Overview
The dataset is served as plain static files over HTTPS from https://ahr999.aix4u.com. Every endpoint is read-only, needs no API key, and is returned with Access-Control-Allow-Origin: *, so you can fetch it directly from a browser. The series changes at most once per day — please cache responses instead of polling.
The data is for research, education, and observability. It is not financial advice and does not predict future returns.
Endpoints
| Method | Path | Returns |
|---|---|---|
GET | /datasets/ahr999.json | Full history as a JSON array, oldest first. |
GET | /datasets/ahr999.csv | The same rows as CSV, UTF-8, with a header row. |
Each JSON element follows the data-format contract: date, close, ma200, ahr999, quantile5y, windowKind.
Examples
Latest reading
curl -s https://ahr999.aix4u.com/datasets/ahr999.json | jq '.[-1]'A date range
curl -s https://ahr999.aix4u.com/datasets/ahr999.json \
| jq '[.[] | select(.date >= "2026-01-01" and .date <= "2026-01-31")]'Download the CSV
curl -O https://ahr999.aix4u.com/datasets/ahr999.csvFrom JavaScript
const rows = await fetch(
"https://ahr999.aix4u.com/datasets/ahr999.json",
).then((r) => r.json());
const latest = rows.at(-1);
console.log(latest.ahr999, latest.windowKind);Machine-readable discovery
/openapi.json— OpenAPI 3.1 description of both endpoints./.well-known/api-catalog— an API-catalog linkset pointing at the OpenAPI doc./llms.txtand/llms-full.txt— guidance for AI agents and crawlers.
CORS & caching
Responses are static and cross-origin readable. Because the series only changes after the daily UTC close, you can treat any response as valid for the rest of the UTC day. When you redistribute values, cite the dataset under CC BY 4.0 — see the FAQ.