diff --git a/espec.yml b/espec.yml
deleted file mode 100644
index 90f96f5..0000000
--- a/espec.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-openapi: 3.0.0
-info:
-  title: Python to .Net
-  description: Still whitout description.
-  version: 0.25.1
-servers:
-- url: http://www.skycoin.net
-  description: Main Skycoin server
-- url: http://staging.node.skycoin.net
-  description: Internal staging server for developer.
-components:
-  securitySchemes:
-    CsrfTokenAuth:        # arbitrary name for the security scheme
-      type: apiKey
-      in: header       # can be "header", "query" or "cookie"
-      name: X-CSRF-TOKEN  # name of the header, query parameter or cookie
-  schemas:
-    genericError:
-      description: This is a generic error that should be default response
-      type: object
-      properties:
-        code:
-          type: integer
-          format: int64
-        message:
-          type: string
-paths:
\ No newline at end of file
diff --git a/spec.yml b/spec.yml
new file mode 100644
index 0000000..dccdb32
--- /dev/null
+++ b/spec.yml
@@ -0,0 +1,154 @@
+openapi: 3.0.0
+info:
+  title: Python to .Net
+  description: Still whitout description.
+  version: 0.25.1
+servers:
+- url: http://www.skycoin.net
+  description: Main Skycoin server
+- url: http://staging.node.skycoin.net
+  description: Internal staging server for developer.
+components:
+  securitySchemes:
+    CsrfTokenAuth:        # arbitrary name for the security scheme
+      type: apiKey
+      in: header       # can be "header", "query" or "cookie"
+      name: X-CSRF-TOKEN  # name of the header, query parameter or cookie
+  schemas:
+    genericError:
+      description: This is a generic error that should be default response
+      type: object
+      properties:
+        code:
+          type: integer
+          format: int64
+        message:
+          type: string
+paths:
+  /api/transactions/broadcast:
+    post:
+      summary: Broadcast the signed transaction.
+      description: Should broadcast the signed transaction. Result code can be evaluated synchronously or returned asynchronously in the `[GET] /api/transactions/broadcast/*` response with error code.
+      security: 
+      - CsrfTokenAuth: []
+
+      requestBody:
+        description: 'A JSON object containing: Operation ID. The signed transaction returned by the [POST] /api/sign'
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                operationId:
+                  type: string
+                  description: Operation ID.
+                signedTransaction:
+                  type: string
+                  description: The signed transaction returned by the [POST] /api/sign.
+
+      responses:
+        '200': # status code
+          description: Error code.
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  errorCode:
+                    type: string
+                    enum:
+                    - amountIsTooSmall
+                    - notEnoughBalance
+                    description: Error code. Can be empty. Should be non empty if an error that match one of the listed code is occured. For other errors use HTTP status codes.
+        default:
+          $ref : '#/components/schemas/genericError'
+
+  /api/addresses/{address}/explorer-url:
+    get:
+      summary: Return one or many blockchain explorer URLs.
+      description: Should return one or many blockchain explorer URLs for the given address.
+      security: 
+      - CsrfTokenAuth: []
+
+      parameters: 
+      - name: address
+        in: path
+        description: Address for find blockchain explorer URLs.
+        required: true
+        schema:
+          type: string
+
+      responses:
+        '200':
+          description: Blockchain explorer URLs for the given address.
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  type: string
+        default:
+          $ref : '#/components/schemas/genericError'
+
+  /api/transactions/many-outputs:
+    post:
+      summary: Build not signed transaction with many outputs.
+      description: Should build not signed transaction with many outputs. If the transaction with the specified `operationId` has already been built by one of the `[POST] /api/transactions/*` call, it should be ignored and regular response (as in the first request) should be returned. Fee should be added to the specified amount.
+      security: 
+      - CsrfTokenAuth: []
+
+      requestBody:
+        description: 'A JSON object containing: Operation ID. Source address. Destinations. Asset ID to transfer, defaults to SKY'
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                operationId:
+                  type: string
+                  description: Operation ID.
+                fromAddress:
+                  type: string
+                  description: Source address.
+                outputs:
+                  type: array
+                  items:
+                    type: object
+                    properties:
+                      toAddress:
+                        type: string
+                        description: Destination address.
+                      amount:
+                        type: string
+                        description: Amount to transfer to the  toAddress. Integer as string, aligned to the asset accuracy. Actual value can be calculated as x = amount / (10 ^ asset.Accuracy).
+                  description: Destinations.
+                assetId:
+                  type: string
+                  description: Asset ID to transfer, defaults to SKY.
+
+      responses:
+        '200': # status code
+          description: Error code. The transaction context
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  errorCode:
+                    type: string
+                    enum:
+                    - amountIsTooSmall
+                    - notEnoughBalance
+                    description: Error code. Can be empty. Should be non empty if an error that match one of the listed code is occured. For other errors use HTTP status codes.
+                  transactionContext:
+                    type: string
+                    description: The transaction context in the blockchain specific format, which will be passed to the [POST] /api/sign. Should be not empty when result is successful.
+        default:
+          $ref : '#/components/schemas/genericError'
+
+# To remember :
+#  Every post method should use security schema.
+#  Feel free to use and reuse components
+#  I think, at some point, someone should use oneOf and anyOf, pls take a look