diff --git a/.changeset/happy-areas-spend.md b/.changeset/happy-areas-spend.md
new file mode 100644
index 0000000..133cd0a
--- /dev/null
+++ b/.changeset/happy-areas-spend.md
@@ -0,0 +1,6 @@
+---
+"@macalinao/gill-extra": patch
+"@macalinao/grill": patch
+---
+
+Add parseTransactionError, new error type
diff --git a/.changeset/silent-suits-return.md b/.changeset/silent-suits-return.md
new file mode 100644
index 0000000..d2d748f
--- /dev/null
+++ b/.changeset/silent-suits-return.md
@@ -0,0 +1,6 @@
+---
+"@macalinao/gill-extra": minor
+"@macalinao/grill": minor
+---
+
+Change compute unit stuff to be not included by default
diff --git a/packages/gill-extra/src/index.ts b/packages/gill-extra/src/index.ts
index 6422270..e37fc51 100644
--- a/packages/gill-extra/src/index.ts
+++ b/packages/gill-extra/src/index.ts
@@ -13,4 +13,5 @@ export * from "./get-solscan-explorer-link.js";
 export * from "./ixs/index.js";
 export * from "./poll-confirm-transaction.js";
 export * from "./transaction.js";
+export * from "./transaction-error.js";
 export * from "./types.js";
diff --git a/packages/gill-extra/src/transaction-error.ts b/packages/gill-extra/src/transaction-error.ts
new file mode 100644
index 0000000..e7d19dd
--- /dev/null
+++ b/packages/gill-extra/src/transaction-error.ts
@@ -0,0 +1,22 @@
+import type { TransactionError } from "@solana/kit";
+import { getSolanaErrorFromTransactionError } from "@solana/kit";
+
+export const parseTransactionError = (
+  err: TransactionError,
+  logs: string[] | null,
+): string => {
+  // First, try to extract Anchor error from logs
+  const anchorError = [...(logs ?? [])]
+    .reverse()
+    .find((log) => log.includes("AnchorError"));
+
+  if (anchorError) {
+    const errorMessageStart = anchorError.indexOf("Error Message: ");
+    if (errorMessageStart !== -1) {
+      return anchorError.slice(errorMessageStart + 15).trim();
+    }
+  }
+
+  const solanaError = getSolanaErrorFromTransactionError(err);
+  return solanaError.message;
+};
diff --git a/packages/gill-extra/src/types.ts b/packages/gill-extra/src/types.ts
index 6e8f552..acf02d4 100644
--- a/packages/gill-extra/src/types.ts
+++ b/packages/gill-extra/src/types.ts
@@ -4,21 +4,17 @@ import type {
   Instruction,
   Signature,
 } from "@solana/kit";
+import type { CreateTransactionInput } from "gill";
 
-export interface SendTXOptions {
-  lookupTables?: AddressesByLookupTableAddress;
-  /**
-   * Compute unit limit for the transaction.
-   * Set to null to omit compute unit limit instruction.
-   * Defaults to 1,400,000 if not specified.
-   */
-  computeUnitLimit?: number | null;
+export interface SendTXOptions
+  extends Pick<
+    CreateTransactionInput<0>,
+    "computeUnitLimit" | "computeUnitPrice"
+  > {
   /**
-   * Compute unit price for the transaction in microlamports.
-   * Set to null to omit compute unit price instruction.
-   * Defaults to 100,000 if not specified.
+   * Address lookup tables (optional)
    */
-  computeUnitPrice?: bigint | null;
+  lookupTables?: AddressesByLookupTableAddress;
   /**
    * Whether to wait for account refetch after transaction confirmation.
    * When true (default), the function will wait for all writable accounts
@@ -28,6 +24,10 @@ export interface SendTXOptions {
    * @default true
    */
   waitForAccountRefetch?: boolean;
+  /**
+   * If true, skips the pre-flight simulation.
+   */
+  skipPreflight?: boolean;
 }
 
