diff --git a/README.md b/README.md
index 22c658b..9267c1f 100644
--- a/README.md
+++ b/README.md
@@ -169,6 +169,8 @@ ws = NewsDataApiWebSocket(
 ```python
 from newsdataapi import (
     NewsdataAPIError,
+    NewsdataApiKeyLimitExceededError,
+    NewsdataApiLimitExceededError,
     NewsdataAuthError,
     NewsdataNetworkError,
     NewsdataRateLimitError,
@@ -178,6 +180,10 @@ try:
     client.latest_api(q="news")
 except NewsdataAuthError as e:
     print(f"bad API key (HTTP {e.status_code})")
+except NewsdataApiKeyLimitExceededError:
+    print("this API key's own credit cap is exhausted")
+except NewsdataApiLimitExceededError:
+    print("account credit pool is exhausted")
 except NewsdataRateLimitError as e:
     print(f"rate limited; retry after {e.retry_after}s")
 except NewsdataAPIError as e:
@@ -190,18 +196,24 @@ The full hierarchy:
 
 ```
 NewsdataException
-├── NewsdataValidationError      (also a ValueError; carries .param)
-├── NewsdataAPIError             (carries .status_code, .response_body)
-│   ├── NewsdataAuthError        (401 / 403)
-│   ├── NewsdataRateLimitError   (429; carries .retry_after)
-│   └── NewsdataServerError      (5xx)
-├── NewsdataNetworkError         (carries .original)
-└── NewsdataWebSocketError       (real-time stream)
+├── NewsdataValidationError              (also a ValueError; carries .param)
+├── NewsdataAPIError                     (carries .status_code, .response_body)
+│   ├── NewsdataAuthError                (401 / 403)
+│   ├── NewsdataRateLimitError           (429; carries .retry_after)
+│   │   ├── NewsdataApiLimitExceededError      (account credit pool exhausted)
+│   │   └── NewsdataApiKeyLimitExceededError   (this API key's own credit cap exhausted)
+│   └── NewsdataServerError              (5xx)
+├── NewsdataNetworkError                 (carries .original)
+└── NewsdataWebSocketError               (real-time stream)
     └── NewsdataWebSocketAuthError  (handshake 401 / 403, or policy-violation close 1008)
 ```
 
+`NewsdataApiLimitExceededError` and `NewsdataApiKeyLimitExceededError` are both subclasses of `NewsdataRateLimitError`, so existing code that only catches `NewsdataRateLimitError` keeps working unchanged — catch the specific subclasses only if you want to react differently to each. Neither is ever retried.
+
 `NewsdataException` is always a valid catch-all.
 
+When a request succeeds and `include_headers=True`, the response dict's `response_headers` also carries `X-API-Limit-Remaining` (account pool) and, for API keys with a credit cap, `X-APIKEY-Limit-Remaining` (that key's own remaining credits).
+
 ## Save results to CSV
 
 ```python
diff --git a/src/newsdataapi/__init__.py b/src/newsdataapi/__init__.py
index 4d0efbe..a01c6f4 100644
--- a/src/newsdataapi/__init__.py
+++ b/src/newsdataapi/__init__.py
@@ -4,6 +4,8 @@
 from .csv_export import save_to_csv
 from .exceptions import (
     NewsdataAPIError,
+    NewsdataApiKeyLimitExceededError,
+    NewsdataApiLimitExceededError,
     NewsdataAuthError,
     NewsdataException,
     NewsdataNetworkError,
@@ -15,12 +17,14 @@
 )
 from .websocket import NewsDataApiWebSocket
 
-__version__ = "0.3.3"
+__version__ = "0.3.4"
 
 __all__ = [
     "NewsDataApiClient",
     "NewsDataApiWebSocket",
     "NewsdataAPIError",
+    "NewsdataApiKeyLimitExceededError",
+    "NewsdataApiLimitExceededError",
     "NewsdataAuthError",
     "NewsdataException",
     "NewsdataNetworkError",
diff --git a/src/newsdataapi/client.py b/src/newsdataapi/client.py
index d021c62..8b5cf11 100644
--- a/src/newsdataapi/client.py
+++ b/src/newsdataapi/client.py
@@ -18,6 +18,8 @@
 from . import constants, csv_export
 from .exceptions import (
     NewsdataAPIError,
+    NewsdataApiKeyLimitExceededError,
+    NewsdataApiLimitExceededError,
     NewsdataAuthError,
     NewsdataException,
     NewsdataNetworkError,
@@ -85,7 +87,10 @@
     ("domain", "domainurl", "excludedomain", "excludedomainurl"),
 )
 
-_QUOTA_EXHAUSTED_CODES = frozenset({"ApiKeyLimitExceeded", "ApiLimitExceeded"})
+_QUOTA_EXHAUSTED_ERRORS: dict[str, type[NewsdataRateLimitError]] = {
+    "ApiLimitExceeded": NewsdataApiLimitExceededError,
+    "ApiKeyLimitExceeded": NewsdataApiKeyLimitExceededError,
+}
 
 
 def _validate_params(user_params: Mapping[str, Any]) -> dict[str, Any]:
@@ -1190,13 +1195,19 @@ def _request(
                 continue
 
