diff --git a/src/selectel_ml_tui/api/billing.py b/src/selectel_ml_tui/api/billing.py
new file mode 100644
index 0000000..0280e46
--- /dev/null
+++ b/src/selectel_ml_tui/api/billing.py
@@ -0,0 +1,132 @@
+"""Клиент Billing Statistics API Selectel (провайдер aig).
+
+Аутентификация: статический токен в заголовке X-Token.
+Данные: стоимость потребления ИИ-роутера по дням/часам.
+"""
+
+from __future__ import annotations
+
+from decimal import Decimal
+from typing import Any, cast
+
+import httpx
+
+from selectel_ml_tui.api.client import BaseApiClient, SelectelApiError
+from selectel_ml_tui.models import ConsumptionItem
+
+BillingApiError = SelectelApiError
+
+
+def normalize_dt(value: str) -> str:
+    """Привести дату к формату, принимаемому Billing API.
+
+    Billing API ожидает полный ISO-таймстамп (например
+    ``2026-08-01T00:00:00.000``); короткая дата дополняется.
+    """
+    if "T" in value:
+        return value
+    return f"{value}T00:00:00.000"
+
+
+class BillingClient(BaseApiClient):
+    """Клиент /v1/cloud_billing/statistic/* для провайдера aig."""
+
+    PROVIDER = "aig"
+
+    def __init__(
+        self,
+        api_base_url: str,
+        static_token: str,
+        timeout: float = 30.0,
+        max_retries: int = 2,
+        transport: httpx.AsyncBaseTransport | None = None,
+        sleep: Any = None,
+    ) -> None:
+        super().__init__(
+            timeout=timeout,
+            max_retries=max_retries,
+            transport=transport,
+            sleep=sleep,
+        )
+        self._base_url = api_base_url.rstrip("/")
+        self._token = static_token
+
+    def _headers(self) -> dict[str, str]:
+        return {"X-Token": self._token, "Content-Type": "application/json"}
+
+    async def _get(
+        self, path: str, params: dict[str, str] | None = None
+    ) -> dict[str, Any]:
+        url = f"{self._base_url}{path}"
+        response = await self.request(
+            "GET", url, params=params, headers=self._headers()
+        )
+        data = response.json()
+        if not isinstance(data, dict) or data.get("status") != "success":
+            raise BillingApiError(f"Billing API: {data}")
+        return data
+
+    async def get_consumption(
+        self,
+        start: str,
+        end: str,
+        locale: str = "ru",
+        group_type: str = "metric",
+        period_group_type: str = "day",
+    ) -> list[ConsumptionItem]:
+        """Получить потребление за период.
+
+        group_type: project | object | metric | project_metric | region_metric
+        period_group_type: hour | day | week | month | year | all
+        """
+        data = await self._get(
+            "/v1/cloud_billing/statistic/consumption",
+            params={
+                "provider_keys": self.PROVIDER,
+                "start": normalize_dt(start),
+                "end": normalize_dt(end),
+                "locale": locale,
+                "group_type": group_type,
+                "period_group_type": period_group_type,
+            },
+        )
+        return [ConsumptionItem.model_validate(item) for item in data.get("data", [])]
+
+    async def get_consumption_history(
+        self,
+        start: str,
+        end: str,
+        group: str = "day",
+    ) -> list[ConsumptionItem]:
+        """История потребления по дням/часам за период.
+
+        group: hour | day | week | month | year | all
+        """
+        return await self.get_consumption(
+            start, end, period_group_type=group, group_type="metric"
+        )
+
+    async def get_summary(
+        self,
+        start: str,
+        end: str,
+        group_type: str = "metric",
+        period_group_type: str = "month",
+    ) -> Decimal:
+        """Суммарная стоимость за период в копейках (value)."""
+        data = await self._get(
+            "/v1/cloud_billing/statistic/summary_stats",
+            params={
+                "provider_keys": self.PROVIDER,
+                "start": normalize_dt(start),
+                "end": normalize_dt(end),
+                "group_type": group_type,
+                "period_group_type": period_group_type,
+                "items_count_period_group_type": "all",
+            },
+        )
+        rows = data.get("data", [])
+        total: Decimal = Decimal("0")
+        for row in cast(list[dict[str, Any]], rows):
+            total += Decimal(str(row.get("value", 0)))
+        return total