# SYNTHORA Market Index / Volatility Quote (Yahoo Chart)

> SYNTHORA Market Index / Volatility Quote (Yahoo Chart) is a paid API for AI agents from yahoo-index-quote.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns delayed OHLC price history and quotes for major market indices and volatility gauges (e.g. S&P 500, VIX, CBOE 10Y yield) via Yahoo Finance's chart endpoint.

## Facts

- Endpoint: POST https://yahoo-index-quote.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-market-index-volatility-quote-yahoo-chart-2e30e141
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ufjCyBnlZQ5qyIvSCnHwN

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-market-index-volatility-quote-yahoo-chart-2e30e141 -d '<json body>'
```

Example prompt: Can you pull the VIX volatility index OHLC data for the past month using 1-day intervals so I can assess current market risk sentiment?

## When to prefer this

Choose this endpoint when you need quick, keyless access to OHLC history or delayed quotes for major market indices and volatility gauges (^GSPC, ^VIX, ^TNX, etc.) without managing Yahoo Finance API credentials. Ideal for risk-sentiment agents, macro dashboards, and autonomous workflows that need broad-market benchmark data at low cost ($0.001/call via x402).

## Known failure modes

- Invalid or unsupported symbol (e.g. non-index ticker) returns empty or error result
- Unsupported range/interval combination may yield no data
- Yahoo Finance upstream rate limiting or downtime causes failure
- Malformed request body missing required fields returns error
- Stale or delayed data may not reflect real-time prices

## How this service works

Delayed quote and OHLC history for major indices and gauges such as the S&P 500 (^GSPC), VIX (^VIX) and CBOE 10Y yield (^TNX) from Yahoo's keyless chart endpoint (JSON). Serves autonomous risk-sentiment agents and agent-to-agent macro dashboards tracking broad-market benchmarks. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A JSON object with an 'ok' boolean, a 'niche' identifier ('yahoo-index-quote'), and a 'result' object containing OHLC price history, timestamps, and quote data for the requested index symbol and time range, sourced from Yahoo Finance's chart endpoint.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "yahoo-index-quote",
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-market-index-volatility-quote-yahoo-chart-2e30e141/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from yahoo-index-quote.hergertsynthora.com](https://www.zero.xyz/host/yahoo-index-quote.hergertsynthora.com/llms.txt)