Current EPSG.io endpoints will be deprecated after 1st of February 2025: https://epsg.io/docs#migration
You can replace them with a new endpoint from MapTiler, you just need to get an API key. You can get it and start using the Free plan which covers up to 100K requests monthly.
More extensive documentation: https://documentation.maptiler.com/hc/en-us/articles/360020950098-How-to-migrate-from-EPSG-io-to-MapTiler-Coordinates-API