Purchase credits and pay for what you consume across all models and products. Manage your credits in Portal Billing.Inworld offers four APIs: TTS, STT, Router (LLM), and Realtime API (Speech to Speech). You only pay for the underlying model usage each API consumes, with no markup on any product.
Your credit balance is displayed at the top of the Billing page. Credits are consumed by API and Playground usage across all products (TTS, LLM, STT).
Add credits — Click Add credits to purchase more. The minimum purchase is $10. You will be redirected to a secure checkout page, and credits are applied immediately upon payment.
Auto-reload — Enable auto-reload to automatically purchase credits when your balance falls below a threshold you set. Configure the reload amount and threshold from the Billing page.
Negative balance — You may temporarily exceed your credit balance due to billing delays. Any overage is subtracted from your next credit purchase.
Enterprise accounts are billed per their agreement. The credit purchase UI is not available for enterprise plans.
Speech-to-Text is available via both the standalone STT API and the Realtime API. Usage is billed based on audio duration.
Model
Provider
Price
Whisper Large v3
Groq
$0.111/hour
Universal-Streaming Multilingual
AssemblyAI
$0.15/hour
Universal-Streaming English
AssemblyAI
$0.15/hour
Universal3 RT Pro
AssemblyAI
$0.45/hour
Whisper RT
AssemblyAI
$0.30/hour
These are example STT models and rates. For a complete and up-to-date list of all supported STT models and pricing, see the Pricing page or contact sales.
When you route LLM requests through Inworld, you pay the provider’s listed cost with no markup. Using Inworld’s Agent Runtime SDK is free — you only pay for model consumption.See the Pricing page for a full breakdown of LLM model rates across all supported providers.
