# SYNTHORA Open Interest Oracle

> SYNTHORA Open Interest Oracle is a paid API for AI agents from openinterest.hergertsynthora.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns live perpetual futures open interest, funding rates, mark price, premium, and crowded long/short signals for 230+ assets via Hyperliquid

## Facts

- Endpoint: POST https://openinterest.hergertsynthora.com/service
- Price: $0.05/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-oracle-37d4a0ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yBE-fb9kYl1PhXSpWgnrg

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-oracle-37d4a0ef -d '<json body>'
```

Example prompt: What's the current open interest, funding rate, mark price, and crowded long/short signal for ETH on Hyperliquid perps right now?

## When to prefer this

Use this endpoint when you need real-time perpetual futures market microstructure data — specifically open interest, funding rates, and crowding signals — sourced from Hyperliquid for 230+ assets. Prefer over generic market data APIs when you need Ed25519-signed trustworthy data and Hyperliquid-specific perp metrics like premium and crowded long/short signals.

## Known failure modes

- Unknown asset symbol returns error or empty result
- Hyperliquid data feed unavailable causes service error
- Invalid asset format (e.g. lowercase or unsupported token) may return no data
- Network timeout on Hyperliquid upstream
- Payment failure via x402 protocol results in 402 response

## How this service works

Live perpetual-futures open interest, funding rates, mark price, premium and crowded long/short signal for 230+ assets, sourced from Hyperliquid. Ed25519-signed. Pay-per-use via x402 USDC on Base.

## Output

Returns Ed25519-signed JSON containing open interest, funding rate, mark price, premium, and a crowded long/short signal for the requested asset (or top-10 assets by open interest if no asset is specified), sourced from Hyperliquid perpetuals data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "asset": {
   "type": "string",
   "description": "Perp symbol e.g. BTC, ETH, SOL. Omit for top-10 by OI"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "open_interest",
  "result": {
   "asset": "BTC",
   "signal": "neutral",
   "signed": "ed25519",
   "mark_price": 97500,
   "funding_rate": 0.0000125,
   "open_interest_usd": 2260000000
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-open-interest-oracle-37d4a0ef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openinterest.hergertsynthora.com](https://www.zero.xyz/host/openinterest.hergertsynthora.com/llms.txt)