diff --git a/app/providers/__init__.py b/app/providers/__init__.py
index 709a001..dc83515 100644
--- a/app/providers/__init__.py
+++ b/app/providers/__init__.py
@@ -4,9 +4,11 @@ from __future__ import annotations
 
 from app.providers.base import BalanceProvider
 from app.providers.deepseek import DeepSeekProvider
+from app.providers.openrouter import OpenRouterProvider
 
 PROVIDERS: dict[str, type[BalanceProvider]] = {
     "deepseek": DeepSeekProvider,
+    "openrouter": OpenRouterProvider,
 }
 
 
diff --git a/app/providers/openrouter.py b/app/providers/openrouter.py
new file mode 100644
index 0000000..8ee5db4
--- /dev/null
+++ b/app/providers/openrouter.py
@@ -0,0 +1,29 @@
+"""OpenRouter 余额。
+
+接口：GET https://openrouter.ai/api/v1/credits
+响应：{"data": {"total_credits": 100.5, "total_usage": 25.75}}
+余额取剩余可用：total_credits - total_usage
+"""
+
+from __future__ import annotations
+
+from app.expr import evaluate_balance
+from app.providers.base import BalanceProvider
+
+
+class OpenRouterProvider(BalanceProvider):
+    id = "openrouter"
+    name = "OpenRouter"
+    currency = "USD"
+    icon = "OpenRouter"
+    description = "OpenRouter 余额（GET /api/v1/credits，Bearer 认证，剩余 = total_credits - total_usage）"
+
+    def build_request(self, api_key: str) -> tuple[str, dict, str | None]:
+        return (
+            "https://openrouter.ai/api/v1/credits",
+            {"Authorization": f"Bearer {api_key}"},
+            None,
+        )
+
+    def extract_balance(self, data: object) -> float:
+        return evaluate_balance(data, "data.total_credits - data.total_usage")
diff --git a/tests/test_providers.py b/tests/test_providers.py
index fc1a45e..427546b 100644
--- a/tests/test_providers.py
+++ b/tests/test_providers.py
@@ -5,6 +5,7 @@ import pytest
 from app.expr import ExprError
 from app.providers import get_provider, list_providers
 from app.providers.deepseek import DeepSeekProvider
+from app.providers.openrouter import OpenRouterProvider
 
 DEEPSEEK_RESPONSE = {
     "is_available": True,
@@ -36,10 +37,31 @@ class TestDeepSeek:
             DeepSeekProvider().extract_balance({"is_available": False})
 
 
+class TestOpenRouter:
+    def test_build_request(self):
+        prov = OpenRouterProvider()
+        url, headers, body = prov.build_request("sk-or-1")
+        assert url == "https://openrouter.ai/api/v1/credits"
+        assert headers["Authorization"] == "Bearer sk-or-1"
+        assert body is None
+
+    def test_extract_balance_remaining(self):
+        resp = {"data": {"total_credits": 100.5, "total_usage": 25.75}}
+        assert OpenRouterProvider().extract_balance(resp) == 74.75
+
+    def test_extract_zero_usage(self):
+        resp = {"data": {"total_credits": 10.0, "total_usage": 0}}
+        assert OpenRouterProvider().extract_balance(resp) == 10.0
+
+    def test_extract_missing(self):
+        with pytest.raises(ExprError):
+            OpenRouterProvider().extract_balance({"data": {}})
+
+
 class TestRegistry:
     def test_get_provider(self):
-        prov = get_provider("deepseek")
-        assert isinstance(prov, DeepSeekProvider)
+        assert isinstance(get_provider("deepseek"), DeepSeekProvider)
+        assert isinstance(get_provider("openrouter"), OpenRouterProvider)
 
     def test_unknown_provider_none(self):
         assert get_provider("nope") is None
@@ -47,6 +69,8 @@ class TestRegistry:
     def test_list_providers(self):
         provs = list_providers()
         ids = [p["id"] for p in provs]
-        assert "deepseek" in ids
+        assert "deepseek" in ids and "openrouter" in ids
         dp = next(p for p in provs if p["id"] == "deepseek")
         assert dp["name"] == "DeepSeek" and dp["currency"] == "CNY" and dp["icon"] == "DeepSeek"
+        orp = next(p for p in provs if p["id"] == "openrouter")
+        assert orp["currency"] == "USD" and orp["icon"] == "OpenRouter"