# Financial Data x402 – Crypto Correlation

> Financial Data x402 – Crypto Correlation is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-11).

Returns the statistical correlation between a given cryptocurrency and the QQQ benchmark index over a 90-day window, including interpretation and sample size.

## Facts

- Endpoint: GET https://x402financialdata.com/crypto-correlation/%7Bsymbol%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/financial-data-x402-crypto-correlation-dff6c1ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1i7thfNb5xvgBgX34-l4E

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 financial-data-x402-crypto-correlation-dff6c1ac
```

Example prompt: What's the current 90-day correlation between ETH and QQQ — is it a strong positive relationship or are they diverging?

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call (no API key or subscription) statistical correlation between a specific cryptocurrency and the QQQ equity benchmark. Ideal for agents performing portfolio analysis, macro regime detection, or risk assessment without a standing data subscription. Prefer over general financial data APIs when you need crypto-to-equity correlation specifically and want micro-payment billing via x402/USDC.

## Known failure modes

- Unknown or unsupported crypto symbol returns an error or null data
- Payment of $0.01 USDC not completed results in HTTP 402 response
- Network issues on Base or Solana blockchain may delay payment settlement
- Insufficient historical data for a newly listed token may reduce sample size or return null
- Malformed symbol path parameter returns a 400 or 404 error

## How this service works

Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.

## Output

A JSON object containing: the crypto symbol and its CoinGecko ID, the benchmark used (QQQ), the 90-day correlation coefficient (e.g. 0.5124), a human-readable interpretation (e.g. 'moderate positive'), the sample size of observations, the as-of timestamp, and an optional note field.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "days": 90,
  "note": null,
  "as_of": "2026-08-09T12:00:00Z",
  "symbol": "ETH",
  "benchmark": "QQQ",
  "correlation": 0.5124,
  "sample_size": 62,
  "coingecko_id": "ethereum",
  "interpretation": "moderate positive"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/financial-data-x402-crypto-correlation-dff6c1ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402financialdata.com](https://www.zero.xyz/host/x402financialdata.com/llms.txt)