Cartesia Line vs Telnyx Voice AI Agents

Cartesia Line and Telnyx Voice AI Agents are both Realtime Voice Agent APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. Telnyx Voice AI Agents starts lower at $0.05 per minute vs $0.06 for Cartesia Line. Cartesia Line offers a free tier while Telnyx Voice AI Agents does not, so Cartesia Line is easier to trial before committing. For coding-agent use, Telnyx Voice AI Agents scores higher on agent-friendliness (80 vs 55).

Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

Data last verified 2026-06-21, with every field cited on each profile.

Head-to-head, from published, cited fields (auto-generated; no paid placement)
Field	Cartesia Line	Telnyx Voice AI Agents
Starting price	$0.06 minute	$0.05 minute
Pricing model	Hybrid	Usage
Free tier	✓	✗
Self-serve signup	✓	✓
SOC 2	Type II	Type II
HIPAA	✓	✓
GDPR	✓	✓
Webhooks	✓	✓
Sandbox	✗	✗
Documented actions	25	26

Full data and citations: Cartesia Line · Telnyx Voice AI Agents. See more Realtime Voice Agent APIs.