The DNSBL services are itself reachable through a rest API, both through GET and POST-queries. The calls can be made in bulks, which means if you have a host that delivers blacklists to us, you may want to post more than one address at the time. The recommended method for doing this is by a POST, but in less larger amounts of hosts GET is also accepted. There are currently no release of the DNSBL since it's in a state of test (beta/unfinished), but you may however test the services. Some calls are made available freely (at least at the moment), but they will probably get stricted up later on due to the risk of flooding of the services.