diff --git a/scripts/surfer/ibkr_paper_book.py b/scripts/surfer/ibkr_paper_book.py
new file mode 100644
index 000000000..ed1102c12
--- /dev/null
+++ b/scripts/surfer/ibkr_paper_book.py
@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+"""Run the adaptive multi-strat book on IBKR PAPER trading (realistic fills, no capital).
+
+Gets target weights from the harness (Yahoo data), connects to your IB Gateway/TWS paper account,
+and rebalances the ETF book on it. Crypto sleeve -> IBIT (Bitcoin ETF: in-brokerage, no crypto-
+exchange counterparty tail). Default DRY-RUN (shows intended orders); pass `rebalance` to place them.
+
+SETUP (you do this — your credentials, never me):
+  1. Create a free IBKR paper-trading account (or use your live account's paper login).
+  2. Run IB Gateway (or TWS) and log in to the PAPER account.
+  3. In Gateway/TWS: API settings -> enable "ActiveX and Socket Clients", note the port
+     (IB Gateway paper = 4002, TWS paper = 7497). Add 127.0.0.1 to trusted IPs.
+  4. Then: python3 scripts/surfer/ibkr_paper_book.py status        (test the connection)
+           python3 scripts/surfer/ibkr_paper_book.py dry           (show intended orders)
+           python3 scripts/surfer/ibkr_paper_book.py rebalance     (place orders on PAPER)
+  Override port: ... <mode> --port 7497
+
+Sizing uses Yahoo last-close (consistent with the book); IBKR fills at market. Hysteresis: only
+trade a name if its target $ drifts > 3% of NLV. Run weekly/monthly via cron once validated.
+"""
+import datetime
+import json
+import math
+import os
+import sys
+import urllib.request
+
+import numpy as np
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from multistrat_paper import build, book_series, INSTR  # noqa: E402
+
+TICKER = {"equity": "SPY", "bond": "IEF", "gold": "GLD", "commod": "PDBC", "trend": "DBMF", "crypto": "IBIT"}
+HYST = 0.03  # only trade if target weight drifts > 3% of NLV
+
+
+def yhist_last(sym):
+    res = json.loads(urllib.request.urlopen(urllib.request.Request(
+        f"https://query1.finance.yahoo.com/v8/finance/chart/{sym}?interval=1d&range=5d",
+        headers={"User-Agent": "Mozilla/5.0"}), timeout=30).read())["chart"]["result"][0]
+    c = [x for x in res["indicators"]["quote"][0]["close"] if x is not None]
+    return float(c[-1])
+
+
+def target_book():
+    """{ticker: weight} from the adaptive harness (Yahoo data)."""
+    dates, R = build()
+    book, w, L = book_series(R)
+    return {TICKER[nm]: float(w[j] * L) for j, (_, nm) in enumerate(INSTR)}
+
+
+def main():
+    mode = sys.argv[1] if len(sys.argv) > 1 else "dry"
+    port = int(sys.argv[sys.argv.index("--port") + 1]) if "--port" in sys.argv else 4002
+
+    tw = target_book()
+    px = {t: yhist_last(t if t != "IBIT" else "IBIT") for t in tw}   # IBIT trades on Yahoo too
+    print(f"target weights (adaptive book, {datetime.date.today()}):")
+    for t, w in tw.items():
+        print(f"  {t:>6}: {100*w:>5.1f}%   (px ~${px[t]:.2f})")
+
+    if mode == "target":
+        return
+
+    from ib_async import IB, Stock, MarketOrder
+    ib = IB()
+    try:
+        ib.connect("127.0.0.1", port, clientId=7, timeout=15)
+    except Exception as e:
+        print(f"\nCONNECT FAILED on 127.0.0.1:{port} — is IB Gateway/TWS running + logged in to PAPER, API enabled?")
+        print(f"  ({type(e).__name__}: {str(e)[:80]})  | try --port 7497 for TWS paper")
+        return
+    nlv = next((float(v.value) for v in ib.accountSummary() if v.tag == "NetLiquidation"), 0.0)
+    cash = next((float(v.value) for v in ib.accountSummary() if v.tag == "TotalCashValue"), 0.0)
+    pos = {p.contract.symbol: p.position for p in ib.positions()}
+    print(f"\nIBKR PAPER account: NLV ${nlv:,.0f}  cash ${cash:,.0f}  | positions: {pos or 'none'}")
+    if nlv <= 0:
+        print("  (no NLV — check the paper account is funded with paper cash)"); ib.disconnect(); return
+
+    orders = []
+    for t, w in tw.items():
+        tgt_sh = nlv * w / px[t]
+        cur = pos.get(t, 0.0)
+        delta = tgt_sh - cur
+        if abs(delta * px[t]) > HYST * nlv:
+            orders.append((t, "BUY" if delta > 0 else "SELL", round(abs(delta), 4)))
+    print(f"\nintended orders (hysteresis {int(HYST*100)}% of NLV):")
+    for t, side, qty in orders:
+        print(f"  {side:>4} {qty:>9.4f} {t}  (~${qty*px[t]:,.0f})")
+    if not orders:
+        print("  none — book already within hysteresis band.")
+
+    if mode == "rebalance" and orders:
+        print("\nPLACING on PAPER...")
+        for t, side, qty in orders:
+            c = Stock(t, "SMART", "USD"); ib.qualifyContracts(c)
+            o = MarketOrder(side, qty); o.account = ib.managedAccounts()[0]
+            tr = ib.placeOrder(c, o); ib.sleep(1)
+            print(f"  {side} {qty} {t}: {tr.orderStatus.status}")
+        ib.sleep(3)
+        print("done — check fills in Gateway/TWS.")
+    elif orders:
+        print("\n(dry-run — pass 'rebalance' to actually place these on the paper account.)")
+    ib.disconnect()
+
+
+if __name__ == "__main__":
+    main()