diff --git a/.env.example b/.env.example
index 84e5e9d8..924dd6c9 100644
--- a/.env.example
+++ b/.env.example
@@ -52,8 +52,13 @@ LLM_API_KEY=your-llm-api-key
 # LLM_BASE_URL=https://api.venice.ai/api/v1  # auto-set for known providers
 # LLM_MODEL=grok-41-fast  # auto-set for known providers
 
+# Dune (hourly large-transfer monitor)
+DUNE_API_KEY=your-dune-api-key
+DUNE_LARGE_TRANSFERS_QUERY_ID=1234567
+# DUNE_LARGE_TRANSFER_THRESHOLD=5000000
+
 # Global settings
 LOG_LEVEL=INFO  # DEBUG, INFO, WARNING, ERROR (DEBUG skips Telegram sends)
 REQUEST_TIMEOUT=30
 RETRY_COUNT=3
-BACKOFF_FACTOR=1.0
\ No newline at end of file
+BACKOFF_FACTOR=1.0
diff --git a/.github/workflows/_run-monitoring.yml b/.github/workflows/_run-monitoring.yml
index 40fbcd68..f4cf1b61 100644
--- a/.github/workflows/_run-monitoring.yml
+++ b/.github/workflows/_run-monitoring.yml
@@ -126,6 +126,8 @@ env:
   LLM_API_KEY: ${{ secrets.LLM_API_KEY }}
   LLM_MODEL: ${{ secrets.LLM_MODEL }}
   LLM_PROVIDER: ${{ secrets.LLM_PROVIDER }}
+  DUNE_API_KEY: ${{ secrets.DUNE_API_KEY }}
+  DUNE_LARGE_TRANSFERS_QUERY_ID: ${{ vars.DUNE_LARGE_TRANSFERS_QUERY_ID }}
 
 jobs:
   run:
diff --git a/.github/workflows/hourly.yml b/.github/workflows/hourly.yml
index 32ef47a5..be5bd6d8 100644
--- a/.github/workflows/hourly.yml
+++ b/.github/workflows/hourly.yml
@@ -30,6 +30,7 @@ jobs:
         # silo/ur_sniff.py
         usdai/main.py
         usdai/large_mints.py
+        stables/dune_large_transfers.py
         yearn/alert_large_flows.py
         maple/main.py
         timelock/timelock_alerts.py
diff --git a/stables/dune_large_transfers.py b/stables/dune_large_transfers.py
new file mode 100644
index 00000000..402df6d1
--- /dev/null
+++ b/stables/dune_large_transfers.py
@@ -0,0 +1,210 @@
+#!/usr/bin/env python3
+"""Hourly large-transfer monitor backed by a Dune query result.
+
+Expected Dune query output columns:
+- block_time
+- blockchain
+- tx_hash
+- from
+- to
+- contract_address
+- symbol
+- amount
+- amount_usd
+
+Rows are sorted defensively by ``block_time`` descending before deduping and
+alerting.
+"""
+
+from __future__ import annotations
+
+import os
+from typing import Any
+
+from dune_client.client import DuneClient
+from dune_client.query import QueryBase
+
+from utils.alert import Alert, AlertSeverity, send_alert
+from utils.cache import cache_filename, get_last_value_for_key_from_file, write_last_value_to_file
+from utils.config import Config
+from utils.logging import get_logger
+
+logger = get_logger("stables.dune_large_transfers")
+PROTOCOL = "stables"
+
+CACHE_KEY_LAST_TX = "stables_dune_large_transfers_last_tx"
+MAX_ROWS_PER_PROTOCOL_ALERT = 10
+DEFAULT_LARGE_TRANSFER_THRESHOLD = 5_000_000.0
+
+# Route each token to its owning protocol channel.
