> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trynito.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Funding and billing

> How API usage is paid for, and where to manage it.

API access is prepaid. Add funds in Billing at app.trynito.ai; requests draw down the balance. A subscription's monthly allowance applies to API calls first.

Before a provider call the gateway places a hold sized to the request; on success it settles to actual usage, on failure before output it is released. See [Failed-request billing](/api/api-reference/usage/failed-request-billing).

Plans, funds, invoices, and payment methods are managed in the Browser App: [Billing](/plans/billing). Per-key spend caps: [API keys](/api/api-reference/api-keys).

## Related

* [Get usage](/api/api-reference/usage/get-usage)
* [Plans](/plans)
* [Free usage](/plans/free-usage)

## Read the balance

[`GET /api/v1/billing/balance`](/api/api-reference/usage/get-balance) lets owners and admins read available funds with an admin-enabled API key. Balance reads remain available when inference funding or spend-cap requirements are not met, subject to their own request limits.


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