# Crest Open Interest — Perpetual Symbol OI from Binance Futures

> Crest Open Interest — Perpetual Symbol OI from Binance Futures is a paid API for AI agents from data.crestsystems.ai, paid per call via x402, $0.002000/call, status down (last checked 2026-09-15).

Returns the current open interest (in contracts) for a given perpetual futures symbol from Binance Futures.

## Facts

- Endpoint: GET https://data.crestsystems.ai/data/open-interest/:symbol
- Price: $0.002000/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/data-crestsystems-ai-86aa26f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tvAY4ynzUZR7t4DEXnde3

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 data-crestsystems-ai-86aa26f0
```

Example prompt: What's the current open interest in contracts for BTC perpetuals on Binance Futures?

## When to prefer this

Use this endpoint when you need real-time open interest data for a specific crypto perpetual symbol from Binance Futures. Prefer this over generic market data endpoints when you specifically need OI in contract units from Binance. Best for derivatives traders and analysts tracking market positioning.

## Known failure modes

- Invalid or unsupported symbol — no perpetual contract found on Binance Futures for the given ticker
- Symbol not listed on Binance Futures — returns error or empty result
- Network/upstream timeout from Binance Futures API
- Payment of 0.002 USDC required per call via x402; missing payment returns 402 error

## How this service works

Crest · open_interest — Fetch open interest for any perpetual futures symbol. Returns current OI in contracts and USD from Binance Futures.

## Output

Returns the current open interest (number of contracts) for the specified perpetual futures symbol sourced from Binance Futures. Typically includes the symbol and OI value in contracts.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "symbol": "BTC"
  }
 }
}
```

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "symbol"
     ],
     "properties": {
      "symbol": {
       "type": "string",
       "description": "Token symbol (e.g. BTC, ETH, SOL)"
      }
     }
    }
   },
   "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/data-crestsystems-ai-86aa26f0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data.crestsystems.ai](https://www.zero.xyz/host/data.crestsystems.ai/llms.txt)