diff --git a/orders/services/__init__.py b/orders/services/__init__.py
index 97c0882..8280e53 100644
--- a/orders/services/__init__.py
+++ b/orders/services/__init__.py
@@ -4,3 +4,6 @@ from __future__ import annotations
 
 def register_domain_services() -> None:
     """Register services for the orders app."""
+    from shared.services.registry import services
+    from .orders_page import OrdersPageService
+    services.register("orders_page", OrdersPageService())
diff --git a/orders/services/orders_page.py b/orders/services/orders_page.py
new file mode 100644
index 0000000..2acec4d
--- /dev/null
+++ b/orders/services/orders_page.py
@@ -0,0 +1,138 @@
+"""Orders page data service — provides serialized dicts for .sx defpages."""
+from __future__ import annotations
+
+from sqlalchemy import select, func, or_, cast, String, exists
+from sqlalchemy.orm import selectinload
+
+from shared.models.order import Order, OrderItem
+from shared.infrastructure.cart_identity import current_cart_identity
+from shared.infrastructure.urls import market_product_url
+
+
+class OrdersPageService:
+    """Service for orders page data, callable via (service "orders-page" ...)."""
+
+    async def list_page_data(self, session, *, search="", page=1):
+        """Return orders list + pagination metadata as a dict."""
+        PER_PAGE = 10
+        ident = current_cart_identity()
+        if ident["user_id"]:
+            owner = Order.user_id == ident["user_id"]
+        elif ident["session_id"]:
+            owner = Order.session_id == ident["session_id"]
+        else:
+            return {"orders": [], "page": 1, "total_pages": 1,
+                    "search": "", "search_count": 0}
+
+        page = max(1, int(page))
+
+        where = None
+        if search:
+            term = f"%{search.strip()}%"
+            conds = [
+                Order.status.ilike(term),
+                Order.currency.ilike(term),
+                Order.sumup_checkout_id.ilike(term),
+                Order.sumup_status.ilike(term),
+                Order.description.ilike(term),
+                exists(
+                    select(1).select_from(OrderItem)
+                    .where(OrderItem.order_id == Order.id,
+                           or_(OrderItem.product_title.ilike(term),
+                               OrderItem.product_slug.ilike(term)))
+                ),
+            ]
+            try:
+                conds.append(Order.id == int(search))
+            except (TypeError, ValueError):
+                conds.append(cast(Order.id, String).ilike(term))
+            where = or_(*conds)
+
+        count_q = select(func.count()).select_from(Order).where(owner)
+        if where is not None:
+            count_q = count_q.where(where)
+        total_count = (await session.execute(count_q)).scalar_one() or 0
+        total_pages = max(1, (total_count + PER_PAGE - 1) // PER_PAGE)
+        if page > total_pages:
+            page = total_pages
+
+        stmt = (select(Order).where(owner)
+                .order_by(Order.created_at.desc())
+                .offset((page - 1) * PER_PAGE).limit(PER_PAGE))
+        if where is not None:
+            stmt = stmt.where(where)
+        rows = (await session.execute(stmt)).scalars().all()
+
+        orders = []
+        for o in rows:
+            orders.append({
+                "id": o.id,
+                "status": o.status or "pending",
+                "created_at_formatted": (
+                    o.created_at.strftime("%-d %b %Y, %H:%M")
+                    if o.created_at else "\u2014"),
+                "description": o.description or "",
+                "currency": o.currency or "GBP",
+                "total_formatted": f"{o.total_amount or 0:.2f}",
+            })
+
+        return {
+            "orders": orders,
+            "page": page,
+            "total_pages": total_pages,
+            "search": search or "",
+            "search_count": total_count,
+        }
+
+    async def detail_page_data(self, session, *, order_id=None):
+        """Return order detail data as a dict."""
+        from quart import abort
+
+        if order_id is None:
+            abort(404)
+
+        ident = current_cart_identity()
+        if ident["user_id"]:
+            owner = Order.user_id == ident["user_id"]
+        elif ident["session_id"]:
+            owner = Order.session_id == ident["session_id"]
+        else:
+            abort(404)
+            return {}
+
+        result = await session.execute(
+            select(Order).options(selectinload(Order.items))
+            .where(Order.id == int(order_id), owner)
+        )
+        order = result.scalar_one_or_none()
+        if not order:
+            abort(404)
+            return {}
+
+        items = []
+        for item in (order.items or []):
+            items.append({
+                "product_url": market_product_url(item.product_slug),
+                "product_image": item.product_image,
+                "product_title": item.product_title,
+                "product_id": item.product_id,
+                "quantity": item.quantity,
+                "currency": item.currency,
+                "unit_price_formatted": f"{item.unit_price or 0:.2f}",
+            })
+
+        return {
+            "order": {
+                "id": order.id,
+                "status": order.status or "pending",
+                "created_at_formatted": (
+                    order.created_at.strftime("%-d %b %Y, %H:%M")
+                    if order.created_at else "\u2014"),
+                "description": order.description or "",
+                "currency": order.currency or "GBP",
+                "total_formatted": (
+                    f"{order.total_amount:.2f}"
+                    if order.total_amount else "0.00"),
+                "items": items,
+            },
+        }
diff --git a/orders/sxc/pages/__init__.py b/orders/sxc/pages/__init__.py
index 4250a62..97b25ef 100644
--- a/orders/sxc/pages/__init__.py
+++ b/orders/sxc/pages/__init__.py
@@ -1,13 +1,12 @@
-"""Orders defpage setup — registers layouts, page helpers, and loads .sx pages."""
+"""Orders defpage setup — registers layouts and loads .sx pages."""
 from __future__ import annotations
 
