# Prediction Market Open Interest Time-Series by Exchange

> Prediction Market Open Interest Time-Series by Exchange is a paid API for AI agents from d2ngmd5yvdfkqu.cloudfront.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns a time-series of prediction-market open interest bucketed by exchange in USD over a specified time range.

## Facts

- Endpoint: GET https://d2ngmd5yvdfkqu.cloudfront.net/open-interest
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prediction-market-open-interest-time-series-by-exchange-89866717
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RvvMVmnHueEusk7iDxgGT

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 prediction-market-open-interest-time-series-by-exchange-89866717
```

Example prompt: Show me the prediction market open interest broken down by exchange from January 1, 2025 to January 31, 2025 with 3600000 millisecond (1-hour) buckets.

## When to prefer this

Use this endpoint when you need historical or recent open-interest data specifically for prediction markets, broken down by exchange, in a time-bucketed format. Prefer it over general crypto open-interest endpoints when the focus is on event/prediction markets (e.g. Kalshi, Polymarket) rather than traditional derivatives exchanges.

## Known failure modes

- Missing required query params (from, to, interval) returns a 400 Bad Request
- Invalid ISO-8601 timestamps return a parsing or validation error
- Interval value of 0 or negative may cause a 400 or unexpected behavior
- Date range too large may time out or return an empty dataset
- Payment not provided or insufficient returns a 402 Payment Required

## How this service works

Time-series of prediction-market open interest by exchange (USD).

## Output

A time-series array of open interest values denominated in USD, bucketed by the specified interval and broken down per prediction-market exchange, covering the requested date range.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "from",
      "to",
      "interval"
     ],
     "properties": {
      "to": {
       "type": "string",
       "description": "UTC end timestamp in ISO-8601 format."
      },
      "from": {
       "type": "string",
       "description": "UTC start timestamp in ISO-8601 format."
      },
      "interval": {
       "type": "string",
       "description": "Bucket size in milliseconds."
      }
     }
    }
   },
   "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/prediction-market-open-interest-time-series-by-exchange-89866717/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from d2ngmd5yvdfkqu.cloudfront.net](https://www.zero.xyz/host/d2ngmd5yvdfkqu.cloudfront.net/llms.txt)