Pricing

Cartesia meters model usage in credits and agent usage in agent dollars. Every subscription plan includes a monthly credit allotment. See cartesia.ai/pricing for current plans and included credits. Credits are only used by successful requests; errors will not consume credits.

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At a glance

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Agents

Cartesia’s hosted Line voice agents are billed per minute in US dollars. This does not affect your credit balance.

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Text-to-speech

Standard TTS costs approximately 1 credit per character. The exact number of credits can vary slightly due to transcript pre-processing. This applies to every TTS endpoint: /tts/bytes, /tts/sse, and /tts/websocket.

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Speech-to-text

STT pricing depends on the model and whether you use the batch or realtime endpoint. Silence is also included, even if no transcript is produced.

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Infill

Infill generates audio that bridges two existing clips. Each request costs a fixed 300 credits, plus the standard TTS rate applied to the infill transcript.

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Check your usage

You can check your usage on the usage page and view your current balance on the subscription page. Additionally, you can use the credit usage and agent usage API to check usage programmatically. This requires creating an admin API key.