 from typing import Any
 
 
 def setup_orders_pages() -> None:
-    """Register orders-specific layouts, page helpers, and load page definitions."""
+    """Register orders-specific layouts and load page definitions."""
     _register_orders_layouts()
-    _register_orders_helpers()
     _load_orders_page_files()
 
 
@@ -125,325 +124,3 @@ def _as_sx_nav(ctx: dict) -> Any:
     """Convert account_nav fragment to SxExpr for use in component calls."""
     from shared.sx.helpers import _as_sx
     return _as_sx(ctx.get("account_nav"))
-
-
-# ---------------------------------------------------------------------------
-# Page helpers — Python functions callable from defpage expressions
-# ---------------------------------------------------------------------------
-
-def _register_orders_helpers() -> None:
-    from shared.sx.pages import register_page_helpers
-
-    register_page_helpers("orders", {
-        # Orders list
-        "orders-list-content": _h_orders_list_content,
-        "orders-list-filter": _h_orders_list_filter,
-        "orders-list-aside": _h_orders_list_aside,
-        "orders-list-url": _h_orders_list_url,
-        # Order detail
-        "order-detail-content": _h_order_detail_content,
-        "order-detail-filter": _h_order_detail_filter,
-        "order-detail-url": _h_order_detail_url,
-        "order-list-url-from-detail": _h_order_list_url_from_detail,
-    })
-
-
-async def _ensure_orders_list():
-    """Fetch orders list data and store in g.orders_page_data."""
-    from quart import g, url_for
-    if hasattr(g, "orders_page_data"):
-        return
-    from sqlalchemy import select, func, or_, cast, String, exists
-    from shared.models.order import Order, OrderItem
-    from shared.infrastructure.cart_identity import current_cart_identity
-    from shared.utils import route_prefix
-
-    ORDERS_PER_PAGE = 10
-    ident = current_cart_identity()
-    if ident["user_id"]:
-        owner_clause = Order.user_id == ident["user_id"]
-    elif ident["session_id"]:
-        owner_clause = Order.session_id == ident["session_id"]
-    else:
-        g.orders_page_data = None
-        return
-
-    from bp.orders.filters.qs import makeqs_factory, decode
-    q = decode()
-    page, search = q.page, q.search
-    if page < 1:
-        page = 1
-
-    where_clause = None
-    if search:
-        term = f"%{search.strip()}%"
-        conditions = [
-            Order.status.ilike(term),
-            Order.currency.ilike(term),
-            Order.sumup_checkout_id.ilike(term),
-            Order.sumup_status.ilike(term),
-            Order.description.ilike(term),
-        ]
-        conditions.append(
-            exists(
-                select(1).select_from(OrderItem)
-                .where(OrderItem.order_id == Order.id,
-                       or_(OrderItem.product_title.ilike(term),
-                           OrderItem.product_slug.ilike(term)))
-            )
-        )
-        try:
-            search_id = int(search)
-        except (TypeError, ValueError):
-            search_id = None
-        if search_id is not None:
-            conditions.append(Order.id == search_id)
-        else:
-            conditions.append(cast(Order.id, String).ilike(term))
-        where_clause = or_(*conditions)
-
-    count_stmt = select(func.count()).select_from(Order).where(owner_clause)
-    if where_clause is not None:
-        count_stmt = count_stmt.where(where_clause)
-
-    total_count_result = await g.s.execute(count_stmt)
-    total_count = total_count_result.scalar_one() or 0
-    total_pages = max(1, (total_count + ORDERS_PER_PAGE - 1) // ORDERS_PER_PAGE)
-    if page > total_pages:
-        page = total_pages
-
-    offset = (page - 1) * ORDERS_PER_PAGE
-    stmt = (
-        select(Order).where(owner_clause)
-        .order_by(Order.created_at.desc())
-        .offset(offset).limit(ORDERS_PER_PAGE)
-    )
-    if where_clause is not None:
-        stmt = stmt.where(where_clause)
-
-    result = await g.s.execute(stmt)
-    orders = result.scalars().all()
-    pfx = route_prefix()
-    qs_fn = makeqs_factory()
-
-    g.orders_page_data = {
-        "orders": orders,
-        "page": page,
-        "total_pages": total_pages,
-        "search": search,
-        "search_count": total_count,
-        "url_for_fn": url_for,
-        "qs_fn": qs_fn,
-        "list_url": pfx + url_for("defpage_orders_list"),
-    }
-
-
-async def _ensure_order_detail(order_id):
-    """Fetch order detail data and store in g.order_detail_data."""
-    from quart import g, url_for, abort
-    if hasattr(g, "order_detail_data"):
-        return
-    from sqlalchemy import select
-    from sqlalchemy.orm import selectinload
-    from shared.models.order import Order
-    from shared.infrastructure.cart_identity import current_cart_identity
-    from shared.utils import route_prefix
-    from shared.browser.app.csrf import generate_csrf_token
-
-    if order_id is None:
-        abort(404)
-
-    ident = current_cart_identity()
-    if ident["user_id"]:
-        owner = Order.user_id == ident["user_id"]
-    elif ident["session_id"]:
-        owner = Order.session_id == ident["session_id"]
-    else:
-        abort(404)
-        return
-
-    result = await g.s.execute(
-        select(Order).options(selectinload(Order.items))
-        .where(Order.id == order_id, owner)
-    )
-    order = result.scalar_one_or_none()
-    if not order:
-        abort(404)
-        return
-
-    pfx = route_prefix()
-    g.order_detail_data = {
-        "order": order,
-        "calendar_entries": None,
-        "detail_url": pfx + url_for("defpage_order_detail", order_id=order.id),
-        "list_url": pfx + url_for("defpage_orders_list"),
-        "recheck_url": pfx + url_for("orders.order.order_recheck", order_id=order.id),
-        "pay_url": pfx + url_for("orders.order.order_pay", order_id=order.id),
-        "csrf_token": generate_csrf_token(),
-    }
-
-
-async def _h_orders_list_content(**kw):
-    await _ensure_orders_list()
