diff --git a/.changeset/salty-squids-repair.md b/.changeset/salty-squids-repair.md
new file mode 100644
index 00000000000..a7163a9d94d
--- /dev/null
+++ b/.changeset/salty-squids-repair.md
@@ -0,0 +1,6 @@
+---
+"@thirdweb-dev/engine": minor
+---
+
+Reworked Solana Sign Transaction API that accepts more flexible inputs
+
diff --git a/packages/engine/src/client/sdk.gen.ts b/packages/engine/src/client/sdk.gen.ts
index c0297a7fd7f..a10df7f1b2b 100644
--- a/packages/engine/src/client/sdk.gen.ts
+++ b/packages/engine/src/client/sdk.gen.ts
@@ -274,6 +274,33 @@ export const sendSolanaTransaction = <ThrowOnError extends boolean = false>(
 	});
 };
 
+/**
+ * Sign Solana Transaction
+ * Sign a Solana transaction without broadcasting it
+ */
+export const signSolanaTransaction = <ThrowOnError extends boolean = false>(
+	options: Options<SignSolanaTransactionData, ThrowOnError>,
+) => {
+	return (options.client ?? _heyApiClient).post<
+		SignSolanaTransactionResponses,
+		unknown,
+		ThrowOnError
+	>({
+		security: [
+			{
+				name: "x-secret-key",
+				type: "apiKey",
+			},
+		],
+		url: "/v1/solana/sign/transaction",
+		...options,
+		headers: {
+			"Content-Type": "application/json",
+			...options.headers,
+		},
+	});
+};
+
 /**
  * Cancel Transaction
  * Attempt to cancel a queued transaction. Transactions that have been sent and are waiting for mine cannot be cancelled.
@@ -424,33 +451,6 @@ export const signSolanaMessage = <ThrowOnError extends boolean = false>(
 	});
 };
 
-/**
- * Sign Solana Transaction
- * Sign a serialized Solana transaction.
- */
-export const signSolanaTransaction = <ThrowOnError extends boolean = false>(
-	options?: Options<SignSolanaTransactionData, ThrowOnError>,
-) => {
-	return (options?.client ?? _heyApiClient).post<
-		SignSolanaTransactionResponses,
-		unknown,
-		ThrowOnError
-	>({
-		security: [
-			{
-				name: "x-secret-key",
-				type: "apiKey",
-			},
-		],
-		url: "/v1/solana/sign-transaction",
-		...options,
-		headers: {
-			"Content-Type": "application/json",
-			...options?.headers,
-		},
-	});
-};
-
 /**
  * Get Transactions
  * Search transactions with various filters and pagination
diff --git a/packages/engine/src/client/types.gen.ts b/packages/engine/src/client/types.gen.ts
index 963cfabf2c4..a348a752cc3 100644
--- a/packages/engine/src/client/types.gen.ts
+++ b/packages/engine/src/client/types.gen.ts
@@ -556,6 +556,10 @@ export type Eip7702OwnerExecution = {
 	 * The delegated EOA address
 	 */
 	from: AddressDef;
+	/**
+	 * Optional fleet ID to route the transaction to a specific bundler fleet
+	 */
+	fleetId?: string | null;
 };
 
 /**
@@ -570,6 +574,10 @@ export type Eip7702SessionKeyExecution = {
 	 * The account address is the address of a delegated account you want to execute the transaction on. This account has granted a session key to the `session_key_address`
 	 */
 	accountAddress: AddressDef;
+	/**
+	 * Optional fleet ID to route the transaction to a specific bundler fleet
+	 */
+	fleetId?: string | null;
 };
 
 export type EmptyIdempotencySetResponse = {
@@ -1000,15 +1008,11 @@ export type RpcErrorResponse = {
 /**
  * Request to send a Solana transaction
  */
-export type SendSolanaTransactionRequest = {
+export type SendSolanaTransactionRequest = SolanaTransactionInput & {
 	/**
 	 * Idempotency key for this transaction (defaults to random UUID)
 	 */
 	idempotencyKey?: string;
-	/**
-	 * List of Solana instructions to execute
-	 */
-	instructions: Array<SolanaInstructionData>;
 	/**
 	 * Solana execution options
 	 */
@@ -1188,6 +1192,30 @@ export type SignResultData = {
 	signedData: string;
 };
 
