What's free
$10 in free credits plus 20 free concurrent calls — voice-agent orchestration (STT + LLM + TTS)
Rate limits
20 free concurrent calls; voice agents ~$0.07-$0.31/min after the credit
The catch
$10 signup credit with full platform access. A voice-agent builder (orchestration), not a raw model API. Card terms not stated on the pricing page.