Get current HIP-4 open interest

{ "success": true, "data": { "coin": "#0", "symbol": "#0", "outcome_id": 0, "side": 0, "timestamp": "2026-05-02T20:27:21Z", "open_interest": "568048", "mark_price": "0.6502", "mid_price": "0.65038" }, "meta": { "count": 123, "next_cursor": "<string>", "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a" } }

Authorizations

X-API-Key

string

header

required

API key for authentication. Get yours at https://0xarchive.io/dashboard

Path Parameters

symbol

string

required

HIP-4 coin id (e.g., 0 for outcome 0 Yes side, 1 for No side). The #-prefixed form (#0, #1) is also accepted.

Example:

"0"

Response

Current open interest

API response wrapping a single HIP-4 per-side open-interest record

success

boolean

Example:

true

data

object

HIP-4 per-side open-interest record. Mirrors the HIP-3 OI shape and adds outcome_id and side. oracle_price is omitted for HIP-4 (outcomes have no oracle feed). Note: mark_price is an implied probability in [0,1], not a USD price; same field name as perps because Hyperliquid upstream uses markPx for both.

Hide child attributes

data.coin

string

required

#-prefixed per-side coin identifier

Example:

"#0"

data.symbol

string

required

Same value as coin. Provided for consistency with other venues.

Example:

"#0"

data.outcome_id

integer<int64>

required

Numeric outcome identifier

Example:

0

data.side

enum<integer>

required

Side index: 0 = Yes, 1 = No

Available options:

0,

1

Example:

0

data.timestamp

string<date-time>

required

Snapshot timestamp (UTC)

Example:

"2026-05-02T20:27:21Z"

data.open_interest

string

required

Open interest in contracts (notional currency: USDH)

Example:

"568048"

data.mark_price

string | null

Implied probability in [0,1], NOT a USD price. Same field name as perps because Hyperliquid upstream uses markPx for both.

Example:

"0.6502"

data.mid_price

string | null

Mid price (probability in [0,1])

Example:

"0.65038"