+/**
+ * Request to sign a Solana transaction
+ */
+export type SignSolanaTransactionRequest = SolanaTransactionInput & {
+	/**
+	 * Solana execution options
+	 */
+	executionOptions: SolanaExecutionOptions;
+};
+
+/**
+ * Data returned from successful signing
+ */
+export type SignSolanaTransactionResponse = {
+	/**
+	 * The signature (base58-encoded)
+	 */
+	signature: string;
+	/**
+	 * The signed serialized transaction (base64-encoded)
+	 */
+	signedTransaction: string;
+};
+
 /**
  * Request to sign typed data
  */
@@ -1452,6 +1480,21 @@ export type SolanaRpcResponseErrorData =
 			type: "NODE_UNHEALTHY";
 	  };
 
+/**
+ * Input for Solana transaction - either build from instructions or use pre-built
+ */
+export type SolanaTransactionInput =
+	| SolanaTransactionInputInstructions
+	| SolanaTransactionInputSerialized;
+
+export type SolanaTransactionInputInstructions = {
+	instructions: Array<SolanaInstructionData>;
+};
+
+export type SolanaTransactionInputSerialized = {
+	transaction: string;
+};
+
 /**
  * Execution Option Variants
  * All supported specific execution options are contained here
@@ -1503,6 +1546,22 @@ export type SuccessResponseQueuedTransactionsResponse = {
 	};
 };
 
+export type SuccessResponseSignSolanaTransactionResponse = {
+	/**
+	 * Data returned from successful signing
+	 */
+	result: {
+		/**
+		 * The signature (base58-encoded)
+		 */
+		signature: string;
+		/**
+		 * The signed serialized transaction (base64-encoded)
+		 */
+		signedTransaction: string;
+	};
+};
+
 export type ThirdwebError =
 	| {
 			error: ThirdwebSerializationError;
@@ -1847,6 +1906,32 @@ export type SendSolanaTransactionResponses = {
 export type SendSolanaTransactionResponse =
 	SendSolanaTransactionResponses[keyof SendSolanaTransactionResponses];
 
+export type SignSolanaTransactionData = {
+	/**
+	 * Sign Solana transaction request
+	 */
+	body: SignSolanaTransactionRequest;
+	headers?: {
+		/**
+		 * Vault access token
+		 */
+		"x-vault-access-token"?: string | null;
+	};
+	path?: never;
+	query?: never;
+	url: "/v1/solana/sign/transaction";
+};
+
+export type SignSolanaTransactionResponses = {
+	/**
+	 * Successfully signed Solana transaction
+	 */
+	200: SuccessResponseSignSolanaTransactionResponse;
+};
+
+export type SignSolanaTransactionResponse2 =
+	SignSolanaTransactionResponses[keyof SignSolanaTransactionResponses];
+
 export type CancelTransactionData = {
 	body?: never;
 	path: {
@@ -2076,49 +2161,6 @@ export type SignSolanaMessageResponses = {
 export type SignSolanaMessageResponse =
 	SignSolanaMessageResponses[keyof SignSolanaMessageResponses];
 
-export type SignSolanaTransactionData = {
-	body?: {
-		/**
-		 * Base58 encoded Solana public key
-		 */
-		from: string;
-		/**
-		 * Base64 encoded Solana transaction
-		 */
-		transaction: string;
-	};
-	headers?: {
-		/**
-		 * Vault Access Token used to access your EOA
-		 */
-		"x-vault-access-token"?: string;
-	};
-	path?: never;
-	query?: never;
-	url: "/v1/solana/sign-transaction";
-};
-
-export type SignSolanaTransactionResponses = {
-	/**
-	 * Transaction signed
-	 */
-	200: {
-		result: {
-			/**
-			 * Base58 encoded signature
-			 */
-			signature: string;
-			/**
-			 * Base58 encoded Solana public key
-			 */
-			signerPublicKey: string;
-		};
-	};
-};
-
-export type SignSolanaTransactionResponse =
-	SignSolanaTransactionResponses[keyof SignSolanaTransactionResponses];
-
 export type GetTransactionsData = {
 	body?: never;
 	path?: never;