# Ask the vendor in writing

Lesson 3 of [Compare AI voice agent vendors before you buy](https://voiceagents.fyi/academy/compare-ai-voice-agent-vendors.md), 15 minutes.

Send the same questions to every vendor, in writing. Put the answers side by side. A vendor that cannot answer a question clearly is giving you an answer. Question groups - Cost. What is the total cost per minute at our volume? Which costs are passed through at cost? Which monthly fees apply outside…

The rest of this lesson is for learners enrolled in the course. [See how Compare AI voice agent vendors before you buy works](https://voiceagents.fyi/academy/compare-ai-voice-agent-vendors.md).

Also on the [web page](https://voiceagents.fyi/academy/compare-ai-voice-agent-vendors/ask-the-vendor-in-writing).