarCostToUse) {
+    if (outputDollarValue && gasEstimateUSD) {
       // optimize for highest possible slippage without getting MEV'd
       // so set slippage % such that the difference between expected amount out and minimum amount out < gas fee to sandwich the trade
-      const fraction = dollarCostToUse.asFraction.divide(outputDollarValue.asFraction)
+      const fraction = gasEstimateUSD.asFraction.divide(outputDollarValue.asFraction)
       const result = new Percent(fraction.numerator, fraction.denominator)
       if (result.greaterThan(MAX_AUTO_SLIPPAGE_TOLERANCE)) {
         return MAX_AUTO_SLIPPAGE_TOLERANCE
@@ -119,15 +44,5 @@ export default function useClassicAutoSlippageTolerance(trade?: ClassicTrade): P
     }
 
     return DEFAULT_AUTO_SLIPPAGE
-  }, [
-    trade,
-    onL2,
-    nativeGasPrice,
-    gasEstimate,
-    nativeCurrency,
-    nativeCurrencyPrice,
-    chainId,
-    gasEstimateUSD,
-    outputDollarValue,
-  ])
+  }, [trade, onL2, gasEstimateUSD, outputDollarValue])
 }

src/hooks/useCurrentBlockTimestamp.ts

@@ -1,15 +1,5 @@
 import { BigNumber } from '@ethersproject/bignumber'
-import { useSingleCallResult } from 'lib/hooks/multicall'
-import { useMemo } from 'react'
-
-import { useInterfaceMulticall } from './useContract'
-
 // gets the current timestamp from the blockchain
-export default function useCurrentBlockTimestamp(): BigNumber | undefined {
-  const multicall = useInterfaceMulticall()
-  const resultStr: string | undefined = useSingleCallResult(
-    multicall,
-    'getCurrentBlockTimestamp'
-  )?.result?.[0]?.toString()
-  return useMemo(() => (typeof resultStr === 'string' ? BigNumber.from(resultStr) : undefined), [resultStr])
+export default function useCurrentBlockTimestamp(): BigNumber {
+  return BigNumber.from(BigInt(Math.floor(Date.now() / 1000)))
 }

src/hooks/useUSDPrice.ts

@@ -3,17 +3,12 @@ import { useMemo } from 'react'
 
 import useStablecoinPrice from './useStablecoinPrice'
 
-export function useUSDPrice(
-  currencyAmount?: CurrencyAmount<Currency>,
-  prefetchCurrency?: Currency
-): {
+export function useUSDPrice(currencyAmount?: CurrencyAmount<Currency>): {
   data?: number
   isLoading: boolean
 } {
-  const currency = currencyAmount?.currency ?? prefetchCurrency
-
   // Use USDC-based pricing for chains.
-  const stablecoinPrice = useStablecoinPrice(currency)
+  const stablecoinPrice = useStablecoinPrice(currencyAmount?.currency)
 
   return useMemo(() => {
     if (currencyAmount && stablecoinPrice) {

src/pages/Swap/index.tsx

@@ -313,18 +313,12 @@ function Swap({
 
   const showFiatValueInput = Boolean(parsedAmounts[Field.INPUT])
   const showFiatValueOutput = Boolean(parsedAmounts[Field.OUTPUT])
-  const getSingleUnitAmount = (currency?: Currency) => {
-    if (!currency) return
-    return CurrencyAmount.fromRawAmount(currency, JSBI.BigInt(10 ** currency.decimals))
-  }
 
   const fiatValueInput = useUSDPrice(
-    parsedAmounts[Field.INPUT] ?? getSingleUnitAmount(currencies[Field.INPUT]),
-    currencies[Field.INPUT]
+    parsedAmounts[Field.INPUT] && showFiatValueInput ? parsedAmounts[Field.INPUT] : undefined
   )
   const fiatValueOutput = useUSDPrice(
-    parsedAmounts[Field.OUTPUT] ?? getSingleUnitAmount(currencies[Field.OUTPUT]),
-    currencies[Field.OUTPUT]
+    parsedAmounts[Field.OUTPUT] && showFiatValueOutput ? parsedAmounts[Field.OUTPUT] : undefined
   )
 
   const [routeNotFound, routeIsLoading, routeIsSyncing] = useMemo(