+TOKEN_ROUTE: dict[tuple[str, str], tuple[str, str]] = {
+    ("ethereum", "0xcccc62962d17b8914c62d74ffb843d73b2a3cccc"): ("cUSD", "cap"),
+    ("ethereum", "0x48f9e38f3070ad8945dfeae3fa70987722e3d89c"): ("iUSD", "infinifi"),
+}
+
+CHAIN_TX_EXPLORER: dict[str, str] = {
+    "ethereum": "https://etherscan.io/tx/",
+    "arbitrum": "https://arbiscan.io/tx/",
+    "optimism": "https://optimistic.etherscan.io/tx/",
+    "base": "https://basescan.org/tx/",
+    "polygon": "https://polygonscan.com/tx/",
+}
+
+
+def _as_str(value: Any) -> str:
+    if value is None:
+        return ""
+    return str(value)
+
+
+def _tx_link(blockchain: str, tx_hash: str) -> str:
+    prefix = CHAIN_TX_EXPLORER.get(blockchain.lower())
+    if not prefix:
+        return tx_hash
+    return f"{prefix}{tx_hash}"
+
+
+def _row_key(row: dict[str, Any]) -> str:
+    tx_hash = _as_str(row.get("tx_hash")).lower()
+    contract = _as_str(row.get("contract_address")).lower()
+    log_index = _as_str(row.get("log_index"))
+    parts = [tx_hash, contract]
+    if log_index:
+        parts.append(log_index)
+    return "|".join(parts)
+
+
+def _route_for_row(row: dict[str, Any]) -> tuple[str, str] | None:
+    chain = _as_str(row.get("blockchain")).lower()
+    addr = _as_str(row.get("contract_address")).lower()
+    return TOKEN_ROUTE.get((chain, addr))
+
+
+def _build_row_line(row: dict[str, Any]) -> str:
+    chain = _as_str(row.get("blockchain"))
+    symbol = _as_str(row.get("symbol")) or "unknown"
+    amount = row.get("amount")
+    amount_usd = row.get("amount_usd")
+    tx_hash = _as_str(row.get("tx_hash"))
+    link = _tx_link(chain, tx_hash)
+    return f"- {symbol} on {chain}: amount={amount}, amount_usd={amount_usd}, tx={link}"
+
+
+def _build_protocol_lines(protocol_rows: list[dict[str, Any]], query_id: int) -> list[str]:
+    included_rows = protocol_rows[:MAX_ROWS_PER_PROTOCOL_ALERT]
+    lines = [_build_row_line(row) for row in included_rows]
+
+    omitted_count = len(protocol_rows) - len(included_rows)
+    if omitted_count > 0:
+        lines.append(f"- +{omitted_count} more not shown -- see Dune query {query_id} directly")
+
+    return lines
+
+
+def _group_rows_by_protocol(rows: list[dict[str, Any]]) -> dict[str, list[dict[str, Any]]]:
+    grouped: dict[str, list[dict[str, Any]]] = {}
+    for row in rows:
+        route = _route_for_row(row)
+        if route is None:
+            continue
+        _, protocol = route
+        grouped.setdefault(protocol, []).append(row)
+    return grouped
+
+
+def _to_float(value: Any) -> float:
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return 0.0
+
+
+def _is_large_transfer(row: dict[str, Any], threshold: float) -> bool:
+    amount_usd = _to_float(row.get("amount_usd"))
+    return amount_usd >= threshold
+
+
+def _sort_rows_newest_first(rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    return sorted(rows, key=lambda row: _as_str(row.get("block_time")), reverse=True)
+
+
+def _new_rows_since_last_seen(rows: list[dict[str, Any]], last_key: str) -> list[dict[str, Any]]:
+    if not last_key:
+        return rows
+
+    new_rows: list[dict[str, Any]] = []
+    for row in rows:
+        if _row_key(row) == last_key:
+            break
+        new_rows.append(row)
+    return new_rows
+
+
+def main() -> None:
+    api_key = os.getenv("DUNE_API_KEY")
+    query_id = Config.get_env_int("DUNE_LARGE_TRANSFERS_QUERY_ID", 0)
+    threshold = Config.get_env_float("DUNE_LARGE_TRANSFER_THRESHOLD", DEFAULT_LARGE_TRANSFER_THRESHOLD)
+
+    if not api_key:
+        logger.warning("DUNE_API_KEY is not set; skipping Dune large transfer monitor")
+        return
+    if query_id <= 0:
+        logger.warning("DUNE_LARGE_TRANSFERS_QUERY_ID is not set; skipping Dune large transfer monitor")
+        return
+
+    try:
+        dune = DuneClient(api_key)
+        result = dune.run_query(QueryBase(query_id=query_id, name="stables_large_transfers"), ping_frequency=2)
+        rows = list(result.result.rows) if result and result.result and result.result.rows else []
+    except Exception as exc:
+        logger.error("Failed to fetch Dune large-transfer query result: %s", exc)
+        send_alert(
+            Alert(
+                AlertSeverity.MEDIUM,
+                f"Dune large-transfer monitor failed while querying Dune: {exc}",
+                PROTOCOL,
+            ),
+            plain_text=True,
+        )
+        return
+
+    if not rows:
