TexasCoding · TexasCoding · Jul 4, 2026 · Jul 4, 2026 · Jul 4, 2026 · Jul 4, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,64 @@
 
 All notable changes to kalshi-sdk will be documented in this file.
 
+## 6.0.0 — 2026-07-04
+
+Syncs the upstream OpenAPI/AsyncAPI specs **3.22.0 → 3.23.0** (#463). The
+headline change is **breaking**: Kalshi removed the multivariate lookup-history
+endpoint from the spec, so the SDK removes the corresponding method and model.
+Every other change is additive and backward-compatible.
+
+### Removed (breaking)
+
+- **`lookup_history()`** on `client.multivariate_collections` (sync + async) and
+  the **`LookupPoint`** model (no longer exported from `kalshi` /
+  `kalshi.models`). Upstream removed the backing `GET
+  /multivariate_event_collections/{collection_ticker}/lookup` operation
+  (`GetMultivariateEventCollectionLookupHistory`) and the `LookupPoint` schema in
+  3.23.0 — the endpoint now 404s. The `lookup_tickers()` sibling (the `PUT` on the
+  same path) is unaffected.
+
+### Added
+
+- **`ApiKey.subaccount`**, **`CreateApiKeyRequest.subaccount`**,
+  **`GenerateApiKeyRequest.subaccount`** (`int | None`) — when set, restricts the
+  API key to a single subaccount. `api_keys.create()` / `generate()` (sync +
+  async) accept a `subaccount` kwarg that threads into the body. The request
+  models bound it to the spec's `0-63` range (`ge=0, le=63`) client-side; the
+  response model stays permissive.
+- **`ApplySubaccountTransferRequest.exchange_index`** (`int | None`) — exchange
+  shard to apply the transfer on (spec `ExchangeIndex`; defaults to 0).
+- **`SubaccountTransfer`** additive fields: `exchange_index` and `transfer_type`
+  (`"cash"`/`"position"`, both required), plus the position-transfer-only
+  `market_ticker` / `side` (`"yes"`/`"no"`) / `count` / `price_cents`.
+- **`MarginPosition.is_portfolio`** and **`MarginRiskPosition.is_portfolio`**
+  (`bool`, required) — true when the position is hedged within a portfolio.
+- **`MarginOrder.order_reason`** (`"liquidation"`/`"take_profit_stop_loss"`,
+  optional) — reason for a system-generated order.
+- **`MarketLifecyclePayload.price_ranges`** (WS `market_lifecycle_v2`) — valid
+  price bands emitted alongside `price_level_structure`.
+- **`subaccounts.transfer_position(...)`** (sync + async) — new
+  `POST /portfolio/subaccounts/positions/transfer` endpoint (spec 3.23.0): moves
+  an open **position** (contracts) between subaccounts, distinct from the
+  cash-only `transfer()`. Returns `ApplySubaccountPositionTransferResponse`
+  (`position_transfer_id`). New models `ApplySubaccountPositionTransferRequest` /
+  `ApplySubaccountPositionTransferResponse` are exported from `kalshi` /
+  `kalshi.models`.
+- **`subaccounts.create(exchange_index=...)`** — `POST /portfolio/subaccounts`
+  gained an optional `CreateSubaccountRequest` body (spec 3.23.0); `create()`
+  now accepts an optional `exchange_index` to target a specific exchange shard.
+  New `CreateSubaccountRequest` model exported from `kalshi` / `kalshi.models`.
+
+### Fixed
+
+- **Defensive optional-ization of fields 3.23.0 removed/relaxed.** The drift
+  suite is spec→SDK only, so a field the spec drops but the SDK still *requires*
+  is a latent `ValidationError` if the server stops emitting it. Three such
+  fields are now `... | None = None`:
+  - `Market.fractional_trading_enabled` (removed from spec),
+  - `MarketPosition.resting_orders_count` (removed from spec),
+  - `MarginPosition.margin_used` (relaxed from required to optional).
+
 ## 5.0.1 — 2026-06-27
 
