diff --git a/examples/sell/src/pages/index.tsx b/examples/sell/src/pages/index.tsx
index 6119d87..4e9b4e7 100644
--- a/examples/sell/src/pages/index.tsx
+++ b/examples/sell/src/pages/index.tsx
@@ -129,8 +129,8 @@ const IndexPage = () => {
     exchangeSDK.current
       ?.sell({
         quoteId,
-        accountId: fromAccount,
-        amount: new BigNumber(amount),
+        fromAccountId: fromAccount,
+        fromAmount: new BigNumber(amount),
         feeStrategy: feeSelected as FeeStrategy,
         customFeeConfig,
         getSellPayload: async (nonce, address, amount) => {
diff --git a/lib/src/sdk.test.ts b/lib/src/sdk.test.ts
index e28b878..b37bb31 100644
--- a/lib/src/sdk.test.ts
+++ b/lib/src/sdk.test.ts
@@ -237,8 +237,8 @@ describe("sell", () => {
     });
     const sellData = {
       quoteId: "quoteId",
-      accountId: "id-1",
-      amount: new BigNumber("1.908"),
+      fromAccountId: "id-1",
+      fromAmount: new BigNumber("1.908"),
       feeStrategy: "SLOW" as FeeStrategy,
       getSellPayload: mockSellPayload,
     };
@@ -276,8 +276,8 @@ describe("sell", () => {
 
     const sellData = {
       quoteId: "quoteId",
-      accountId: "id-1",
-      amount: new BigNumber("1.908"),
+      fromAccountId: "id-1",
+      fromAmount: new BigNumber("1.908"),
       feeStrategy: "SLOW" as FeeStrategy,
       toFiat: "EUR",
       rate: 1000,
diff --git a/lib/src/sdk.ts b/lib/src/sdk.ts
index 3945b45..3625ee5 100644
--- a/lib/src/sdk.ts
+++ b/lib/src/sdk.ts
@@ -80,10 +80,10 @@ export type GetSellPayload = (
  */
 export type SellInfo = {
   quoteId?: string;
-  accountId: string;
-  amount: BigNumber;
+  fromAccountId: string;
+  fromAmount: BigNumber;
   toFiat?: string;
-  feeStrategy: FeeStrategy;
+  feeStrategy?: FeeStrategy;
   rate?: number;
   customFeeConfig?: {
     [key: string]: BigNumber;
@@ -93,6 +93,13 @@ export type SellInfo = {
 
 export type FeeStrategy = "SLOW" | "MEDIUM" | "FAST" | "CUSTOM";
 
+enum FeeStrategyEnum {
+  SLOW = "SLOW",
+  MEDIUM = "MEDIUM",
+  FAST = "FAST",
+  CUSTOM = "CUSTOM",
+}
+
 // Should be available from the WalletAPI (zod :( )
 const ExchangeType = {
   FUND: "FUND",
@@ -335,9 +342,9 @@ export class ExchangeSDK {
     this.logger.log("*** Start Sell ***");
 
     const {
-      accountId,
-      amount: fromAmount,
-      feeStrategy,
+      fromAccountId,
+      fromAmount,
+      feeStrategy = FeeStrategyEnum.MEDIUM,
       customFeeConfig = {},
       quoteId,
       rate,
@@ -346,7 +353,7 @@ export class ExchangeSDK {
     } = info;
 
     const { account, currency } = await this.walletAPIDecorator
-      .retrieveUserAccount(accountId)
+      .retrieveUserAccount(fromAccountId)
       .catch((error: Error) => {
         this.handleError(error);
         throw error;
@@ -418,7 +425,7 @@ export class ExchangeSDK {
     const tx = await this.exchangeModule
       .completeSell({
         provider: this.providerId,
-        fromAccountId: accountId,
+        fromAccountId,
         transaction,
         binaryPayload: Buffer.from(binaryPayload),
         signature,