# Alpha Vantage Monthly Time Series via Locus x402

> Alpha Vantage Monthly Time Series via Locus x402 is a paid API for AI agents from alphavantage.x402.paywithlocus.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-13).

Returns monthly OHLCV (open, high, low, close, volume) stock price history for a given ticker symbol, paid per-call via USDC micropayment.

## Facts

- Endpoint: POST https://alphavantage.x402.paywithlocus.com/alphavantage/time-series-monthly
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alpha-vantage-monthly-time-series-via-locus-x402-b1971ff3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Si1_I3aPH5AQJ63ZOivYc

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 alpha-vantage-monthly-time-series-via-locus-x402-b1971ff3 -d '<json body>'
```

Example prompt: Can you pull the monthly historical stock price data for Apple — ticker AAPL — and give me the open, high, low, close, and volume for each month going back as far as available?

## When to prefer this

Choose this endpoint when you need long-term monthly granularity stock price history (OHLCV) for a single equity ticker, especially in agentic or automated workflows where pay-per-call USDC micropayments are acceptable and no long-term subscription is desired. Prefer this over daily or intraday endpoints when the use case involves trend analysis, backtesting over years, or charting multi-year performance.

## Known failure modes

- Invalid or unrecognized ticker symbol returns an empty or error data object
- Missing symbol parameter results in a request failure
- Payment not authorized or insufficient USDC balance causes a 402 Payment Required response
- Rate limits or upstream Alpha Vantage API downtime may produce timeout or error responses
- Requesting a delisted or OTC ticker may return incomplete or no data

## How this service works

Financial market data — stock prices, forex, crypto, commodities, economic indicators, technical analysis, and news sentiment.

## Output

A JSON object containing a monthly time series keyed by date, with open, high, low, adjusted close, and volume fields for each month, plus payment settlement metadata (settled USDC, authorized USDC) and a request ID for tracking.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "symbol": {
   "type": "string"
  },
  "datatype": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "payment": {
   "scheme": "exact",
   "settledUsdc": "0.001000",
   "authorizedMaxUsdc": "0.001000"
  },
  "request": {
   "id": "00000000-0000-4000-8000-000000000000",
   "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
  },
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/alpha-vantage-monthly-time-series-via-locus-x402-b1971ff3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alphavantage.x402.paywithlocus.com](https://www.zero.xyz/host/alphavantage.x402.paywithlocus.com/llms.txt)