# Currency Time Series - OpenWebNinja x402

> Currency Time Series - OpenWebNinja x402 is a paid API for AI agents from x402.openwebninja.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns historical exchange rate time series data for a currency pair over a specified period, including rate snapshots and change metrics.

## Facts

- Endpoint: GET https://x402.openwebninja.com/realtime-finance-data/currency-time-series
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/currency-time-series-openwebninja-x402-9734db6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h08kJGoXu1QVrLFyPuhJ8

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 currency-time-series-openwebninja-x402-9734db6c
```

Example prompt: Can you pull the historical exchange rate time series for EUR to USD over the last 6 months, including the daily rate snapshots and percent changes?

## When to prefer this

Use this endpoint when you need historical exchange rate data for a specific currency pair over a defined time period, with per-timestamp rate snapshots and change metrics. Prefer this over spot-rate endpoints when trend analysis, charting, or historical comparison is needed.

## Known failure modes

- Invalid or unsupported ISO 4217 currency code returns an error or empty result
- Invalid period value (not one of 1D, 5D, 1M, 6M, YTD, 1Y, 5Y, MAX) may return an error
- Payment not provided or insufficient USDC returns HTTP 402
- Rate limiting or quota exceeded may return an error
- Unsupported language code may default to English or return an error

## How this service works

40+ public web-data, SERP, e-commerce, real-estate, finance and AI-search APIs, payable per call over x402 (USDC on Base, Polygon, Arbitrum). No account or API key required. Most endpoints $0.003; AI-model endpoints $0.005.

## Output

A structured object containing a time series of exchange rate snapshots keyed by timestamp, each with the exchange rate, absolute change from previous close, and percent change. Also includes metadata like the currency pair symbols, period, and interval information.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/currency-time-series-openwebninja-x402-9734db6c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.openwebninja.com](https://www.zero.xyz/host/x402.openwebninja.com/llms.txt)