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Notable changes to the Polymarket Perps API.
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Jun 11, 2026
Cancel responses include order IDs
Cancel responses now include oid and coid fields.
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Jun 10, 2026
Taker delay added for immediately matching orders
Added a 20ms taker delay for orders that immediately match on entry.
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Jun 9, 2026
Reduce-only orders added
Added the reduce-only field to order submission and order updates.
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Jun 8, 2026
Auto-cancel and rate-limit updates
  • Added PATCH /v1/trade/auto-cancel to arm or clear a dead man’s switch that cancels all open orders at a specified time.
  • Added GET /v1/account/auto-cancel to check the current auto-cancel status, trigger count, and daily reset time.
  • Auto-cancel is limited to 10 triggers per UTC day per account.
  • Added updateLeverage and autoCancel WebSocket post messages.
  • portfolio and balances WebSocket channels no longer push updates on every order or fill, only periodically.
  • Rate limit error messages now distinguish between ip_rate_limited, action_rate_limited, and message_rate_limited.