diff --git a/src/custom/api/coingecko/index.ts b/src/custom/api/coingecko/index.ts
index 7de810c0dd..5e1a34ddbf 100644
--- a/src/custom/api/coingecko/index.ts
+++ b/src/custom/api/coingecko/index.ts
@@ -99,5 +99,5 @@ export function toPriceInformation(priceRaw: CoinGeckoUsdQuote | null): PriceInf
   }
 
   const { usd } = priceRaw[token]
-  return { amount: usd.toString(), token }
+  return { amount: usd.toString(), token, oppositeAmount: '1' }
 }
diff --git a/src/custom/api/gnosisProtocol/api.ts b/src/custom/api/gnosisProtocol/api.ts
index 04cef488e4..040e289277 100644
--- a/src/custom/api/gnosisProtocol/api.ts
+++ b/src/custom/api/gnosisProtocol/api.ts
@@ -353,7 +353,12 @@ async function _handleQuoteResponse<T = any, P extends FeeQuoteParams = FeeQuote
         },
       })
     } else {
-      return response.json()
+      const rawResponse = await response.json()
+      // The legacy quote endpoint does takes as part of the URL path the amount in
+      // and returns as response the amount out
+      // Since now we'll need to keep track of both, here we add to the response the amount in as oppositeAmount
+      const oppositeAmount = params.amount
+      return { ...rawResponse, oppositeAmount }
     }
   } catch (error) {
     throw _handleError(error, response, params, 'QUOTE')
diff --git a/src/custom/api/matcha-0x/index.ts b/src/custom/api/matcha-0x/index.ts
index 6fdc52b2d6..233d4e2f31 100644
--- a/src/custom/api/matcha-0x/index.ts
+++ b/src/custom/api/matcha-0x/index.ts
@@ -138,8 +138,8 @@ export function toPriceInformation(priceRaw: MatchaPriceQuote | null, kind: Orde
   const { sellAmount, buyAmount, sellTokenAddress, buyTokenAddress } = priceRaw
 
   if (kind === OrderKind.BUY) {
-    return { amount: sellAmount, token: sellTokenAddress }
+    return { amount: sellAmount, oppositeAmount: buyAmount, token: sellTokenAddress }
   } else {
-    return { amount: buyAmount, token: buyTokenAddress }
+    return { amount: buyAmount, oppositeAmount: sellAmount, token: buyTokenAddress }
   }
 }
diff --git a/src/custom/api/paraswap/index.ts b/src/custom/api/paraswap/index.ts
index 78a370b3f3..6486bab90d 100644
--- a/src/custom/api/paraswap/index.ts
+++ b/src/custom/api/paraswap/index.ts
@@ -44,11 +44,13 @@ export function toPriceInformation(priceRaw: ParaSwapPriceQuote | null): PriceIn
   if (side === SwapSide.SELL) {
     return {
       amount: destAmount,
+      oppositeAmount: srcAmount,
       token: destToken,
     }
   } else {
     return {
       amount: srcAmount,
+      oppositeAmount: destAmount,
       token: srcToken,
     }
   }
diff --git a/src/custom/state/price/reducer.ts b/src/custom/state/price/reducer.ts
index e08b60a9b2..0ba471fdf7 100644
--- a/src/custom/state/price/reducer.ts
+++ b/src/custom/state/price/reducer.ts
@@ -47,6 +47,7 @@ function initializeState(
 function getResetPrice(sellToken: string, buyToken: string, kind: OrderKind) {
   return {
     amount: null,
+    oppositeAmount: null,
     // When we buy, the price estimation is given in sell tokens (if we sell, we give it in sell tokens)
     // The price estimation is given in:
     //    - sell tokens (for buy orders)
diff --git a/src/custom/utils/price.ts b/src/custom/utils/price.ts
index d7a8c3b220..adbedafa8b 100644
--- a/src/custom/utils/price.ts
+++ b/src/custom/utils/price.ts
@@ -43,6 +43,8 @@ export interface FeeInformation {
 export interface PriceInformation {
   token: string
   amount: string | null
+  oppositeAmount: string | null
+  // quoteId?: string // TODO fill in this info if we have it
 }
 
 // GetQuoteResponse from @cowprotocol/contracts types Timestamp and BigNumberish
@@ -54,6 +56,7 @@ export type SimpleGetQuoteResponse = Pick<GetQuoteResponse, 'from'> & {
     buyAmount: string
     validTo: string
     feeAmount: string
+    // quoteId?: string // TODO: not yet coming from the API, tracked on https://github.com/cowprotocol/services/issues/170
   }
   expiration: string
 }
@@ -110,13 +113,22 @@ function _filterWinningPrice(params: FilterWinningPriceParams) {
   const amount = BigNumberJs[aggregationFunction](...params.amounts).toString(10)
   const token = params.priceQuotes[0].token
 
-  const winningPrices = params.priceQuotes
-    .filter((quote) => quote.amount === amount)
-    .map((p) => p.source)
-    .join(', ')
-  console.debug('[util::filterWinningPrice] Winning price: ' + winningPrices + ' for token ' + token + ' @', amount)
+  const winningPrices = params.priceQuotes.filter((quote) => quote.amount === amount)
+  const oppositeAmount = winningPrices[0]?.oppositeAmount
+
+  console.debug(
+    '[util::filterWinningPrice] Winning price: ' +
+      winningPrices.map((p) => p.source).join(', ') +
+      ' for token ' +
+      token +
+      ' @ ' +
+      amount +
+      ' & oppositeAmount ' +
+      oppositeAmount,
+    winningPrices
+  )
 
-  return { token, amount }
+  return { token, amount, oppositeAmount }
 }
 
 export type QuoteResult = [PromiseSettledResult<PriceInformation>, PromiseSettledResult<FeeInformation>]
@@ -260,10 +272,13 @@ export async function getBestPrice(params: PriceQuoteParams, options?: GetBestPr
 export async function getFullQuote({ quoteParams }: { quoteParams: FeeQuoteParams }): Promise<QuoteResult> {
   const { kind } = quoteParams
   const { quote, expiration: expirationDate } = await getQuote(quoteParams)
+  // TODO: store/pass down as response the buyAmount, sellAmount and quoteId from quote obj
 
   const price = {
     amount: kind === OrderKind.SELL ? quote.buyAmount : quote.sellAmount,
+    oppositeAmount: kind === OrderKind.SELL ? quote.sellAmount : quote.buyAmount,
     token: kind === OrderKind.SELL ? quote.buyToken : quote.sellToken,
+    // quoteId: quote.quoteId,
   }
   const fee = {
     amount: quote.feeAmount,