# SYNTHORA Open Interest

> SYNTHORA Open Interest is a paid API for AI agents from crypto-derivatives-oi.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns real-time open interest and open interest change for a specified Binance futures symbol, sourced live from Binance FAPI.

## Facts

- Endpoint: POST https://crypto-derivatives-oi.hergertsynthora.com/service
- 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/synthora-open-interest-104cde33
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ac1FllUUOOE23_8XddVO4

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 synthora-open-interest-104cde33 -d '<json body>'
```

Example prompt: What's the current open interest on BTCUSDT futures right now — I need the latest OI figure to gauge market positioning?

## When to prefer this

Choose this endpoint when you need real-time open interest data for Binance futures symbols specifically, especially in a cost-efficient micropayment context via x402. It is ideal for derivatives-focused agents that need a fast, single-symbol OI lookup without managing direct Binance API credentials.

## Known failure modes

- Invalid or unsupported symbol returns an error or empty result
- Binance API downtime or rate limiting may cause failures
- Malformed request body missing the symbol field
- Payment failure via x402 protocol prevents execution

## How this service works

Real-time open interest and OI change for any Binance futures symbol. Positioning signal for derivatives agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A JSON object containing the query timestamp (Unix ms), the requested symbol, and the current open interest value as a numeric string (e.g. 103679.944 contracts). Sourced directly from Binance Futures REST API in real time.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "crypto-derivatives-oi",
  "result": {
   "time": 1783774469314,
   "symbol": "BTCUSDT",
   "open_interest": "103679.944"
  },
  "provenance": {
   "url": "https://fapi.binance.com/fapi/v1/openInterest",
   "source": "SYNTHORA Open Interest"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-open-interest-104cde33/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from crypto-derivatives-oi.hergertsynthora.com](https://www.zero.xyz/host/crypto-derivatives-oi.hergertsynthora.com/llms.txt)