Pulp

http://pulp.readthedocs.org/en/latest/dev-guide/integration/rest-api/consumer/bind.html#retrieve-a-single-binding

As an example:

1. curl H "Accept: application/json" -H "WebFrameworkSwitch: webpy" -X GET -k -u admin:admin "https://localhost/pulp/api/v2/consumers/c1/bindings/zoo/yum_distributor/"|python -m json.tool
   % Total % Received % Xferd Average Speed Time Time Time Current
   Dload Upload Total Spent Left Speed
   100 610 100 610 0 0 982 0 -:--:-- --:--:-- --:--:-- 982
   {
   "_href": "/pulp/api/v2/consumers/c1/bindings/zoo/yum_distributor/",
   "_id": {
   "$oid": "54e4a51ca629d331857c5c77"
   },
   "_ns": "consumer_bindings",
   "binding_config": {},
   "consumer_actions": [],
   "consumer_id": "c1",
   "deleted": false,
   "details": {
   "ca_cert": null,
   "client_cert": null,
   "gpg_keys": [],
   "protocols": [
   "https"
   ],
   "relative_path": "/pulp/repos/repos/pulp/pulp/demo_repos/zoo/",
   "repo_name": "zoo",
   "server_name": "ec2-54-246-34-239.eu-west-1.compute.amazonaws.com"
   },
   "distributor_id": "yum_distributor",
   "id": "54e4a51ca629d331857c5c77",
   "notify_agent": true,
   "repo_id": "zoo",
   "type_id": "yum_distributor"
   }