Nixflex - AI Voice Platform for Building AI Phone Agents

Set a pre-call webhook that Nixflex calls before the AI answers, so you can screen or route the call. Configured per phone number (or per agent).

Set the pre-call webhook (per number)

string

required

The phone number in E.164 format, passed in the URL.

string

required

Your pre-call webhook endpoint. Must be an https URL.

curl -X PUT "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://your-app.com/precall"}'

Per agent

The same shape is available per agent at /integrations/precall/agent/:agentId.

Check / remove

curl -X GET "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"

curl -X DELETE "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"

Notes

The number must belong to your account. A number you do not own returns 404.
For how the pre-call gate works, see Pre-call gate.

API

Platform API

Pre-call gate

Set the pre-call webhook (per number)

Per agent

Check / remove

Notes

​Set the pre-call webhook (per number)

​Per agent

​Check / remove

​Notes

Set the pre-call webhook (per number)

Per agent

Check / remove

Notes