 Spec-drift catch-up (#460). Kalshi added fields to the `ExchangeStatus` schema

diff --git a/CLAUDE.md b/CLAUDE.md
@@ -122,7 +122,7 @@ tests/
 
 ## API Reference
 
-- OpenAPI spec: https://docs.kalshi.com/openapi.yaml (v3.22.0, 101 operations)
+- OpenAPI spec: https://docs.kalshi.com/openapi.yaml (v3.23.0, 101 operations)
 - AsyncAPI spec: https://docs.kalshi.com/asyncapi.yaml (13 WebSocket channels)
 - Base URL: https://api.elections.kalshi.com/trade-api/v2
 - Demo URL: https://demo-api.kalshi.co/trade-api/v2

diff --git a/README.md b/README.md
@@ -11,7 +11,7 @@ A professional, spec-first Python SDK for the [Kalshi](https://kalshi.com) predi
 [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Type checked: mypy strict](https://img.shields.io/badge/mypy-strict-blue.svg)](https://mypy.readthedocs.io/)
 
-- **Full coverage** of the Kalshi REST API (101 operations across 19 resources, OpenAPI v3.22.0) and WebSocket API (12 typed `subscribe_*` channels + 2 escape-hatch).
+- **Full coverage** of the Kalshi REST API (101 operations across 19 resources, OpenAPI v3.23.0) and WebSocket API (12 typed `subscribe_*` channels + 2 escape-hatch).
 - **Perps (margin) API**: standalone `PerpsClient` / `AsyncPerpsClient` + `PerpsWebSocket` for the perpetual-futures exchange (34 REST operations, 6 WS channels), plus a `KlearClient` for the Self-Clearing-Member "Klear" settlement API (9 operations). See [Perps (margin) trading](#perps-margin-trading).
 - **FIX protocol**: an async-first FIX engine (FIXT.1.1 / FIX50SP2) for both products — order-entry, drop-copy, market-data, post-trade (prediction), and RFQ (prediction) sessions (plus order-group management over the order-entry session) with typed message models, sequence recovery, and order-book / settlement reassembly. `from kalshi import FixClient` / `MarginFixClient`. See [FIX protocol](#fix-protocol-low-latency-trading).
 - **V2 event-market orders**: `create_v2` / `amend_v2` / `decrease_v2` / `cancel_v2` plus batched variants on `/portfolio/events/orders/*` — the only order-write surface.

diff --git a/ROADMAP.md b/ROADMAP.md
@@ -2,6 +2,27 @@
 
 ## Shipped
 
+- **v6.0.0 (2026-07-04)** — OpenAPI sync v3.22.0 → v3.23.0 (#463). **Breaking:**
+  removed the multivariate lookup-history endpoint (`lookup_history()` +
+  `LookupPoint`), deleted upstream. Additive: subaccount-scoped API keys
+  (`api_keys.create/generate(subaccount=)`), subaccount **position** transfers
+  (`subaccounts.transfer_position()` + models), `subaccounts.create(exchange_index=)`,
+  and new response fields on `SubaccountTransfer`, `MarginOrder`,
+  `MarginPosition` / `MarginRiskPosition` (`is_portfolio`), and the WS
+  `market_lifecycle_v2` payload (`price_ranges`). Defensive optional-ization of
+  three fields the spec removed/relaxed (#464, #465 folded in).
+- **v5.0.1 (2026-06-27)** — spec-drift catch-up (#460): additive `ExchangeStatus`
+  fields (`intra_exchange_transfers_active`, `exchange_index_statuses` +
+  `ExchangeIndexStatus`).
+- **v5.0.0 (2026-06-26)** — OpenAPI sync v3.21.0 → v3.22.0 (#454, #458).
+  **Breaking:** removed the V1 order-write endpoints/models (use the `*_v2`
+  family); added RFQ-scoped quote actions.
+- **v4.2.0 (2026-06-19)** — in-place spec-drift reconciliation (#451): additive
+  fields the live OpenAPI/AsyncAPI specs gained after 4.1.0.
+- **v4.1.0 (2026-06-14)** — OpenAPI sync v3.20.0 → v3.21.0: additive new query
+  params, response fields, and four new endpoints.
+- **v4.0.0 (2026-06-09)** — spec-drift reconciliation against OpenAPI 3.20.0
+  (#443); one breaking change on the Self-Clearing-Member (Klear) surface.
 - **v3.3.0 (2026-06-06)** — complete **FIX protocol** subsystem (FIXT.1.1 /
   FIX50SP2) for both products: `FixClient` (prediction) + `MarginFixClient`
   (margin) over a hand-rolled async session engine, with five session types

diff --git a/docs/index.md b/docs/index.md
@@ -3,7 +3,7 @@
 A professional, spec-first Python SDK for the [Kalshi](https://kalshi.com) prediction
 markets API.
 
