Update Polymarket documentation - April 9, 2026

Changes:
- Changelog: Added Apr 9, 2026 entry - GET /markets: closed defaults to false
- list-markets.md: Updated to reflect closed=false default on the 'closed' query parameter
- New endpoint: Added get-batch-prices-history.md (POST /batch-prices-history)
- TARGET.md: Added new get-batch-prices-history.md URL

TARGET.md

@@ -184,6 +184,7 @@ https://docs.polymarket.com/api-reference/markets/get-market-by-id.md
 https://docs.polymarket.com/api-reference/markets/get-market-tags-by-id.md
 https://docs.polymarket.com/api-reference/markets/get-market-by-slug.md
 https://docs.polymarket.com/api-reference/markets/get-prices-history.md
+https://docs.polymarket.com/api-reference/markets/get-batch-prices-history.md
 https://docs.polymarket.com/api-reference/markets/get-sampling-markets.md
 https://docs.polymarket.com/api-reference/markets/get-simplified-markets.md
 https://docs.polymarket.com/api-reference/markets/get-sampling-simplified-markets.md

docs/api-reference/markets/get-batch-prices-history.md

@@ -0,0 +1,140 @@
+< > ## Documentation Index
+> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
+> Use this file to discover all available pages before exploring further.
+
+# Get batch prices history
+
+> Retrieve historical price data for multiple markets in a single request.
+
+
+
+## OpenAPI
+
+````yaml /api-spec/clob-openapi.yaml post /batch-prices-history
+openapi: 3.1.0
+info:
+  title: Polymarket CLOB API
+  description: Polymarket CLOB API Reference
+  license:
+    name: MIT
+    identifier: MIT
+  version: 1.0.0
+servers:
+  - url: https://clob.polymarket.com
+    description: Production CLOB API
+  - url: https://clob-staging.polymarket.com
+    description: Staging CLOB API
+security: []
+tags:
+  - name: Trade
+    description: Trade endpoints
+  - name: Markets
+    description: Market data endpoints
+  - name: Account
+    description: Account and authentication endpoints
+  - name: Notifications
+    description: User notification endpoints
+  - name: Rewards
+    description: Rewards and earnings endpoints
+  - name: Rebates
+    description: Maker rebate endpoints
+paths:
+  /batch-prices-history:
+    post:
+      tags:
+        - Markets
+      summary: Get batch prices history
+      description: Retrieve historical price data for multiple markets in a single request.
+      operationId: getBatchPricesHistory
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/BatchPricesHistoryRequest'
+      responses:
+        '200':
+          description: Successful response with price history for each market
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/BatchPricesHistoryResponse'
+        '400':
+          description: Bad Request - Missing or invalid parameters
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorResponse'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorResponse'
+      security: []
+components:
+  schemas:
+    BatchPricesHistoryRequest:
+      type: object
+      required:
+        - markets
+      properties:
+        markets:
+          type: array
+          items:
+            type: string
+          description: List of market asset ids to query. Maximum 20.
+          maxItems: 20
+        start_ts:
+          type: number
+          format: double
+          description: Filter by items after this unix timestamp (seconds).
+        end_ts:
+          type: number
+          format: double
+          description: Filter by items before this unix timestamp (seconds).
+        interval:
+          type: string
+          enum:
+            - max
+            - all
+            - 1m
+            - 1w
+            - 1d
+            - 6h
+            - 1h
+          description: Time interval for data aggregation.
+        fidelity:
+          type: integer
+          description: Accuracy of the data expressed in minutes. Default is 1 minute.
+    BatchPricesHistoryResponse:
+      type: object
+      properties:
+        history:
+          type: object
+          additionalProperties:
+            type: array
+            items:
+              $ref: '#/components/schemas/MarketPrice'
+          description: Map of market asset id to array of price data points.
+    ErrorResponse:
+      type: object
+      required:
+        - error
+      properties:
+        error:
+          type: string
+          description: Error message
+    MarketPrice:
+      type: object
+      properties:
+        t:
+          type: integer
+          format: uint32
+        p:
+          type: number
+          format: float
+
+````
+
+Built with [Mintlify](https://mintlify.com).

