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POST
perpsAtOpenInterestCap | Hyperliquid Info API

Credit Cost

1 per call

Processing

Realtime
The Hyperliquid info endpoint with type: "perpsAtOpenInterestCap" is used to list the perp assets currently at their open-interest cap.
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  • Wire-equal to POST api.hyperliquid.xyz/info with {"type": "perpsAtOpenInterestCap"}.
  • While an asset is in this list it has reached its open-interest cap; orders that would increase aggregate open interest are rejected (see the openInterestCap* order-rejection reasons) until open interest falls back below the cap.
  • This is a global, non-user-keyed type refreshed continuously from upstream Hyperliquid.
Returns the list of perpetual assets that are currently at their open-interest cap, as an array of coin symbol strings. Use it to detect which markets are constrained before placing orders that would add open interest.

Endpoint

Request

string
required
Always "perpsAtOpenInterestCap".

Example

Response

An array of coin symbol strings for the perp assets currently at their open-interest cap. Empty when no market is capped.

Field descriptions

string
Coin symbol of a perp asset currently at its open-interest cap.
Last reviewed: 2026-07-24