Billing

Learn how Mithril calculates your bill and charges you.

Introduction

This overview explains how billing works for both Pay-As-You-Go (PAYG) and invoice models for our usage-based compute and inference products. All customers who sign-up after August 3rd, 2025 will be enrolled in the PAYG model by default.

All compute, storage, and inference spend is added to your balance and billed according to the PAYG or invoice models. Billing is at the organization level — spend from all projects & users accrue to the balance.

All organizations must have a valid payment method on file to use Mithril Compute. After the first 10 complimentary inference jobs, a valid payment method is needed to continue using Mithril Inference. All payment methods may have temporary authorization charges placed for verification.

Pay-as-you-go (PAYG)

Under the PAYG model, you are automatically charged at the end of the calendar month, and when your balance surpasses your spend threshold. By default your spend threshold is set at $1,000 — when your balance in a month exceeds that threshold, we automatically charge the default payment method on file.

Mithril will automatically raise your spend threshold over time based on your usage and history of successful payments. If you’d like to increase it sooner, just contact us at [email protected].

Example 1: No spend threshold met

Suppose your total spend on compute and inference in a calendar month is $700. At the end of the calendar month, you will automatically be charged $700 to cover your balance and be sent a detailed receipt. Since no spend threshold was met, there were no intermediate payments.

Example 2: Spend threshold met twice

Suppose on Day 7 of a month you surpass $1,000 of spend. Mithril will automatically charge your default payment method then. On Day 25, you surpass an additional $1,000 of spend ($2,000 cumulative for the month) — you will be automatically charged again. At the end of the month, you will be charged for any outstanding spend and receive a detailed receipt with your month's spend and intermediate payments.

Please ensure your preferred payment method is set as default in your billing configuration in Stripe. If your default method is a card, you will be charged a 2.9% card fee to cover processing fees.

Invoice

If you meet invoicing requirements, Mithril will send an invoice of your balance at the end of a calendar month. Invoices can be paid with ACH or wire transfer. To convert from PAYG to invoicing, please contact [email protected] for eligibility.

Compute Billing

Spot

Spot spend is calculated based on the actual running hours of spot compute multiplied by the market price. The market price dynamically changes based on the Spot auction mechanics. We calculate at a millisecond level to ensure market price changes and your spot instance usage is captured; spend is added to your balance in realtime. We do not start charge for your instance to start — i.e., billing begins when the instance is Running — and we do not charge when your instance is paused or pre-empted.

Reservations

Reservation spend is calculated based on the total duration of the reservation (or extension) multiplied by the reservation price. The entire cost of a reservation is added to your balance when you confirm or extend a reservation. Reservation prices are provided in the API or console as you create/extend one, or by a member of the Mithril team for long term reservations.

Storage

Storage spend is calculated based on the disks you have provisioned at $0.08/GB/month. For example, if you create 3 disks, each 3TB, the monthly cost would be 3 disks x 3072 GB x $0.08/GB = $737.28. This amount will be added to your balance at the end of the calendar month. If the disk is provisioned for a portion of a month, it will be prorated accordingly. You will be billed regardless of the actual usage of the disk

Inference Billing

Batch inference

Batch inference spend is calculated based on the number of input and output tokens processed with the specified model's input / output token pricing. For example, if a job had 1M input tokens and 2.5M output tokens on a model that was priced at $0.50/M input tokens and $1.00/M output tokens, you would pay 1 x $0.50 + 2.5 x $1.00 = $3.00 . Batch inference spend is added to your balance when a job successfully completes.

Your organization's first 10 batch jobs are free to help you get started!

Credits

You can view the remaining credits on your account under Settings > Credits. Credits are automatically applied to your balance.

Common questions

How do I view my balance?

We are providing the ability for adminstrators to view their balance soon. Spot spend can be viewed in Instances > Spot bids by order, and Reservation spend can be viewed in Instances > Reservations. If you have any questions on your balance, reach out to [email protected]

I am unable to use Compute due to a payment / billing error.

A valid payment method and billing address must be on file to spin up compute. Please ensure you have both in the Stripe Billing portal.

I'm being charged too many times in a month!

We would be happy to increase your spend thresholds — please reach out to [email protected] to do so.