diff --git a/openpype/hosts/traypublisher/api/__init__.py b/openpype/hosts/traypublisher/api/__init__.py
new file mode 100644
index 0000000000..c461c0c526
--- /dev/null
+++ b/openpype/hosts/traypublisher/api/__init__.py
@@ -0,0 +1,20 @@
+from .pipeline import (
+    install,
+    ls,
+
+    set_project_name,
+    get_context_title,
+    get_context_data,
+    update_context_data,
+)
+
+
+__all__ = (
+    "install",
+    "ls",
+
+    "set_project_name",
+    "get_context_title",
+    "get_context_data",
+    "update_context_data",
+)
diff --git a/openpype/hosts/traypublisher/api/pipeline.py b/openpype/hosts/traypublisher/api/pipeline.py
new file mode 100644
index 0000000000..83fe326ca4
--- /dev/null
+++ b/openpype/hosts/traypublisher/api/pipeline.py
@@ -0,0 +1,181 @@
+import os
+import json
+import tempfile
+import atexit
+
+import avalon.api
+import pyblish.api
+
+from openpype.pipeline import BaseCreator
+
+ROOT_DIR = os.path.dirname(os.path.dirname(
+    os.path.abspath(__file__)
+))
+PUBLISH_PATH = os.path.join(ROOT_DIR, "plugins", "publish")
+CREATE_PATH = os.path.join(ROOT_DIR, "plugins", "create")
+
+
+class HostContext:
+    _context_json_path = None
+
+    @staticmethod
+    def _on_exit():
+        if (
+            HostContext._context_json_path
+            and os.path.exists(HostContext._context_json_path)
+        ):
+            os.remove(HostContext._context_json_path)
+
+    @classmethod
+    def get_context_json_path(cls):
+        if cls._context_json_path is None:
+            output_file = tempfile.NamedTemporaryFile(
+                mode="w", prefix="traypub_", suffix=".json"
+            )
+            output_file.close()
+            cls._context_json_path = output_file.name
+            atexit.register(HostContext._on_exit)
+            print(cls._context_json_path)
+        return cls._context_json_path
+
+    @classmethod
+    def _get_data(cls, group=None):
+        json_path = cls.get_context_json_path()
+        data = {}
+        if not os.path.exists(json_path):
+            with open(json_path, "w") as json_stream:
+                json.dump(data, json_stream)
+        else:
+            with open(json_path, "r") as json_stream:
+                content = json_stream.read()
+            if content:
+                data = json.loads(content)
+        if group is None:
+            return data
+        return data.get(group)
+
+    @classmethod
+    def _save_data(cls, group, new_data):
+        json_path = cls.get_context_json_path()
+        data = cls._get_data()
+        data[group] = new_data
+        with open(json_path, "w") as json_stream:
+            json.dump(data, json_stream)
+
+    @classmethod
+    def add_instance(cls, instance):
+        instances = cls.get_instances()
+        instances.append(instance)
+        cls.save_instances(instances)
+
+    @classmethod
+    def get_instances(cls):
+        return cls._get_data("instances") or []
+
+    @classmethod
+    def save_instances(cls, instances):
+        cls._save_data("instances", instances)
+
+    @classmethod
+    def get_context_data(cls):
+        return cls._get_data("context") or {}
+
+    @classmethod
+    def save_context_data(cls, data):
+        cls._save_data("context", data)
+
+    @classmethod
+    def get_project_name(cls):
+        return cls._get_data("project_name")
+
+    @classmethod
+    def set_project_name(cls, project_name):
+        cls._save_data("project_name", project_name)
+
+    @classmethod
+    def get_data_to_store(cls):
+        return {
+            "project_name": cls.get_project_name(),
+            "instances": cls.get_instances(),
+            "context": cls.get_context_data(),
+        }
+
+
+def list_instances():
+    return HostContext.get_instances()
+
+
+def update_instances(update_list):
+    updated_instances = {}
+    for instance, _changes in update_list:
+        updated_instances[instance.id] = instance.data_to_store()
+
+    instances = HostContext.get_instances()
+    for instance_data in instances:
+        instance_id = instance_data["instance_id"]
+        if instance_id in updated_instances:
+            new_instance_data = updated_instances[instance_id]
+            old_keys = set(instance_data.keys())
+            new_keys = set(new_instance_data.keys())
+            instance_data.update(new_instance_data)
+            for key in (old_keys - new_keys):
+                instance_data.pop(key)
+
+    HostContext.save_instances(instances)
+
+
+def remove_instances(instances):
+    if not isinstance(instances, (tuple, list)):
+        instances = [instances]
+
+    current_instances = HostContext.get_instances()
+    for instance in instances:
+        instance_id = instance.data["instance_id"]
+        found_idx = None
+        for idx, _instance in enumerate(current_instances):
+            if instance_id == _instance["instance_id"]:
+                found_idx = idx
+                break
+
+        if found_idx is not None:
+            current_instances.pop(found_idx)
+    HostContext.save_instances(current_instances)
+
+
+def get_context_data():
+    return HostContext.get_context_data()
+
+
+def update_context_data(data, changes):
+    HostContext.save_context_data(data)
+
+
+def get_context_title():
+    return HostContext.get_project_name()
+
+
+def ls():
+    """Probably will never return loaded containers."""
+    return []
+
+
+def install():
+    """This is called before a project is known.
+
+    Project is defined with 'set_project_name'.
+    """
+    os.environ["AVALON_APP"] = "traypublisher"
+
+    pyblish.api.register_host("traypublisher")
+    pyblish.api.register_plugin_path(PUBLISH_PATH)
+    avalon.api.register_plugin_path(BaseCreator, CREATE_PATH)
+
+
+def set_project_name(project_name):
+    # Deregister project specific plugins and register new project plugins
+    old_project_name = HostContext.get_project_name()
+    if old_project_name is not None and old_project_name != project_name:
+        pass
+    os.environ["AVALON_PROJECT"] = project_name
+    avalon.api.Session["AVALON_PROJECT"] = project_name
+    HostContext.set_project_name(project_name)