diff --git a/src/arcaea_offline/external/arcaea/__init__.py b/src/arcaea_offline/external/arcaea/__init__.py
index c18f1fb..8fe4ea9 100644
--- a/src/arcaea_offline/external/arcaea/__init__.py
+++ b/src/arcaea_offline/external/arcaea/__init__.py
@@ -1,3 +1,4 @@
+from .online import ArcaeaOnlineParser
 from .packlist import PacklistParser
 from .songlist import SonglistDifficultiesParser, SonglistParser
 from .st3 import St3ScoreParser
diff --git a/src/arcaea_offline/external/arcaea/common.py b/src/arcaea_offline/external/arcaea/common.py
index f1c8e4c..200c652 100644
--- a/src/arcaea_offline/external/arcaea/common.py
+++ b/src/arcaea_offline/external/arcaea/common.py
@@ -1,11 +1,41 @@
 import contextlib
 import json
+import math
+import time
 from os import PathLike
 from typing import Any, List, Optional, Union
 
 from sqlalchemy.orm import DeclarativeBase, Session
 
 
+def fix_timestamp(timestamp: int) -> Union[int, None]:
+    """
+    Some of the `date` column in st3 are strangely truncated. For example,
+    a `1670283375` may be truncated to `167028`, even `1`. Yes, a single `1`.
+
+    To properly handle this situation, we check the timestamp's digits.
+    If `digits < 5`, we treat this timestamp as a `None`. Otherwise, we try to
+    fix the timestamp.
+
+    :param timestamp: a POSIX timestamp
+    :return: `None` if the timestamp's digits < 5, otherwise a fixed POSIX timestamp
+    """
+    # find digit length from https://stackoverflow.com/a/2189827/16484891
+    # CC BY-SA 2.5
+    # this might give incorrect result when timestamp > 999999999999997,
+    # see https://stackoverflow.com/a/28883802/16484891 (CC BY-SA 4.0).
+    # but that's way too later than 9999-12-31 23:59:59, 253402271999,
+    # I don't think Arcaea would still be an active updated game by then.
+    # so don't mind those small issues, just use this.
+    digits = int(math.log10(timestamp)) + 1
+    if digits < 5:
+        return None
+    timestamp_str = str(timestamp)
+    current_timestamp_digits = int(math.log10(int(time.time() / 1000))) + 1
+    timestamp_str = timestamp_str.ljust(current_timestamp_digits, "0")
+    return int(timestamp_str, 10)
+
+
 def to_db_value(val: Any) -> Any:
     if not val:
         return None
diff --git a/src/arcaea_offline/external/arcaea/online.py b/src/arcaea_offline/external/arcaea/online.py
new file mode 100644
index 0000000..835b5ff
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/online.py
@@ -0,0 +1,75 @@
+import json
+import logging
+from datetime import datetime
+from typing import Dict, List, Literal, Optional, TypedDict
+
+from ...models import Score
+from .common import ArcaeaParser, fix_timestamp
+
+logger = logging.getLogger(__name__)
+
+
+class TWebApiRatingMeScoreItem(TypedDict):
+    song_id: str
+    difficulty: int
+    modifier: int
+    rating: float
+    score: int
+    perfect_count: int
+    near_count: int
+    miss_count: int
+    clear_type: int
+    title: Dict[Literal["ja", "en"], str]
+    artist: str
+    time_played: int
+    bg: str
+
+
+class TWebApiRatingMeValue(TypedDict):
+    best_rated_scores: List[TWebApiRatingMeScoreItem]
+    recent_rated_scores: List[TWebApiRatingMeScoreItem]
+
+
+class TWebApiRatingMeResult(TypedDict):
+    success: bool
+    error_code: Optional[int]
+    value: Optional[TWebApiRatingMeValue]
+
+
+class ArcaeaOnlineParser(ArcaeaParser):
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    def parse(self) -> List[Score]:
+        api_result_root: TWebApiRatingMeResult = json.loads(self.read_file_text())
+
+        api_result_value = api_result_root.get("value")
+        if not api_result_value:
+            error_code = api_result_root.get("error_code")
+            raise ValueError(f"Cannot parse API result, error code {error_code}")
+
+        best30_score_items = api_result_value.get("best_rated_scores", [])
+        recent_score_items = api_result_value.get("recent_rated_scores", [])
+        score_items = best30_score_items + recent_score_items
+
+        date_text = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+        results: List[Score] = []
+        for score_item in score_items:
+            score = Score()
+            score.song_id = score_item["song_id"]
+            score.rating_class = score_item["difficulty"]
+            score.score = score_item["score"]
+            score.pure = score_item["perfect_count"]
+            score.far = score_item["near_count"]
+            score.lost = score_item["miss_count"]
+            score.date = fix_timestamp(int(score_item["time_played"] / 1000))
+            score.modifier = score_item["modifier"]
+            score.clear_type = score_item["clear_type"]
+
+            if score.lost == 0:
+                score.max_recall = score.pure + score.far
+
+            score.comment = f"Parsed from web API at {date_text}"
+            results.append(score)
+        return results