Hey Andrew,

Sorry to hear you're hitting this 404 snag while trying to pull historical stock symbol data for your portfolio backtesting—this kind of historical data is critical for getting accurate backtest results! Let's walk through what might be happening and what you can do next:

Possible Causes for the 404 Error #

• Endpoint Deprecation or Refactoring: API providers often retire older endpoints as they update their services. The /symbol-sync/{date}.csv endpoint might have been phased out and replaced with a new interface—maybe one that uses query parameters for date filtering instead of embedding dates directly in the URL path, or integrates symbol history into a broader data endpoint.
• Shift to Paid Service: StockTwits does offer premium data tiers alongside free access. If this endpoint was previously free, it’s possible it’s been moved to a paid plan. That said, reputable providers usually send advance notifications to registered developers for this kind of change.

Next Steps to Fix This #

• Check Official Developer Resources: Log into your StockTwits developer account and head to their documentation portal or developer blog. Look for recent announcements about deprecated endpoints or service updates—this is where they’ll post official details on changes.
• Review Account Notifications: Check your email (linked to your developer account) and any in-platform messages from StockTwits. They might have sent alerts about the endpoint being retired before the 404 errors started.
• Contact Developer Support: If you can’t find clear info on your own, reach out to StockTwits’ developer support team. Be sure to mention your use case (portfolio backtesting) and the exact endpoint you were using—they should be able to confirm if it’s been discontinued, moved to a paid tier, or suggest a suitable replacement.
• Temporary Workaround: While sorting this out, you might need to source historical stock symbol data from alternative compliant sources that fit your backtesting needs. Just make sure any data you use aligns with the provider’s licensing terms.

内容的提问来源于stack exchange，提问作者adonoho