add endpoint

src/main/java/org/qortal/api/resource/AtResource.java

@@ -27,6 +27,7 @@ import org.qortal.api.ApiException;
 import org.qortal.api.ApiExceptionFactory;
 import org.qortal.data.at.ATData;
 import org.qortal.data.at.ATStateData;
+import org.qortal.data.transaction.CreationRequest;
 import org.qortal.data.transaction.DeployAtTransactionData;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
@@ -156,6 +157,41 @@ public class AtResource {
 		}
 	}
 
+	@POST
+	@Path("/createMachineState")
+	@Operation(
+			summary = "Create MachineState bytes from the provided parameters",
+			requestBody = @RequestBody(
+					required = true,
+					content = @Content(
+							mediaType = MediaType.APPLICATION_JSON,
+							schema = @Schema(
+									implementation = CreationRequest.class
+							)
+					)
+			),
+			responses = {
+					@ApiResponse(
+							description = "MachineState bytes",
+							content = @Content(
+									mediaType = MediaType.TEXT_PLAIN,
+									schema = @Schema(
+											type = "string"
+									)
+							)
+					)
+			}
+	)
+	public byte[] createMachineState(CreationRequest request) {
+		return MachineState.toCreationBytes(
+				request.getCiyamAtVersion(),
+				request.getCodeBytes(),
+				request.getDataBytes(),
+				request.getNumCallStackPages(),
+				request.getNumUserStackPages(),
+				request.getMinActivationAmount()
+		);
+	}
 	@POST
 	@Operation(
 		summary = "Build raw, unsigned, DEPLOY_AT transaction",

src/main/java/org/qortal/data/transaction/CreationRequest.java

@@ -0,0 +1,63 @@
+package org.qortal.data.transaction;
+
+public class CreationRequest  {
+
+    private short ciyamAtVersion;
+    private byte[] codeBytes;
+    private byte[] dataBytes;
+    private short numCallStackPages;
+    private short numUserStackPages;
+    private long minActivationAmount;
+
+    // Default constructor for JSON deserialization
+    public CreationRequest() {}
+
+    // Getters and setters
+    public short getCiyamAtVersion() {
+        return ciyamAtVersion;
+    }
+
+    public void setCiyamAtVersion(short ciyamAtVersion) {
+        this.ciyamAtVersion = ciyamAtVersion;
+    }
+
+    public byte[] getCodeBytes() {
+        return codeBytes;
+    }
+
+    public void setCodeBytes(byte[] codeBytes) {
+        this.codeBytes = codeBytes;
+    }
+
+    public byte[] getDataBytes() {
+        return dataBytes;
+    }
+
+    public void setDataBytes(byte[] dataBytes) {
+        this.dataBytes = dataBytes;
+    }
+
+    public short getNumCallStackPages() {
+        return numCallStackPages;
+    }
+
+    public void setNumCallStackPages(short numCallStackPages) {
+        this.numCallStackPages = numCallStackPages;
+    }
+
+    public short getNumUserStackPages() {
+        return numUserStackPages;
+    }
+
+    public void setNumUserStackPages(short numUserStackPages) {
+        this.numUserStackPages = numUserStackPages;
+    }
+
+    public long getMinActivationAmount() {
+        return minActivationAmount;
+    }
+
+    public void setMinActivationAmount(long minActivationAmount) {
+        this.minActivationAmount = minActivationAmount;
+    }
+}