-- **Full REST coverage** — 101 operations across 19 resources (OpenAPI v3.22.0),
+- **Full REST coverage** — 101 operations across 19 resources (OpenAPI v3.23.0),
   every kwarg drift-tested against the spec.
 - **V2 event-market orders** — new `create_v2` / `amend_v2` / `decrease_v2` /
   `cancel_v2` family on `/portfolio/events/orders/*`. Legacy `/portfolio/orders`

diff --git a/docs/migration.md b/docs/migration.md
@@ -1,5 +1,31 @@
 # Migration
 
+## v5 → v6.0.0
+
+**Breaking: multivariate lookup-history is gone.** Kalshi removed the
+`GET /multivariate_event_collections/{ticker}/lookup` endpoint
+(`GetMultivariateEventCollectionLookupHistory`) and the `LookupPoint` schema from
+the OpenAPI spec in 3.23.0, so the SDK removed the matching method and model.
+
+### Removed
+
+| Removed (v5)                                        | Replacement |
+| --------------------------------------------------- | ----------- |
+| `multivariate_collections.lookup_history(...)` (sync + async) | none — the endpoint was deleted upstream |
+| `LookupPoint` model (exported from `kalshi` / `kalshi.models`) | none |
+
+Everything else in 6.0.0 is additive and needs no code changes:
+
+- New optional/required response fields on `ApiKey`, `SubaccountTransfer`,
+  `MarginPosition`, `MarginRiskPosition`, `MarginOrder`, and the WS
+  `market_lifecycle_v2` payload.
+- New `subaccounts.transfer_position(...)` method (`POST
+  /portfolio/subaccounts/positions/transfer`) for moving open positions between
+  subaccounts.
+- `subaccounts.create()` gained an optional `exchange_index` argument.
+
+See the [changelog](../CHANGELOG.md) for the full list.
+
 ## v4 → v5.0.0
 
 **Breaking: the V1 order-write API is gone.** Kalshi removed the V1 order
@@ -402,16 +428,14 @@ for position in client.portfolio.positions_all():
 
 ### Multivariate endpoints emit `DeprecationWarning`
 
-Per #269, `multivariate.lookup_tickers`, `multivariate.lookup_history`,
-and `multivariate.create_market` (sync + async) carry
-`@typing_extensions.deprecated` decorators citing the spec's "should
-not be used for new integrations" guidance. Use RFQs instead. The
-endpoints still work; calls just emit a `DeprecationWarning` on first
-use.
+Per #269, `multivariate.lookup_tickers` and `multivariate.create_market`
+(sync + async) carry `@typing_extensions.deprecated` decorators citing
+the spec's "should not be used for new integrations" guidance. Use RFQs
+instead. The endpoints still work; calls just emit a `DeprecationWarning`
+on first use.
 
-`multivariate.lookup_history` also now validates `lookback_seconds`
-locally against the spec enum `{10, 60, 300, 3600}` and raises
-`ValueError` for any other value before the round trip.
+(`multivariate.lookup_history`, also deprecated here in #269, was removed
+entirely in 6.0.0 — see the [v5 → v6.0.0](#v5--v600) section above.)
 
 ### `orders.list(event_ticker=...)` accepts lists
 

diff --git a/docs/perps.md b/docs/perps.md
@@ -99,6 +99,12 @@ Orders create/cancel/decrease/amend are POSTs/DELETEs and are **never retried**.
 - **Subaccounts** (since the v3.21.0 spec sync) — `MarginPosition` (the
   `portfolio.positions()` rows) carries a **required** `subaccount` (`int`)
   identifying which subaccount holds the position.
+- **Portfolio hedging** (since the v3.23.0 spec sync) — `MarginPosition` and
+  `MarginRiskPosition` carry a **required** `is_portfolio` (`bool`), `True` when
+  the position is hedged within a portfolio so its margin is computed at the
+  portfolio level. `MarginOrder` gained an optional `order_reason`
+  (`"liquidation"` / `"take_profit_stop_loss"`) identifying system-generated
+  orders.
 
 ## Funding mechanics
 

diff --git a/docs/reference.md b/docs/reference.md
@@ -68,8 +68,12 @@ every exception class.
 
