# 4SEC Futures Open Interest by Symbol

> 4SEC Futures Open Interest by Symbol is a paid API for AI agents from api.foursec.xyz, paid per call via x402, $0.03/call, status down (last checked 2026-09-15).

Returns aggregated futures open interest for a given crypto symbol, broken down by exchange, with a total in USD.

## Facts

- Endpoint: GET https://api.foursec.xyz/futures/open-interest/%7Bsymbol%7D
- Price: $0.03/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/4sec-futures-open-interest-by-symbol-f2384788
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cJxBFS21sA6RbWYGV0hti

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 4sec-futures-open-interest-by-symbol-f2384788
```

Example prompt: What's the current futures open interest for BTC across all exchanges — give me the breakdown by exchange and the total in USD?

## When to prefer this

Use this endpoint when you need real-time, multi-exchange aggregated futures open interest for a specific crypto asset, especially when you want per-exchange breakdown and a USD total. Prefer this over spot volume endpoints when your question is about derivatives positioning rather than spot trading activity.

## Known failure modes

- Unknown or unsupported symbol returns an error or empty result
- Payment failure via x402 protocol results in a 402 Payment Required response
- Network latency or exchange data feed delays may cause stale timestamps
- Invalid symbol format (e.g. lowercase or with hyphens) may return an error

## How this service works

Real-time multi-DEX aggregated crypto market data. Pay per request with USDC on Base via x402 protocol.

## Output

A JSON object containing the queried symbol, a UTC timestamp, a breakdown of open interest by individual exchange, and the total aggregated open interest expressed in USD.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "symbol": {
   "type": "string"
  },
  "timestamp": {
   "type": "string",
   "format": "date-time"
  },
  "by_exchange": {
   "type": "object"
  },
  "total_oi_usd": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/4sec-futures-open-interest-by-symbol-f2384788/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.foursec.xyz](https://www.zero.xyz/host/api.foursec.xyz/llms.txt)