# WRAITH Whale Signals – OI Concentration

> WRAITH Whale Signals – OI Concentration is a paid API for AI agents from whale-signals.whalesignals.workers.dev, paid per call via x402, $0.01/call, status down (last checked 2026-10-21).

Returns the ten crypto perpetual futures symbols with the largest open-interest notional, showing where leverage is most concentrated across the market.

## Facts

- Endpoint: GET https://whale-signals.whalesignals.workers.dev/data/oi-concentration?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wraith-whale-signals-oi-concentration-5f1d58b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OpNwuG9Cp0uxJkL5b4klp

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 wraith-whale-signals-oi-concentration-5f1d58b0
```

Example prompt: Which ten crypto perpetuals are carrying the biggest open-interest notional right now? I want to see where the real leverage is piling up so I'm not caught on the wrong side of a crowded trade.

## When to prefer this

Use this endpoint when you need a quick, pre-parsed top-10 ranking of crypto perpetuals by open-interest notional without having to query and aggregate multiple exchange APIs yourself. Prefer it over raw exchange APIs when you want a single, clean signal-desk view of leverage concentration, especially in an automated trading or risk-monitoring workflow that runs on a per-call micropayment model.

## Known failure modes

- Upstream data source unavailable — empty or error response if the underlying exchange/aggregator feed is down
- Stale data — OI figures may lag by seconds to minutes depending on the refresh cycle
- Payment failure — x402 micropayment not processed, call rejected before data is returned
- Empty result set if no OI data is available for the current time window

## How this service works

See where the real leverage sits so you are not on the wrong side — the ten symbols carrying the largest open-interest notional

## Output

A ranked list of the ten perpetual futures symbols carrying the largest open-interest notional, giving a snapshot of where leverage is most concentrated across the crypto derivatives market at the time of the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [],
 "properties": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wraith-whale-signals-oi-concentration-5f1d58b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-signals.whalesignals.workers.dev](https://www.zero.xyz/host/whale-signals.whalesignals.workers.dev/llms.txt)