-    from quart import g
-    from shared.sx.helpers import render_to_sx
-    d = getattr(g, "orders_page_data", None)
-    if not d:
-        return await render_to_sx("order-empty-state")
-
-    orders = d["orders"]
-    url_for_fn = d["url_for_fn"]
-    pfx = d.get("list_url", "/").rsplit("/", 1)[0] if d.get("list_url") else ""
-
-    order_dicts = []
-    for o in orders:
-        order_dicts.append({
-            "id": o.id,
-            "status": o.status or "pending",
-            "created_at_formatted": o.created_at.strftime("%-d %b %Y, %H:%M") if o.created_at else "\u2014",
-            "description": o.description or "",
-            "currency": o.currency or "GBP",
-            "total_formatted": f"{o.total_amount or 0:.2f}",
-        })
-
-    from shared.utils import route_prefix
-    rpfx = route_prefix()
-    detail_prefix = rpfx + url_for_fn("defpage_order_detail", order_id=0).rsplit("0/", 1)[0]
-    rows_url = rpfx + url_for_fn("orders.orders_rows")
-
-    return await render_to_sx("orders-list-content",
-        orders=order_dicts,
-        page=d["page"],
-        total_pages=d["total_pages"],
-        rows_url=rows_url,
-        detail_url_prefix=detail_prefix)
-
-
-async def _h_orders_list_filter(**kw):
-    await _ensure_orders_list()
-    from quart import g
-    from shared.sx.helpers import render_to_sx
-    from shared.sx.page import SEARCH_HEADERS_MOBILE
-    from shared.sx.parser import SxExpr
-    d = getattr(g, "orders_page_data", None)
-    search = d.get("search", "") if d else ""
-    search_count = d.get("search_count", "") if d else ""
-    search_mobile = await render_to_sx("search-mobile",
-        current_local_href="/",
-        search=search or "",
-        search_count=search_count or "",
-        hx_select="#main-panel",
-        search_headers_mobile=SEARCH_HEADERS_MOBILE,
-    )
-    return await render_to_sx("order-list-header", search_mobile=SxExpr(search_mobile))
-
-
-async def _h_orders_list_aside(**kw):
-    await _ensure_orders_list()
-    from quart import g
-    from shared.sx.helpers import render_to_sx
-    from shared.sx.page import SEARCH_HEADERS_DESKTOP
-    d = getattr(g, "orders_page_data", None)
-    search = d.get("search", "") if d else ""
-    search_count = d.get("search_count", "") if d else ""
-    return await render_to_sx("search-desktop",
-        current_local_href="/",
-        search=search or "",
-        search_count=search_count or "",
-        hx_select="#main-panel",
-        search_headers_desktop=SEARCH_HEADERS_DESKTOP,
-    )
-
-
-async def _h_orders_list_url(**kw):
-    await _ensure_orders_list()
-    from quart import g
-    d = getattr(g, "orders_page_data", None)
-    return d["list_url"] if d else "/"
-
-
-async def _h_order_detail_content(order_id=None, **kw):
-    await _ensure_order_detail(order_id)
-    from quart import g
-    from shared.sx.helpers import render_to_sx
-    from shared.infrastructure.urls import market_product_url
-    d = getattr(g, "order_detail_data", None)
-    if not d:
-        return ""
-
-    order = d["order"]
-    order_dict = {
-        "id": order.id,
-        "status": order.status or "pending",
-        "created_at_formatted": order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else None,
-        "description": order.description,
-        "currency": order.currency,
-        "total_formatted": f"{order.total_amount:.2f}" if order.total_amount else None,
-        "items": [
-            {
-                "product_url": market_product_url(item.product_slug),
-                "product_image": item.product_image,
-                "product_title": item.product_title,
-                "product_id": item.product_id,
-                "quantity": item.quantity,
-                "currency": item.currency,
-                "unit_price_formatted": f"{item.unit_price or 0:.2f}",
-            }
-            for item in (order.items or [])
-        ],
-    }
-
-    cal_entries = d["calendar_entries"]
-    cal_dicts = None
-    if cal_entries:
-        cal_dicts = []
-        for e in cal_entries:
-            ds = e.start_at.strftime("%-d %b %Y, %H:%M") if e.start_at else ""
-            if e.end_at:
-                ds += f" \u2013 {e.end_at.strftime('%-d %b %Y, %H:%M')}"
-            cal_dicts.append({
-                "name": e.name,
-                "state": e.state or "",
-                "date_str": ds,
-                "cost_formatted": f"{e.cost or 0:.2f}",
-            })
-
-    return await render_to_sx("order-detail-content",
-        order=order_dict,
-        calendar_entries=cal_dicts)
-
-
-async def _h_order_detail_filter(order_id=None, **kw):
-    await _ensure_order_detail(order_id)
-    from quart import g
-    from shared.sx.helpers import render_to_sx
-    d = getattr(g, "order_detail_data", None)
-    if not d:
-        return ""
-
-    order = d["order"]
-    order_dict = {
-        "status": order.status or "pending",
-        "created_at_formatted": order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else "\u2014",
-    }
-
-    return await render_to_sx("order-detail-filter-content",
-        order=order_dict,
-        list_url=d["list_url"],
-        recheck_url=d["recheck_url"],
-        pay_url=d["pay_url"],
-        csrf=d["csrf_token"])
-
-
-async def _h_order_detail_url(order_id=None, **kw):
-    await _ensure_order_detail(order_id)
-    from quart import g
-    d = getattr(g, "order_detail_data", None)
-    return d["detail_url"] if d else "/"
-
-
-async def _h_order_list_url_from_detail(order_id=None, **kw):
-    await _ensure_order_detail(order_id)
-    from quart import g
-    d = getattr(g, "order_detail_data", None)
-    return d["list_url"] if d else "/"
diff --git a/orders/sxc/pages/orders.sx b/orders/sxc/pages/orders.sx
index 4e32cff..f9851c1 100644
--- a/orders/sxc/pages/orders.sx
+++ b/orders/sxc/pages/orders.sx
@@ -1,4 +1,5 @@
 ;; Orders app — declarative page definitions
+;; All data fetching via (service ...) IO primitives, no Python helpers.
 
