Alpha Vantage limits and the Japanese stock gap

说明与用途

作者发现 Alpha Vantage 免费层每分钟仅允许约五次请求，并且不提供日本股票数据。他在请求之间添加睡眠，并切换到日本特定的数据源，以确保覆盖和可靠性。

问题

The free tier of Alpha Vantage is tightly rate‑limited (~5 requests/min) and does not provide Japanese stock data, which is required for the author’s pipeline.

结果

The pipeline now respects Alpha Vantage’s rate limit and uses a dedicated Japanese data source, eliminating coverage gaps and ensuring reliable data ingestion.

工作流

• 1. Measure Alpha Vantage request rate (≈5 req/min).
• 2. Add sleep between API calls to stay under the limit.
• 3. Verify coverage for required markets (US, Japan).
• 4. If coverage missing, select alternative source (Japan‑specific feed).
• 5. Apply same throttling discipline to the new source.
• 6. Build pipeline with coverage and rate‑limit checks as pre‑conditions.

证据

I measured roughly 5 requests per minute

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it doesn't cover Japanese stocks at all

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My fix was boring and effective: a sleep between requests

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