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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  • How billing works
  • Subscriptions
  • Pay as you go
  • Charges and Invoices
  • Manage billing
Resources

Billing

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This guide details how billing works for Hume products and how to manage billing on your account.

  • Pricing: See plans and inclusions on our pricing page.
  • Billing: Update payment methods and change plans in the billing portal.
  • Support: Questions? Email [email protected].

How billing works

Hume uses two billing models:

Billing modelApplies toHow charges work
SubscriptionTTS, EVI, and Voice features

One subscription includes all three. Each plan has included usage. Overage rates apply after you exceed included usage.

Pay as you go (credits)Expression MeasurementUsage is billed directly based on metering rules.

New accounts start on the free tier with $20 in credits.

Subscriptions

Your subscription includes access to Text-to-Speech (TTS), Speech-to-Speech (EVI), and Voice features. There is no separate pricing for TTS, EVI, or Voice features.

  • Start or change a plan in the billing portal.
  • Your billing cycle starts the day you begin a paid subscription and renews monthly on that same calendar day.
  • Included usage and plan limits reset at the start of each cycle
  • Upgrades take effect immediately; downgrades take effect at the next renewal
  • Overage billing applies when you exceed included usage; see plan rates at our pricing page

External LLM usage with EVI

  • Using Hume managed external LLMs adds supplemental usage to your bill.
  • If you use your own LLM API key or a custom language model, Hume does not charge for that LLM usage.

Pay as you go

Expression Measurement is billed usage by usage:

  • Audio and video prices are listed per minute for clarity and metered per second.
  • Images are billed per image processed.
  • Text is billed per word.

Charges and Invoices

  • Subscription renewals are charged on your monthly renewal date
  • Additional usage is charged each time you accrue $44 of usage; to change this threshold, email [email protected]
  • You receive an email receipt for successful charges and invoice PDFs are available in the Platform.

If payment fails, we will notify you and may pause API access until the outstanding balance is settled.

Manage billing

Go to Billing in the Platform: app.hume.ai/billing

  • View usage and renewal date
  • Update payment methods
  • Download invoices
  • Change plans

If you have questions, contact [email protected].