 ;; ---------------------------------------------------------------------------
 ;; Orders list
@@ -7,11 +8,34 @@
 (defpage orders-list
   :path "/"
   :auth :public
+  :data (service "orders-page" "list-page-data"
+          :search (or (request-arg "search") "")
+          :page (or (request-arg "page" "1") "1"))
   :layout (:orders
-    :list-url (orders-list-url))
-  :filter (orders-list-filter)
-  :aside (orders-list-aside)
-  :content (orders-list-content))
+    :list-url (str (route-prefix) (url-for "defpage_orders_list")))
+  :filter (~order-list-header
+            :search-mobile (~search-mobile
+              :current-local-href "/"
+              :search (or search "")
+              :search-count (or search-count "")
+              :hx-select "#main-panel"
+              :search-headers-mobile "{\"X-Origin\":\"search-mobile\",\"X-Search\":\"true\"}"))
+  :aside (~search-desktop
+           :current-local-href "/"
+           :search (or search "")
+           :search-count (or search-count "")
+           :hx-select "#main-panel"
+           :search-headers-desktop "{\"X-Origin\":\"search-desktop\",\"X-Search\":\"true\"}")
+  :content (let* ((pfx (route-prefix))
+                  (detail-url-raw (str pfx (url-for "defpage_order_detail" :order-id 0)))
+                  (detail-prefix (slice detail-url-raw 0 (- (length detail-url-raw) 2)))
+                  (rows-url (str pfx (url-for "orders.orders_rows"))))
+             (~orders-list-content
+               :orders orders
+               :page page
+               :total-pages total-pages
+               :rows-url rows-url
+               :detail-url-prefix detail-prefix)))
 
