Kerux
Call any API
Send a contact to Sendspark, Clay or your own backend in the middle of a flow.
Automations
Automations that wait for the answer
A branching canvas for LinkedIn, email and WhatsApp, where any step can call another service, wait for that contact's own answer and continue with it. Call, listen and continue in one flow.
Listen for the answer
Each contact waits for its own data, matched by its callback link or a rule, then moves on.
Branch on anything
Replied, accepted, a field from the answer: split the flow and keep going.