Public API for physical properties Is there a publicly available API that serves physical property data for organic molecules?

Pubchem does not serve properties, ChemSpider closes property access to API calls, and Toxnet only serves html.  Im basically looking for a free programmatic interface to the kind of info in a CRC handbook. Thanks for any suggestions.
ChEMBL database provides API access: https://www.ebi.ac.uk/chembl/ws
properties can be retrieved from the 'molecule' endpoint, for example aspirin:

https://www.ebi.ac.uk/chembl/api/data/molecule/CHEMBL25.json

Disclaimer: I'm the author of this API.