+        logger.info("No large transfers returned by Dune query_id=%s", query_id)
+        return
+
+    alert_rows = [
+        row
+        for row in _sort_rows_newest_first(rows)
+        if _is_large_transfer(row, threshold) and _route_for_row(row) is not None
+    ]
+    if not alert_rows:
+        logger.info("No routed rows matched large-transfer threshold >= %s", threshold)
+        return
+
+    last_key = _as_str(get_last_value_for_key_from_file(cache_filename, CACHE_KEY_LAST_TX))
+    new_alert_rows = _new_rows_since_last_seen(alert_rows, last_key)
+    if not new_alert_rows:
+        logger.info("No new large-transfer rows since last run")
+        return
+
+    grouped = _group_rows_by_protocol(new_alert_rows)
+    total_rows = len(new_alert_rows)
+    for protocol, protocol_rows in grouped.items():
+        route = _route_for_row(protocol_rows[0])
+        if route is None:
+            continue
+        first_symbol, _ = route
+        lines = _build_protocol_lines(protocol_rows, query_id)
+        message = (
+            f"*Dune Large Transfer Alert ({first_symbol}/{protocol})*\n\n"
+            f"Query ID: {query_id}\n"
+            f"Matched rows: {total_rows}\n"
+            f"Included in this alert: {min(len(protocol_rows), MAX_ROWS_PER_PROTOCOL_ALERT)}\n\n" + "\n".join(lines)
+        )
+        send_alert(Alert(AlertSeverity.HIGH, message, protocol), plain_text=True)
+
+    write_last_value_to_file(cache_filename, CACHE_KEY_LAST_TX, _row_key(alert_rows[0]))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/test_dune_large_transfers.py b/tests/test_dune_large_transfers.py
new file mode 100644
index 00000000..6683d015
--- /dev/null
+++ b/tests/test_dune_large_transfers.py
@@ -0,0 +1,82 @@
+"""Tests for the Dune-backed large transfer monitor."""
+
+from stables import dune_large_transfers as monitor
+
+
+def _row(**overrides):
+    row = {
+        "block_time": "2026-05-12 14:30:00.000 UTC",
+        "blockchain": "ethereum",
+        "tx_hash": "0xABC",
+        "contract_address": "0xCCCC62962d17b8914c62D74FfB843d73B2a3cCCc",
+        "symbol": "cUSD",
+        "amount": "5000000",
+        "amount_usd": "5000000",
+    }
+    row.update(overrides)
+    return row
+
+
+def test_row_key_excludes_colon_timestamp_from_cache_value():
+    key = monitor._row_key(_row(block_time="2026-05-12 14:30:00.000 UTC", log_index=None))
+
+    assert ":" not in key
+    assert key == "0xabc|0xcccc62962d17b8914c62d74ffb843d73b2a3cccc"
+
+
+def test_row_key_uses_log_index_when_present():
+    key = monitor._row_key(_row(log_index=17))
+
+    assert key.endswith("|17")
+
+
+def test_route_for_row_returns_protocol_for_known_token():
+    assert monitor._route_for_row(_row()) == ("cUSD", "cap")
+
+
+def test_route_for_row_skips_unknown_token_instead_of_stables_fallback():
+    row = _row(contract_address="0x0000000000000000000000000000000000000000")
+
+    assert monitor._route_for_row(row) is None
+
+
+def test_route_for_row_skips_usdai():
+    row = _row(
+        blockchain="arbitrum",
+        contract_address="0x0a1a1a107e45b7ced86833863f482bc5f4ed82ef",
+        symbol="USDai",
+    )
+
+    assert monitor._route_for_row(row) is None
+
+
+def test_is_large_transfer_requires_positive_usd_amount():
+    row = _row(amount="5000000", amount_usd="0")
+
+    assert monitor._is_large_transfer(row, 5_000_000) is False
+
+
+def test_new_rows_since_last_seen_only_returns_new_prefix():
+    newest = _row(tx_hash="0xnew", block_time="2026-05-12 15:00:00.000 UTC")
+    previous = _row(tx_hash="0xold", block_time="2026-05-12 14:00:00.000 UTC")
+    older = _row(tx_hash="0xolder", block_time="2026-05-12 13:00:00.000 UTC")
+
+    rows = [newest, previous, older]
+
+    assert monitor._new_rows_since_last_seen(rows, monitor._row_key(previous)) == [newest]
+
+
+def test_sort_rows_newest_first_defends_dedup_order():
+    newest = _row(tx_hash="0xnew", block_time="2026-05-12 15:00:00.000 UTC")
+    older = _row(tx_hash="0xold", block_time="2026-05-12 14:00:00.000 UTC")
+
+    assert monitor._sort_rows_newest_first([older, newest]) == [newest, older]
+
+
+def test_build_protocol_lines_appends_truncation_notice():
+    rows = [_row(tx_hash=f"0x{i}") for i in range(monitor.MAX_ROWS_PER_PROTOCOL_ALERT + 2)]
+
+    lines = monitor._build_protocol_lines(rows, query_id=1234567)
+
+    assert len(lines) == monitor.MAX_ROWS_PER_PROTOCOL_ALERT + 1
+    assert lines[-1] == "- +2 more not shown -- see Dune query 1234567 directly"