 ::: kalshi.models.order_groups.UpdateOrderGroupLimitRequest
 
+::: kalshi.models.subaccounts.CreateSubaccountRequest
+
 ::: kalshi.models.subaccounts.ApplySubaccountTransferRequest
 
+::: kalshi.models.subaccounts.ApplySubaccountPositionTransferRequest
+
 ::: kalshi.models.subaccounts.UpdateSubaccountNettingRequest
 
 ## Response models

diff --git a/docs/resources/api-keys.md b/docs/resources/api-keys.md
@@ -10,10 +10,16 @@ Auth required throughout (you need an existing key to manage keys).
 | Method | Endpoint |
 |---|---|
 | `list()` | `GET /api_keys` |
-| `create(*, name, public_key, scopes=None)` | `POST /api_keys` |
-| `generate(*, name, scopes=None)` | `POST /api_keys/generate` |
+| `create(*, name, public_key, scopes=None, subaccount=None)` | `POST /api_keys` |
+| `generate(*, name, scopes=None, subaccount=None)` | `POST /api_keys/generate` |
 | `delete(api_key)` | `DELETE /api_keys/{api_key}` |
 
+!!! note "Subaccount-scoped keys (spec v3.23.0)"
+    Pass `subaccount=<0-63>` to `create()` / `generate()` to restrict a key to a
+    single subaccount. Omit it (the default) for an account-wide key. The value is
+    bounded to `0-63` client-side; `ApiKey.subaccount` echoes it back on `list()`
+    (`None` for account-wide keys).
+
 ## List
 
 ```python

diff --git a/docs/resources/multivariate.md b/docs/resources/multivariate.md
@@ -9,12 +9,17 @@ Public listing, auth-required minting. Attribute name on the client:
 `multivariate_collections`.
 
 !!! warning "Deprecated methods"
-    `create_market()`, `lookup_tickers()`, and `lookup_history()` are
-    deprecated — "This endpoint predates RFQs and should not be used for new
-    integrations." Calling them emits a `DeprecationWarning`. Use the
+    `create_market()` and `lookup_tickers()` are deprecated — "This endpoint
+    predates RFQs and should not be used for new integrations." Calling them
+    emits a `DeprecationWarning`. Use the
     [Communications (RFQ/Quote)](communications.md) surface instead. `list()` /
     `list_all()` / `get()` remain supported.
 
+!!! danger "Removed in 6.0.0"
+    `lookup_history()` and the `LookupPoint` model were removed — Kalshi deleted
+    the backing `GET /multivariate_event_collections/{ticker}/lookup` endpoint
+    from the spec in 3.23.0.
+
 ## Quick reference
 
 | Method | Endpoint | Auth |
@@ -23,7 +28,6 @@ Public listing, auth-required minting. Attribute name on the client:
 | `get(collection_ticker)` | `GET /multivariate_event_collections/{ticker}` | no |
 | `create_market(collection_ticker, *, selected_markets, with_market_payload=False)` | `POST /multivariate_event_collections/{ticker}` | yes |
 | `lookup_tickers(collection_ticker, *, selected_markets)` | `PUT /multivariate_event_collections/{ticker}/lookup` | yes |
-| `lookup_history(collection_ticker, *, lookback_seconds)` | `GET /multivariate_event_collections/{ticker}/lookup` (with `lookback_seconds` query param) | no |
 
 ## List collections
 
@@ -77,17 +81,6 @@ if resp.market is not None:
     print(resp.market.yes_bid, resp.market.yes_ask)
 ```
 
-## Recent lookup history
-
-```python
-history = client.multivariate_collections.lookup_history(
-    "KXWEATHER-SPORTS-COMBO",
-    lookback_seconds=3600,
-)
-for point in history:
-    print(point.last_queried_ts, point.market_ticker, point.event_ticker)
-```
-
 ## Reference
 
 ::: kalshi.resources.multivariate.MultivariateCollectionsResource

diff --git a/docs/resources/subaccounts.md b/docs/resources/subaccounts.md
@@ -7,8 +7,9 @@ primary; `1`–`63` are numbered extras. Auth required throughout.
 
 | Method | Endpoint |
 |---|---|
-| `create()` | `POST /portfolio/subaccounts` |
+| `create(*, exchange_index=None)` | `POST /portfolio/subaccounts` |
 | `transfer(*, client_transfer_id, from_subaccount, to_subaccount, amount_cents)` | `POST /portfolio/subaccounts/transfer` |
+| `transfer_position(*, client_transfer_id, from_subaccount, to_subaccount, market_ticker, side, count, price_cents)` | `POST /portfolio/subaccounts/positions/transfer` |
 | `list_balances()` | `GET /portfolio/subaccounts/balances` |
 | `list_transfers(*, cursor=None, limit=None)` | `GET /portfolio/subaccounts/transfers` |
 | `list_all_transfers(*, limit=None, max_pages=None)` | walks `list_transfers` |
@@ -20,31 +21,54 @@ primary; `1`–`63` are numbered extras. Auth required throughout.
 ```python
 resp = client.subaccounts.create()
 print(resp.subaccount_number)
+
+# Or target a specific exchange shard (spec v3.23.0; defaults to 0):
+resp = client.subaccounts.create(exchange_index=0)
 ```
 
