# ADH US Mega-Cap Stock Signals

> ADH US Mega-Cap Stock Signals is a paid API for AI agents from agentdatum.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns momentum, volatility, z-score, and percentile-rank signals for US mega-cap equities (e.g. AAPL) derived from time-series data across 239 sources.

## Facts

- Endpoint: GET https://agentdatum.com/api/v1/d/sig-us-mega-cap
- 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/adh-us-mega-cap-stock-signals-0d9e62cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f5csl7vTR0piz7URtK3hT

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 adh-us-mega-cap-stock-signals-0d9e62cb
```

Example prompt: Pull the latest momentum, volatility, and z-score signals for US mega-cap stocks like AAPL — I want to see the percentile ranks and price history to decide if they're extended or due for a pullback.

## When to prefer this

Choose this endpoint when you need pre-computed, statistically derived signals (momentum, volatility, z-score, percentile rank) for US mega-cap equities ready to inject into an AI context — especially when you want entity-resolved, time-synchronized intelligence rather than raw price feeds. Prefer this over raw market data APIs when you need derived quantitative metrics (z-scores, percentile ranks) already computed across a 239-source data library, and when you want agent-native x402 micropayment settlement.

## Known failure modes

- Payment not received — x402 payment required before data is served
- Stale data — generated_at timestamp may lag real-time by minutes or hours
- Empty or partial signals array if upstream data sources are unavailable
- Rate limiting if payment is not settled per-call via x402
- Schema mismatch if response format changes between API versions

## How this service works

US Mega-Cap Signals — Momentum, volatility, z-score, and percentile signals for 10 US mega-caps like Apple, Microsoft, Nvidia, Tesla, with 30-day trends.

## Output

Returns a JSON object containing per-ticker signal objects for US mega-cap equities. Each signal includes: 1-day log return (ret_1), 4-period momentum (mom_4), 20-day volatility (vol_20), 10- and 30-day z-scores, 10- and 30-day percentile ranks, last price, data point count, status, and a timestamped price history array. Also includes metadata: product label, data source, data type, and generation timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "raw": {
   "method": "x402 signals: log-return momentum / volatility / z-score / percentile rank over time-series library",
   "product": "美股巨头信号",
   "signals": [
    {
     "mom_4": 0.032139,
     "ret_1": 0.00294,
     "points": 257,
     "series": "stock-quote__AAPL",
     "status": "ok",
     "vol_20": 0.02298,
     "history": [
      {
       "ts": 1782480600,
       "value": 283.779999
      },
      {
       "ts": 1782480600,
       "value": 283.779999
      }
     ],
     "zscore_10": -0.6696,
     "zscore_30": -0.1112,
     "last_value": 313.33,
     "pctrank_10": 50,
     "pctrank_30": 43.3
    },
    {
     "mom_4": 0.032139,
     "ret_1": 0.00294,
     "points": 257,
     "series": "stock-quote__AAPL",
     "status": "ok",
     "vol_20": 0.02298,
     "history": [
      {
       "ts": 1782480600,
       "value": 283.779999
      },
      {
       "ts": 1782480600,
       "value": 283.779999
      }
     ],
     "zscore_10": -0.6696,
     "zscore_30": -0.1112,
     "last_value": 313.33,
     "pctrank_10": 50,
     "pctrank_30": 43.3
    }
   ],
   "generated_at": "2026-08-14T00:22:02Z"
  },
  "source": "datum-signals",
  "data_type": "信号指标",
  "collected_at": "2026-08-14T00:22:02Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/adh-us-mega-cap-stock-signals-0d9e62cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdatum.com](https://www.zero.xyz/host/agentdatum.com/llms.txt)