# SundayFactoryX Derivatives Market Data API

> SundayFactoryX Derivatives Market Data API is a paid API for AI agents from api.sundayfactoryx.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns derivatives market data (e.g. futures, options, funding rates, open interest) for a specified crypto asset (SOL, BTC, or ETH) via a pay-per-call x402 micropayment model.

## Facts

- Endpoint: GET https://api.sundayfactoryx.com/v1/market/derivatives
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sundayfactoryx-derivatives-market-data-api-f42e72d6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ySdv0sWSNoYMaIlDYFuPb

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 sundayfactoryx-derivatives-market-data-api-f42e72d6
```

Example prompt: Pull the latest derivatives market data for ETH from SundayFactoryX — I want to see funding rates, open interest, and any relevant signals.

## When to prefer this

Choose this endpoint when your agent needs real-time or near-real-time crypto derivatives market data (funding rates, open interest, futures/options signals) for BTC, ETH, or SOL, and is operating in a pay-per-call micropayment architecture using x402 on Base. It is well-suited for autonomous trading agents, DeFi research pipelines, or risk-monitoring bots that need lightweight, on-demand data without a subscription. Prefer it over subscription APIs when call frequency is low or cost-per-call economics are preferred.

## Known failure modes

- HTTP 402 returned if x402 payment challenge is not fulfilled (expected flow — requires x402-aware client to complete payment)
- Invalid or unsupported asset symbol returns an error (only SOL, BTC, ETH accepted)
- Network or upstream data provider outage may return 5xx error
- Stale or unavailable market data may result in incomplete response fields
- Payment rejected or underfunded wallet causes failed authentication

## How this service works

Pay-per-call (x402) market-data + research API for autonomous agents. Paid endpoints return HTTP 402 with an x402 v2 payment challenge; pay in USDC on Base with any x402-aware client.

## Output

A JSON object containing derivatives market data for the requested asset (SOL, BTC, or ETH), likely including metrics such as funding rates, open interest, perpetual futures prices, options data, and/or proprietary market signals. The response schema is open-ended (generic object), so specific fields may vary. The call requires a $0.01 USDC micropayment via x402 on Base before data is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "asset": {
   "enum": [
    "SOL",
    "BTC",
    "ETH"
   ],
   "type": "string",
   "description": "one of: SOL|BTC|ETH"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sundayfactoryx-derivatives-market-data-api-f42e72d6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sundayfactoryx.com](https://www.zero.xyz/host/api.sundayfactoryx.com/llms.txt)