For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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OverviewAPI ReferencePre-recorded STTStreaming STTVoice AgentsSpeech UnderstandingGuardrailsLLM GatewayFAQ
OverviewAPI ReferencePre-recorded STTStreaming STTVoice AgentsSpeech UnderstandingGuardrailsLLM GatewayFAQ
  • Overview
      • Can I sign up for free?
      • Do my free credits expire?
      • Do you have any type of special pricing for non-profit companies?
      • Do you offer special pricing for start-ups?
      • Do you offer special pricing for YCombinator companies?
      • Do you offer volume discounts?
      • How do I add developers to my account?
      • How do I change my account email address?
      • How do I change the credit card associated with my account?
      • How do I update company information on my invoices?
      • How is multichannel billed?
      • How does the concurrency limit work for transcription requests?
      • How often does the Usage and Spend Information in my Dashboard update?
      • How to share account access with team members
      • Is AssemblyAI available on the AWS Marketplace?
      • What happens if I reach my concurrency limit?
      • What happens when I have used all of my free tier credits?
      • What payment methods do you accept?
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On this page
  • What Happens When You Exceed the Free Tier Limit?
  • Managing Your Account Balance
  • Resolving Negative Balance Errors
OverviewAccount, Billing & Payments

Can I sign up for free?

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Do my free credits expire?

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Yes! You can use the API for free on a limited trial. Simply add a credit card to your account at any time to upgrade from the trial.

An account on the free tier has access to Pre-recorded STT, Streaming STT, Voice Agent API, Speech Understanding, and Guardrails.

LLM Gateway is not available to accounts on the free tier.

An account on the free tier can process up to $50 in audio. If you upgrade your account before using $50 in transcription, any unused amount will be retained on your account.

Once you have used the $50 in free credits, you will need to upgrade your account to continue using the API.

What Happens When You Exceed the Free Tier Limit?

While the free tier provides $50 in credits, users often wonder what exactly happens when they reach this limit. If you attempt to use the API without sufficient account balance, you’ll receive a specific error message:

{ "error": "Your current account balance is negative. Please top up to continue using the API." }

Managing Your Account Balance

To avoid service interruptions:

  • Monitor your current balance on the Billing page of your account dashboard
  • Consider enabling autopay to automatically add funds when your balance reaches a certain threshold
  • Set up billing alerts to get notified before you run out of credits

Resolving Negative Balance Errors

If you encounter the negative balance error:

  • Go to your account’s Billing page
  • Add a payment method if you haven’t already
  • Add funds to your account or enable autopay
  • Your API access will be restored once your balance is positive

This proactive approach helps ensure uninterrupted service for your applications.