diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..082b194
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "makefile.configureOnOpen": false
+}
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..fef73c5
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+generate-ogen:
+	go run github.com/ogen-go/ogen/cmd/ogen@latest --target pkg/rest -package gsn --clean api/rest/predictor.swagger.yml
\ No newline at end of file
diff --git a/api/rest/predictor.swagger.yml b/api/rest/predictor.swagger.yml
new file mode 100644
index 0000000..f6a8feb
--- /dev/null
+++ b/api/rest/predictor.swagger.yml
@@ -0,0 +1,71 @@
+openapi: 3.0.4
+info:
+  title: GSN Predictor - OpenAPI 3.0
+  version: 0.0.1
+paths:
+  /api/v1/prediction:
+    post:
+      tags:
+        - Prediction
+      summary: Perform preidction
+      operationId: performPrediction
+      parameters:
+        - in: query
+          name: parameters
+          required: false
+          schema:
+            $ref: '#/components/schemas/Prediction/Parameters'
+          style: form
+          explode: true
+      requestBody:
+        required: false
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Prediction/Parameters'
+
+components:
+  schemas:
+    Prediction:
+      Parameters: 
+        type: object
+        properties:
+          launch_latitude: # TODO: altitude not required with fallback to https://github.com/priyeshpatel/ruaumoko Go analog
+            type: number
+          launch_longitude:
+            type: number
+          launch_datetime:
+            type: string
+            format: date-time
+          launch_altitude:
+            type: number
+          profile:
+            type: string
+            enum: ["standard_profile", "float_profile", "reverse_profile", "custom_profile"]
+          ascent_rate:
+            type: number
+          burst_altitude:
+            type: number
+          descent_rate:
+            type: number
+          float_altitude:
+            type: number
+          stop_datetime:
+            type: string
+            format: date-time
+          ascent_curve:
+            type: string
+            description: "Base64 encoded ascent curve"
+          descent_curve:
+            type: string
+            description: "Base64 encoded descent curve"
+          interpolate:
+            type: boolean
+            default: false
+          format: # TODO: custom output format (csv, kml) with json as default 
+            type: string
+            enum: ["json"]
+            default: json
+          dataset:
+            type: string
+            format: date-time
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..af3a3ba
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.intra.yksa.space/gsn/predictor
+
+go 1.24.4