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Pria runs on a credit-based billing model: Praxis Unified Credits are purchased through Stripe — for yourself, or for a Digital Twin you administer — and consumed as people interact with Pria. This page covers how billing works, where it lives in the platform, and how to manage payment methods, invoices, and subscriptions.

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Billing model overview

Every interaction with Pria consumes tokens. For ordinary turns Pria converts tokens into credits at one rate, whatever the model; multi-agent turns, voice minutes and very long inputs are priced from the model’s real cost.

One credit = 10,000 tokens

The default conversion ratio. Both input and output tokens count toward the total.

Cached tokens cost less

When a provider serves part of a prompt from its prompt cache, part of the provider’s caching saving is passed on as a discount on those tokens.
The discount that caching provides is shown on every interaction in the Usage Details panel under each reply and in the Discount column of Admin → Histories, so you can verify the realized savings on a per-call basis.
For a deeper walkthrough of token math, caching, and how credits are calculated for any single interaction, see Plans & Credits.

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Where billing lives

Billing decisions are made at three scopes — but money only flows in at one of them.
Accounts hold a balance for organizations that operate several Digital Twins. It is funded by the Praxis AI team (and by credits released back from Digital Twins) and distributed to Digital Twins by transfer.
Each Digital Twin tracks its own credit balance. When Pool Credits is enabled on the Digital Twin, all member interactions draw from this balance instead of from individual users.
Individual users keep a personal credit balance that funds activity in their personal Pria and in any Digital Twin where credit pooling is turned off.
Purchases are made by a person: for themselves, or — by its admins — for a Digital Twin that pools credits. Account balances are not bought through Stripe; contact the Praxis AI team at humans@praxis-ai.com to fund an Account. See Credit Allocation & Transfers.

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One-time credit purchases

One-time purchases use Stripe Checkout and are the most common way to top up credits.
1

Open the credits gallery

From your profile, choose Add Credits (Add credits in the Studio UI). The gallery shows the Personal and Volume ladders; while you are in a Digital Twin that pools credits, its admins buy for the Digital Twin.
2

Pick a package

Larger packages unlock progressively better per-credit pricing. Credits never expire.
3

Complete checkout

Stripe handles card capture, 3-D Secure, tax, and receipts. On success, the credits are applied immediately and a Stripe receipt is emailed.

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Subscriptions

Subscriptions deliver a recurring credit allotment on a fixed cadence. They are intended for Accounts that want predictable monthly or annual spend, and for the Named User Subscription model where total credits scale with population size.
To start, change, or cancel a subscription contract for your Account, contact the Praxis AI team at humans@praxis-ai.com to request access.
Once a subscription is active, recurring billing is handled by Stripe; for any change, contact the Praxis AI team.

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Receipts and payment methods

Cards are collected at Stripe checkout; Pria keeps no payment method on file. Past purchases and their receipts are listed under Billing (Studio UI: Settings › Billing › Usage › Recent purchases; a Digital Twin’s under Instance Settings → Billing). For an invoice copy or a billing-address change, contact the Praxis AI team at humans@praxis-ai.com.

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Plan tiers

Pria offers two ladders of one-time credit packages, Personal and Volume, both open to any buyer. Pricing improves as the bundle grows.
For the full breakdown — including the Named User Subscription model and caching examples — see Plans & Credits.

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Trial credits

Every new user starts with a free trial allocation so they can evaluate Pria before purchasing.

50 free credits

New accounts start with 50 credits. They pay for the person’s own use — their personal Pria and Digital Twins that do not pool credits — and do not expire.
When the credits run out, users are prompted to add credits before continuing.

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BYOK and billing

When you bring your own provider keys (“Bring Your Own Tokens” / BYOT), Pria sends that provider’s requests with your key, so the provider bills your account for the raw usage. Your conversations are still metered in Pria credits — what changes is the price: BYOK customers buy credits at a discount through our sales team.
BYOK customers purchase credits at a 40% discount on standard pricing through our sales team. Standard setup and support charges are unchanged. See Bring Your Own Model.
A mixed model — your own key for one provider, Praxis-managed access for another — is fully supported: keys are set per provider under Configuration and Integrations → API Keys (and per custom model in AI Models).

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Refunds and exceptional adjustments

Refunds, credit grants for service incidents, and other exceptional adjustments are handled manually so that an audit trail exists for every change.
To request a refund, a goodwill credit, or a balance correction, contact the Praxis AI team at humans@praxis-ai.com to request access.
Routine credit transfers between an Account and its Digital Twins are self-service — see Credit Allocation & Transfers.