Billing | Hume API

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

How billing works

Hume uses two billing models:

Billing model	Applies to	How charges work
Subscription	TTS, 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 Measurement	Usage is billed directly based on metering rules.

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

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.

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.

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 billing@hume.ai
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.

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

If you have questions, contact billing@hume.ai.