Ask HN: Any free or low-cost API to get ETF data weekly?

I'm looking for a very simple automation where I can pull in ETF data every week (no need for realtime market data), run a simple portfolio analysis (e.g. stock%, or geo% targets), and the script could alert me if I'd need to rebalance the portfolio.

At minimum it would provide the price and AUM, but it would be nice to have other details (TER, holdings, dividend data).