 ;; ---------------------------------------------------------------------------
 ;; Order detail
@@ -20,8 +44,17 @@
 (defpage order-detail
   :path "/<int:order_id>/"
   :auth :public
+  :data (service "orders-page" "detail-page-data" :order-id order-id)
   :layout (:order-detail
-    :list-url (order-list-url-from-detail order-id)
-    :detail-url (order-detail-url order-id))
-  :filter (order-detail-filter order-id)
-  :content (order-detail-content order-id))
+    :list-url (str (route-prefix) (url-for "defpage_orders_list"))
+    :detail-url (str (route-prefix) (url-for "defpage_order_detail" :order-id order-id)))
+  :filter (let* ((pfx (route-prefix)))
+            (~order-detail-filter-content
+              :order order
+              :list-url (str pfx (url-for "defpage_orders_list"))
+              :recheck-url (str pfx (url-for "orders.order.order_recheck" :order-id order-id))
+              :pay-url (str pfx (url-for "orders.order.order_pay" :order-id order-id))
+              :csrf (csrf-token)))
+  :content (~order-detail-content
+              :order order
+              :calendar-entries calendar-entries))
diff --git a/shared/services/registry.py b/shared/services/registry.py
index 0f02906..8616664 100644
--- a/shared/services/registry.py
+++ b/shared/services/registry.py
@@ -15,6 +15,8 @@ Usage::
 """
 from __future__ import annotations
 