 export type SendTXFunction = (
diff --git a/packages/grill/src/providers/grill-provider.tsx b/packages/grill/src/providers/grill-provider.tsx
index 71c766e..d6d4378 100644
--- a/packages/grill/src/providers/grill-provider.tsx
+++ b/packages/grill/src/providers/grill-provider.tsx
@@ -207,6 +207,27 @@ export const GrillProvider: FC<GrillProviderProps> = ({
           toastIds.current.delete(txId);
           break;
         }
+        case "error-simulation-failed": {
+          console.error("Simulation failed", event);
+          const description = `Simulation failed: ${event.errorMessage}`;
+          if (existingToastId) {
+            // Update existing toast to error
+            toast.error(event.title, {
+              id: existingToastId,
+              description,
+              duration: errorToastDuration,
+            });
+          } else {
+            // Create new error toast if somehow we don't have one
+            toast.error(event.title, {
+              description,
+              duration: errorToastDuration,
+            });
+          }
+          // Clean up toast ID after error
+          toastIds.current.delete(txId);
+          break;
+        }
       }
     },
     [
diff --git a/packages/grill/src/types.ts b/packages/grill/src/types.ts
index b7f072a..4bb7ad7 100644
--- a/packages/grill/src/types.ts
+++ b/packages/grill/src/types.ts
@@ -35,6 +35,10 @@ export type TransactionStatusEvent = {
       sig: Signature;
       explorerLink: string;
     }
+  | {
+      type: "error-simulation-failed";
+      errorMessage: string;
+    }
 );
 
 export type TransactionStatusEventCallback = (
diff --git a/packages/grill/src/utils/internal/create-send-tx.ts b/packages/grill/src/utils/internal/create-send-tx.ts
index a198d54..155ae4e 100644
--- a/packages/grill/src/utils/internal/create-send-tx.ts
+++ b/packages/grill/src/utils/internal/create-send-tx.ts
@@ -14,13 +14,15 @@ import type { SolanaClient } from "gill";
 import type { TransactionStatusEvent } from "../../types.js";
 import {
   getSignatureFromBytes,
+  parseTransactionError,
   pollConfirmTransaction,
 } from "@macalinao/gill-extra";
 import {
   compressTransactionMessageUsingAddressLookupTables,
+  getSolanaErrorFromTransactionError,
   signAndSendTransactionMessageWithSigners,
 } from "@solana/kit";
-import { createTransaction } from "gill";
+import { createTransaction, simulateTransactionFactory } from "gill";
 
 export interface CreateSendTXParams {
   signer: TransactionSendingSigner | null;
@@ -41,6 +43,7 @@ export const createSendTX = ({
   onTransactionStatusEvent,
   getExplorerLink,
 }: CreateSendTXParams): SendTXFunction => {
+  const simulateTransaction = simulateTransactionFactory({ rpc });
   return async (
     name: string,
     ixs: readonly Instruction[],
@@ -70,15 +73,8 @@ export const createSendTX = ({
       feePayer: signer,
       instructions: [...ixs],
       latestBlockhash,
-      // the compute budget values are HIGHLY recommend to be set in order to maximize your transaction landing rate
-      computeUnitLimit:
-        options.computeUnitLimit === null
-          ? undefined
-          : (options.computeUnitLimit ?? 1_400_000),
-      computeUnitPrice:
-        options.computeUnitPrice === null
-          ? undefined
-          : (options.computeUnitPrice ?? 100_000n),
+      computeUnitLimit: options.computeUnitLimit,
+      computeUnitPrice: options.computeUnitPrice,
     });
 
     // Apply address lookup tables if provided to compress the transaction
@@ -91,6 +87,24 @@ export const createSendTX = ({
           )
         : transactionMessage;
 
+    // preflight
+    if (!options.skipPreflight) {
+      const simulationResult = await simulateTransaction(
+        finalTransactionMessage,
+      );
+      if (simulationResult.value.err) {
+        onTransactionStatusEvent({
+          ...baseEvent,
+          type: "error-simulation-failed",
+          errorMessage: parseTransactionError(
+            simulationResult.value.err,
+            simulationResult.value.logs,
+          ),
+        });
+        throw getSolanaErrorFromTransactionError(simulationResult.value.err);
+      }
+    }
+
     onTransactionStatusEvent({
       ...baseEvent,
       type: "awaiting-wallet-signature",