jm *6á©É< é^Jáhð½Un~¨OÛÑÛLäý§L¥The blockchain is the API! Using bloom filters you can request all topic posts or limit to only posts for a specific topic. We hope to release a client eventually.
https://whatsonchain.com/tx/41089e85b107e99b8f14a0cea784dc1d9095f274e131aabcb9727a92725185ff