+from typing import Any
+
 from shared.contracts.protocols import (
     CalendarService,
     MarketService,
@@ -36,6 +38,7 @@ class _ServiceRegistry:
         self._market: MarketService | None = None
         self._cart: CartService | None = None
         self._federation: FederationService | None = None
+        self._extra: dict[str, Any] = {}
 
     # -- calendar -------------------------------------------------------------
     @property
@@ -81,10 +84,27 @@ class _ServiceRegistry:
     def federation(self, impl: FederationService) -> None:
         self._federation = impl
 
+    # -- generic registration --------------------------------------------------
+    def register(self, name: str, impl: Any) -> None:
+        """Register a service by name (for services without typed properties)."""
+        self._extra[name] = impl
+
+    def __getattr__(self, name: str) -> Any:
+        # Fallback to _extra dict for dynamically registered services
+        try:
+            extra = object.__getattribute__(self, "_extra")
+            if name in extra:
+                return extra[name]
+        except AttributeError:
+            pass
+        raise AttributeError(f"No service registered as: {name}")
+
     # -- introspection --------------------------------------------------------
     def has(self, name: str) -> bool:
         """Check whether a domain service is registered."""
-        return getattr(self, f"_{name}", None) is not None
+        if getattr(self, f"_{name}", None) is not None:
+            return True
+        return name in self._extra
 
 
 # Module-level singleton — import this everywhere.
diff --git a/shared/sx/pages.py b/shared/sx/pages.py
index a1cba1d..251370f 100644
--- a/shared/sx/pages.py
+++ b/shared/sx/pages.py
@@ -184,7 +184,9 @@ async def execute_page(
     if page_def.data_expr is not None:
         data_result = await async_eval(page_def.data_expr, env, ctx)
         if isinstance(data_result, dict):
-            env.update(data_result)
+            # Merge with kebab-case keys so SX symbols can reference them
+            for k, v in data_result.items():
+                env[k.replace("_", "-")] = v
 
     # Render content slot (required)
     content_sx = await _eval_slot(page_def.content_expr, env, ctx)
diff --git a/shared/sx/primitives_io.py b/shared/sx/primitives_io.py
index 8e26854..02ad8f1 100644
--- a/shared/sx/primitives_io.py
+++ b/shared/sx/primitives_io.py
@@ -43,6 +43,8 @@ IO_PRIMITIVES: frozenset[str] = frozenset({
     "g",
     "csrf-token",
     "abort",
+    "url-for",
+    "route-prefix",
 })
 
 
@@ -345,6 +347,34 @@ async def _io_abort(
     abort(status, message)
 
 
+async def _io_url_for(
+    args: list[Any], kwargs: dict[str, Any], ctx: RequestContext
+) -> str:
+    """``(url-for "endpoint" :key val ...)`` → url_for(endpoint, **kwargs).
+
+    Generates a URL for the given endpoint.  Keyword args become URL
+    parameters (kebab-case converted to snake_case).
+    """
+    if not args:
+        raise ValueError("url-for requires an endpoint name")
+    from quart import url_for
+    endpoint = str(args[0])
+    clean = {k.replace("-", "_"): v for k, v in _clean_kwargs(kwargs).items()}
+    # Convert numeric values for int URL params
+    for k, v in clean.items():
+        if isinstance(v, str) and v.isdigit():
+            clean[k] = int(v)
+    return url_for(endpoint, **clean)
+
+
+async def _io_route_prefix(
+    args: list[Any], kwargs: dict[str, Any], ctx: RequestContext
+) -> str:
+    """``(route-prefix)`` → current route prefix string."""
+    from shared.utils import route_prefix
+    return route_prefix()
+
+
 _IO_HANDLERS: dict[str, Any] = {
     "frag": _io_frag,
     "query": _io_query,
@@ -359,4 +389,6 @@ _IO_HANDLERS: dict[str, Any] = {
     "g": _io_g,
     "csrf-token": _io_csrf_token,
     "abort": _io_abort,
+    "url-for": _io_url_for,
+    "route-prefix": _io_route_prefix,
 }