If you are looking for products, there are plenty of tools out there that will work. I have used WSO2 Governance Registry in the past with good results.
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There is no such service I know of.
Besides, I don't know of any usable UDDI repository, too.
If you are looking for standards, the SOA Repository Artifact Model and Protocol is basically a REST-ful replacement for UDDI. It is based upon the AtomPub protocol.
If you are looking for products, there are plenty of tools out there that will work. I have used WSO2 Governance Registry in the past with good results.