# SYNTHORA open_interest

> SYNTHORA open_interest is a paid API for AI agents from open-interest.hergertsynthora.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Returns real-time BTC open interest, funding rates, and mark prices for machine-to-machine risk engine consumption via a signed x402 micropayment call.

## Facts

- Endpoint: POST https://open-interest.hergertsynthora.com/service
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-open-interest-eb2226be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-ITxQAnTn-8CE3wx-V1cg

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-eb2226be -d '<json body>'
```

Example prompt: Pull the latest BTC open interest, funding rate, and mark price from SYNTHORA for my risk engine — it's a signed x402 call at 0.03 USDC on Base.

## When to prefer this

Choose this endpoint when your M2M risk engine or trading system needs low-cost, real-time BTC derivatives metrics (open interest, funding rate, mark price) via a micropayment-gated x402 API on Base. Ideal for automated pipelines that need fresh data per-call at $0.03 per request rather than a subscription model.

## Known failure modes

- Insufficient USDC balance on Base — payment rejected, no data returned
- Invalid or missing x402 signature — authentication failure
- Upstream market data unavailable — empty result object returned
- Network timeout reaching open-interest.hergertsynthora.com
- Malformed input string — request rejected with error

## How this service works

Real-time BTC open interest, funding, and mark prices for M2M risk engines. Signed x402 call. 0.03 USDC on Base.

## Output

A JSON object containing a success flag, the niche identifier ('open_interest'), a result object with real-time BTC open interest, funding rates, and mark prices, plus a payment receipt confirming the 0.03 USDC x402 transaction on Base.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "string",
   "description": "Real-time BTC open interest, funding, and mark prices for M2M risk engines. Signed x402 call. 0.03 USDC on Base."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "open_interest",
  "result": {},
  "receipt": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-open-interest-eb2226be/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from open-interest.hergertsynthora.com](https://www.zero.xyz/host/open-interest.hergertsynthora.com/llms.txt)