# HyperExtend HIP-4 Outcome Open Interest (Per Minute)

> HyperExtend HIP-4 Outcome Open Interest (Per Minute) is a paid API for AI agents from api.hyperextend.xyz, paid per call via x402, $0.001000/call, status unknown (last checked 2026-09-15).

Returns derived two-sided open interest data for a specified HIP-4 outcome market, sampled per minute, with optional time window and pagination.

## Facts

- Endpoint: GET https://api.hyperextend.xyz/v1/outcome/100/oi
- Price: $0.001000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hyperextend-hip-4-outcome-open-interest-per-minute-f0edaf68
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hJsWIyK_QEG9LuVFVwg8p

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability hyperextend-hip-4-outcome-open-interest-per-minute-f0edaf68
```

Example prompt: Can you pull the per-minute two-sided open interest data for HIP-4 outcome market 100 on HyperExtend? I want the last 60 records.

## When to prefer this

Use this endpoint when you need granular, per-minute open interest data specifically for HIP-4 outcome markets, particularly for monitoring market depth, analyzing two-sided exposure, or building time-series visualizations of OI trends. Prefer this over the windowed summary endpoint when you need raw minute-level resolution rather than aggregated statistics.

## Known failure modes

- Invalid or non-existent outcome market ID returns 404 or empty result
- start/end timestamps out of range return empty dataset
- limit parameter too large may be capped or return an error
- Payment not provided or insufficient USDC results in 402 Payment Required
- Malformed path parameter (non-integer outcome ID) returns 400 Bad Request

## How this service works

Derived two-sided open interest for a HIP-4 outcome market, per minute (circulating-supply times mark, summed over both sides). Priced per row ($0.000025 premium); served live. Takes the integer outcome id (e.g. 100).

## Output

Returns a time-series of derived two-sided open interest values for the specified HIP-4 outcome market, sampled at per-minute intervals. Each record includes open interest broken down by side, associated with the outcome market ID and a timestamp. Results can be paginated and filtered by start/end time.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "outcome"
     ],
     "properties": {
      "outcome": {
       "type": "string",
       "description": "HIP-4 outcome market id (integer), e.g. 100"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "end": {
       "type": "integer"
      },
      "limit": {
       "type": "integer"
      },
      "start": {
       "type": "integer"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hyperextend-hip-4-outcome-open-interest-per-minute-f0edaf68/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.hyperextend.xyz](https://www.zero.xyz/host/api.hyperextend.xyz/llms.txt)