You can grab a copy of our API in json format from
curl https://s3.amazonaws.com/awx-public-ci-files/devel/schema.json -o reference-schema.json
this was generated via make swagger
It should be compatible with openapi spec, let us know if you run into issues
We are going to update https://ansible.readthedocs.io/projects/awx/en/latest/ with a browsable version of our API
AWX Team