-The body is intentionally empty — the SDK sends `json={}` to force a JSON
-content-type so demo doesn't reject the call.
+With no `exchange_index` the SDK sends `json={}` (an empty
+`CreateSubaccountRequest`) to force a JSON content-type so demo doesn't reject
+the call.
 
-## Transfer between subaccounts
+## Transfer cash between subaccounts
 
 `amount_cents` is **integer cents**. `client_transfer_id` is a UUID — the
-idempotency key for the transfer:
+idempotency key for the transfer. `transfer()` returns `None` (the endpoint's
+response body is empty); list transfers to reconcile:
 
 ```python
 import uuid
 
-resp = client.subaccounts.transfer(
+client.subaccounts.transfer(
     client_transfer_id=uuid.uuid4(),     # or str
     from_subaccount=0,                   # primary
     to_subaccount=1,
     amount_cents=500,                    # $5.00
 )
-print(resp.transfer_id)
 ```
 
 `client_transfer_id` accepts a `UUID` or a `str`. On a network failure, retry
-with the same id; the server dedupes. List transfers to reconcile (see
-below).
+with the same id; the server dedupes.
+
+## Transfer a position between subaccounts
+
+Spec v3.23.0 added `transfer_position()` for moving open contracts (not cash)
+between subaccounts. Unlike `transfer()`, it returns a
+`position_transfer_id`. `price_cents` (0–100) sets the cost basis on the
+destination:
+
+```python
+resp = client.subaccounts.transfer_position(
+    client_transfer_id=uuid.uuid4(),     # or str
+    from_subaccount=0,
+    to_subaccount=1,
+    market_ticker="KXBTC-25DEC31-B100000",
+    side="yes",                          # "yes" | "no"
+    count=10,                            # contracts (> 0)
+    price_cents=55,                      # per-contract cents, 0–100
+)
+print(resp.position_transfer_id)
+```
 
 ## List balances
 

diff --git a/kalshi/__init__.py b/kalshi/__init__.py
@@ -38,6 +38,8 @@
     Announcement,
     ApiKey,
     ApiUsageLevelGrant,
+    ApplySubaccountPositionTransferRequest,
+    ApplySubaccountPositionTransferResponse,
     ApplySubaccountTransferRequest,
     AssociatedEvent,
     Balance,
@@ -65,6 +67,7 @@
     CreateQuoteResponse,
     CreateRFQRequest,
     CreateRFQResponse,
+    CreateSubaccountRequest,
     CreateSubaccountResponse,
     DailySchedule,
     DecreaseOrderV2Request,
@@ -109,7 +112,6 @@
     IncentiveProgramTypeLiteral,
     IndexedBalance,
     LiveData,
-    LookupPoint,
     LookupTickersForMarketInMultivariateEventCollectionRequest,
     LookupTickersResponse,
     MaintenanceWindow,
@@ -201,6 +203,8 @@
     "Announcement",
     "ApiKey",
     "ApiUsageLevelGrant",
+    "ApplySubaccountPositionTransferRequest",
+    "ApplySubaccountPositionTransferResponse",
     "ApplySubaccountTransferRequest",
     "AssociatedEvent",
     "AsyncBlockTradeProposalsResource",
@@ -236,6 +240,7 @@
     "CreateQuoteResponse",
     "CreateRFQRequest",
     "CreateRFQResponse",
+    "CreateSubaccountRequest",
     "CreateSubaccountResponse",
     "DailySchedule",
     "DecreaseOrderV2Request",
@@ -306,7 +311,6 @@
     "KlearClient",
     "KlearConfig",
     "LiveData",
-    "LookupPoint",
     "LookupTickersForMarketInMultivariateEventCollectionRequest",
     "LookupTickersResponse",
     "MaintenanceWindow",
@@ -375,4 +379,4 @@
     "Withdrawal",
 ]
 
-__version__ = "5.0.1"
+__version__ = "6.0.0"