docs/api-reference/markets/list-markets.md

@@ -159,6 +159,7 @@ paths:
           in: query
           schema:
             type: boolean
+            default: false
       responses:
         '200':
           description: List of markets
@@ -972,10 +973,6 @@ components:
           type: string
           format: date-time
           nullable: true
-        updatedAt:
-          type: string
-          format: date-time
-          nullable: true
     Tag:
       type: object
       properties:
@@ -1003,10 +1000,6 @@ components:
           type: string
           format: date-time
           nullable: true
-        updatedAt:
-          type: string
-          format: date-time
-          nullable: true
         forceHide:
           type: boolean
           nullable: true
@@ -1100,10 +1093,6 @@ components:
           type: string
           format: date-time
           nullable: true
-        updatedAt:
-          type: string
-          format: date-time
-          nullable: true
         commentsEnabled:
           type: boolean
           nullable: true
@@ -1230,10 +1219,6 @@ components:
           type: string
           format: date-time
           nullable: true
-        updatedAt:
-          type: string
-          format: date-time
-          nullable: true
         commentsEnabled:
           type: boolean
           nullable: true

docs/changelog/changelog.md

@@ -1,4 +1,4 @@
-> ## Documentation Index
+< > ## Documentation Index
 > Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
 > Use this file to discover all available pages before exploring further.
 
@@ -6,6 +6,10 @@
 
 > Welcome to the Polymarket Changelog. Here you will find any important changes to Polymarket, including but not limited to CLOB, API, UI and Mobile Applications.
 
+<Update label="Apr 9, 2026" description="GET /markets: closed defaults to false">
+  * **`closed` default change**: The `closed` query parameter on `GET /markets` now defaults to `false`. Closed markets are excluded from results unless you explicitly pass `closed=true`.
+</Update>
+
 <Update label="Mar 31, 2026" description="REST API Fee Fields Update">
   * **Fee calculation source**: Fees should now be calculated using the `feeSchedule` object within a market.
 </Update>
@@ -108,7 +112,7 @@
 </Update>
 
 <Update label="July 23, 2025" description="Get Book(s) update">
-  * We’re adding new fields to the `get-book` and `get-books` CLOB endpoints to include key market metadata that previously required separate queries.
+  * We're adding new fields to the `get-book` and `get-books` CLOB endpoints to include key market metadata that previously required separate queries.
     * `min_order_size`
       * type: string
       * description: Minimum price increment.
@@ -121,7 +125,7 @@
 </Update>
 
 <Update label="June 3, 2025" description="New Batch Orders Endpoint">
-  * We’re excited to roll out a highly requested feature: **order batching**. With this new endpoint, users can now submit up to five trades in a single request. To help you get started, we’ve included sample code demonstrating how to use it. Please see [Create Orders](/trading/orders/create) for more details.
+  * We're excited to roll out a highly requested feature: **order batching**. With this new endpoint, users can now submit up to five trades in a single request. To help you get started, we've included sample code demonstrating how to use it. Please see [Create Orders](/trading/orders/create) for more details.
 </Update>
 
 <Update label="June 3, 2025" description="Change to /data/trades">
@@ -136,7 +140,7 @@
 </Update>
 
 <Update label="May 28, 2025" description="New FAK Order Type">
-  We’re excited to introduce a new order type soon to be available to all users: Fill and Kill (FAK). FAK orders behave similarly to the well-known Fill or Kill (FOK) orders, but with a key difference:
+  We're excited to introduce a new order type soon to be available to all users: Fill and Kill (FAK). FAK orders behave similarly to the well-known Fill or Kill (FOK) orders, but with a key difference:
 
   * FAK will fill as many shares as possible immediately at your specified price, and any remaining unfilled portion will be canceled.
   * Unlike FOK, which requires the entire order to fill instantly or be canceled, FAK is more flexible and aims to capture partial fills if possible.
@@ -155,5 +159,4 @@
   * DELETE /order - 3000 every 10 minutes (5/s) - Throttle requests over the maximum configured rate
 </Update>
 
-
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