diff --git a/api-spec.yaml b/api-spec.yaml
index b10cfe2..ba15f85 100644
--- a/api-spec.yaml
+++ b/api-spec.yaml
@@ -6,16 +6,20 @@ info:
 servers:
   - url: 'http://localhost:8080'
 tags:
-  - name: Database
-    description: IPD-IMGT/HLA DB Information
   - name: ARD Reduction
     description: Reduce GL String to ARD
+  - name: CWD Reduction
+    description: Reduce GL String to CWD (version 2)
   - name: MAC
     description: Expand/Collapse MAC to/from alleles
-  - name: DRBX Blender
-    description: Blend DRBX based on DRB1 and DRB3/4/5
   - name: Validation
     description: Validate a GL String or Allele
+  - name: DRBX Blender
+    description: Blend DRBX based on DRB1 and DRB3/4/5
+  - name: Broad Splits
+    description: Broad Split Mappings
+  - name: Database
+    description: IPD-IMGT/HLA DB Information
 paths:
   /version:
     get:
@@ -462,10 +466,58 @@ paths:
             Broad/Split mapping not found for the given allele
           content:
             application/json:
-                schema:
-                  type: object
-                  properties:
-                    message:
-                      description: Mapping not found
-                      type: string
-                      example: "Broad/Split not found"
+              schema:
+                type: object
+                properties:
+                  message:
+                    description: Mapping not found
+                    type: string
+                    example: "Broad/Split not found"
+  /similar/{allele_prefix}:
+    get:
+      tags:
+        - Database
+      operationId: api.similar_controller
+      summary: Search For Similar Alleles and MACs
+      description: |
+        Given a prefix of an allele or MAC, find all the alleles
+        beginning with the prefix.
+      parameters:
+        - name: allele_prefix
+          in: path
+          description: |
+            Prefix of an Allele/MAC with a minimum of locus and a first field
+          required: true
+          schema:
+            type: string
+          example: A*01:9
+      responses:
+        200:
+          description: List of alleles with the given prefix
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  example:
+                    - A*01:91
+                    - A*01:92
+                    - A*01:93
+                    - A*01:94
+                    - A*01:95
+                    - A*01:96
+                    - A*01:97
+                    - A*01:98
+                    - A*01:99
+        404:
+          description: |
+            No matching alleles or MACs found
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  message:
+                    description: No similar alleles
+                    type: string
+                    example: "No similar alleles"
diff --git a/api.py b/api.py
index d93fc8d..c09d737 100644
--- a/api.py
+++ b/api.py
@@ -143,3 +143,12 @@ def cwd_redux_controller():
 
     # if no data is sent
     return {"message": "No input data provided"}, 404
+
+
+def similar_controller(allele_prefix: str):
+    if allele_prefix:
+        alleles = ard.similar_alleles(allele_prefix)
+        if alleles:
+            return alleles, 200
+        return {"message": "No similar alleles found."}, 400
+    return {"message": "No input data provided"}, 404
diff --git a/requirements-deploy.txt b/requirements-deploy.txt
index 0e1ec03..0095330 100644
--- a/requirements-deploy.txt
+++ b/requirements-deploy.txt
@@ -1,2 +1,2 @@
-connexion[swagger-ui]==2.13.0
+connexion[swagger-ui, flask]==2.14.2
 gunicorn==20.1.0
diff --git a/scripts/pyard b/scripts/pyard
index 9d25e23..630d212 100755
--- a/scripts/pyard
+++ b/scripts/pyard
@@ -45,7 +45,6 @@ def find_similar_alleles(prefix):
 
 
 def lookup_mac_codes():
-    global e
     try:
         mac = ard.lookup_mac(args.lookup_mac)
         print(mac)
@@ -55,7 +54,6 @@ def lookup_mac_codes():
 
 
 def expand_mac_code():
-    global allele_list, e
     try:
         allele_list = ard.expand_mac(args.expand_mac)
         print(allele_list)
@@ -79,7 +77,6 @@ def show_version():
 
 
 def perform_cwd_redux():
-    global cwd_redux
     if args.validate:
         ard.validate(args.cwd)
     cwd_redux = ard.cwd_redux(args.cwd)