Nixflex - AI Voice Platform for Building AI Phone Agents

Zapier and Make let you push call data into thousands of other apps without writing code. Both are configured per phone number. They support post-call delivery; Make additionally supports an in-call action tool the AI can call mid-conversation.

Modes

Post-call (Zapier and Make): after a call ends, Nixflex sends the full call data to your webhook. Your scenario then does whatever you build — create a CRM record, add a spreadsheet row, send a notification.
In-call action (Make only): the AI calls your Make scenario during the call and uses the response live (for example, looking something up and reading it back). Zapier cannot return a synchronous response, so in-call is Make only.

Zapier — post-call

Create a Catch Hook trigger (Webhooks by Zapier) and copy its URL, then:

curl -X PUT https://api.nixflex.com/v1/integrations/zapier/number/+447700900123 \
  -H "Authorization: Bearer KEY_ID:KEY_SECRET" \
  -H "Content-Type: application/json" \
  -d '{ "post_call_url": "https://hooks.zapier.com/hooks/catch/XXX/YYY" }'

post_call_url is required and must be https://. Read returns post_call_url_set: true (the URL itself is not returned); DELETE removes it:

curl https://api.nixflex.com/v1/integrations/zapier/number/+447700900123 -H "Authorization: Bearer KEY_ID:KEY_SECRET"
curl -X DELETE https://api.nixflex.com/v1/integrations/zapier/number/+447700900123 -H "Authorization: Bearer KEY_ID:KEY_SECRET"

Make — post-call and/or in-call

Make accepts a post-call URL, an in-call URL, or both. At least one is required.

curl -X PUT https://api.nixflex.com/v1/integrations/make/number/+447700900123 \
  -H "Authorization: Bearer KEY_ID:KEY_SECRET" \
  -H "Content-Type: application/json" \
  -d '{
    "post_call_url": "https://hook.make.com/XXXXraw",
    "in_call_url": "https://hook.make.com/YYYYraw",
    "tool_name": "lookup_order",
    "tool_description": "Look up an order by number and return its status.",
    "parameters": {
      "type": "object",
      "properties": { "order_number": { "type": "string" } },
      "required": ["order_number"]
    }
  }'

post_call_url — fires after the call (same as Zapier).
in_call_url — the AI calls this during the call. Your Make scenario must end with a Webhook Response module returning JSON; the AI uses that response live. tool_name, tool_description, and parameters describe the tool to the AI so it knows what it does and what to send.

For in-call to work, build your Make scenario with a Custom Webhook trigger and a Webhook Response at the end. Write a clear tool_description — the AI decides when to call the tool based on it. Read returns which URLs are set plus the tool fields:

{ "phone_number": "+447700900123", "is_active": true, "post_call_url_set": true, "in_call_url_set": true, "tool_name": "lookup_order", "tool_description": "...", "parameters": { ... } }

DELETE removes the Make config:

curl -X DELETE https://api.nixflex.com/v1/integrations/make/number/+447700900123 -H "Authorization: Bearer KEY_ID:KEY_SECRET"

What gets sent (post-call)

Post-call delivery uses the same reliable engine as Webhooks — it retries on failure and stops on a bad URL. Your scenario receives the full call data: summary, sentiment, outcome, caller number, call details, transcript, and any extracted data.

Connect via dashboard

Prefer the dashboard? Go to Integrations → Zapier (or Make), pick the agent and number, paste the webhook URL(s), and Save.

Tips

Test your Zap or scenario with one real call before relying on it.
For Make in-call tools, keep the scenario fast — the AI waits for the response during the call (5 second limit).
Each number is independent — different numbers can trigger different scenarios via per-number setup.

Integrations

Calendar

Messaging

CRM

Automation

Telephony

Zapier & Make

Modes

Zapier — post-call

Make — post-call and/or in-call

What gets sent (post-call)

Connect via dashboard

Tips

​Modes

​Zapier — post-call

​Make — post-call and/or in-call

​What gets sent (post-call)

​Connect via dashboard

​Tips

Modes

Zapier — post-call

Make — post-call and/or in-call

What gets sent (post-call)

Connect via dashboard

Tips