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Today, we're announcing our first hosted infrastructure product: pyx, a Python-native package registry. We think of pyx as an optimized backend for uv: it’s a package registry, but it also solves problems that go beyond the scope of a traditional "package registry".

With pyx, uv becomes even faster, more secure, and hardware-aware (PyTorch, CUDA, FlashAttention, etc. become first-class citizens). You can use pyx to host private packages (it's much faster than other private registries), or as a frontend to public sources like PyPI.

Much of the inspiration for pyx comes from the classes of problems we see in the uv issue tracker that we can't solve with a client alone -- but could solve with a server. For example...

"Why is it so hard to install PyTorch, or CUDA, or libraries like FlashAttention or DeepSpeed that build against PyTorch and CUDA?"