             elapsed = time.perf_counter() - t0
-            logger.debug(
-                "%d %s (%.2fs) X-API-Limit-Remaining=%s",
+            apikey_limit_remaining = response.headers.get("X-APIKEY-Limit-Remaining")
+            log_msg = "%d %s (%.2fs) X-API-Limit-Remaining=%s"
+            log_args = [
                 response.status_code,
                 response.reason,
                 elapsed,
                 response.headers.get("X-API-Limit-Remaining"),
-            )
+            ]
+            if apikey_limit_remaining is not None:
+                # Only sent for API keys that have a credit cap set.
+                log_msg += " X-APIKEY-Limit-Remaining=%s"
+                log_args.append(apikey_limit_remaining)
+            logger.debug(log_msg, *log_args)
 
             try:
                 body: Any = response.json()
@@ -1230,11 +1241,10 @@ def _request(
             # Rate limit.
             if response.status_code == 429:
                 retry_after = _parse_retry_after(response.headers.get("Retry-After"))
-                if (
-                    _extract_error_code(body) in _QUOTA_EXHAUSTED_CODES
-                    or attempt >= self.max_retries
-                ):
-                    raise NewsdataRateLimitError(
+                error_code = _extract_error_code(body)
+                exc_cls = _QUOTA_EXHAUSTED_ERRORS.get(error_code or "", NewsdataRateLimitError)
+                if error_code in _QUOTA_EXHAUSTED_ERRORS or attempt >= self.max_retries:
+                    raise exc_cls(
                         body,
                         status_code=429,
                         response_body=body if isinstance(body, dict) else None,
diff --git a/src/newsdataapi/exceptions.py b/src/newsdataapi/exceptions.py
index efaa3f6..5cfbda2 100644
--- a/src/newsdataapi/exceptions.py
+++ b/src/newsdataapi/exceptions.py
@@ -40,7 +40,7 @@ def __init__(
         message: Any,
         *,
         status_code: int | None = None,
-        response_body: dict[str, Any] | None = None,
+        response_body: dict[str, Any] | None = None
     ) -> None:
         super().__init__(message)
         self.status_code = status_code
@@ -76,6 +76,21 @@ def __init__(
         self.retry_after = retry_after
 
 
+class NewsdataApiLimitExceededError(NewsdataRateLimitError):
+    """Raised on 429 when the account's overall credit pool is exhausted.
+
+    Blocks every API key on the account, regardless of any per-key cap.
+    Never retried.
+    """
+
+
+class NewsdataApiKeyLimitExceededError(NewsdataRateLimitError):
+    """Raised on 429 when this specific API key's own credit cap
+    (``max_credit_limit``) is exhausted, even though the account's overall
+    pool may still have credits left. Never retried.
+    """
+
+
 class NewsdataServerError(NewsdataAPIError):
     """Raised on 5xx responses when retries are exhausted."""
 
diff --git a/tests/test_unit.py b/tests/test_unit.py
index 9a2b8b0..91a1727 100644
--- a/tests/test_unit.py
+++ b/tests/test_unit.py
@@ -19,6 +19,8 @@
 from newsdataapi import (
     NewsDataApiClient,
     NewsdataAPIError,
+    NewsdataApiKeyLimitExceededError,
+    NewsdataApiLimitExceededError,
     NewsDataApiWebSocket,
     NewsdataAuthError,
     NewsdataException,
@@ -728,6 +730,26 @@ def test_include_headers_merges_into_response(
     assert response["response_headers"]["X-API-Limit-Remaining"] == "100"
 
 
+def test_include_headers_merges_apikey_limit_header(
+    mocked_responses: responses.RequestsMock,
+) -> None:
+    """``X-APIKEY-Limit-Remaining`` is only sent for API keys with a credit
+    cap, but the client passes it through like any other header."""
+    with NewsDataApiClient("k", include_headers=True, max_retries=1) as c:
+        mocked_responses.get(
+            LATEST_URL,
+            json={"status": "success", "results": []},
+            status=200,
+            headers={
+                "X-API-Limit-Remaining": "100",
+                "X-APIKEY-Limit-Remaining": "25",
+            },
+        )
+        response = c.latest_api()
+    assert isinstance(response, dict)
+    assert response["response_headers"]["X-APIKEY-Limit-Remaining"] == "25"
+
+
 def test_status_error_with_200_raises_api_error(
     client: NewsDataApiClient,
     mocked_responses: responses.RequestsMock,
@@ -835,18 +857,27 @@ def test_429_exhausted_raises_rate_limit_with_retry_after(
     assert exc_info.value.retry_after == 5
 
 
-@pytest.mark.parametrize("code", ["ApiKeyLimitExceeded", "ApiLimitExceeded"])
+@pytest.mark.parametrize(
+    ("code", "expected_exc"),
+    [
+        ("ApiLimitExceeded", NewsdataApiLimitExceededError),
+        ("ApiKeyLimitExceeded", NewsdataApiKeyLimitExceededError),
+    ],
+)
 def test_429_quota_exhausted_raises_without_retry(
     code: str,
+    expected_exc: type[NewsdataRateLimitError],
     client: NewsDataApiClient,
     mocked_responses: responses.RequestsMock,
     no_sleep: None,
 ) -> None:
-    """A 429 whose error code means exhausted credits is never retried."""
+    """A 429 whose error code means exhausted credits is never retried,
+    and raises the specific subclass for that code."""
     body = {"status": "error", "results": {"message": "limit", "code": code}}
     mocked_responses.get(LATEST_URL, json=body, status=429)
-    with pytest.raises(NewsdataRateLimitError) as exc_info:
+    with pytest.raises(expected_exc) as exc_info:
         client.latest_api()
+    assert isinstance(exc_info.value, NewsdataRateLimitError)
     assert len(mocked_responses.calls) == 1
     assert exc_info.value.response_body == body