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

# Proxy Billing

> How Kylon accounts for proxy usage.

Kylon proxy calls are checked and recorded against workspace credits where applicable.

## Preflight checks

Before a proxy request is sent to a provider, Kylon may check:

* Whether the workspace has enough credits
* Whether the request is allowed by a script-level credit policy
* Whether the agent has access to the requested provider capability

If a credit check fails, the proxy returns `402 payment_required`.

## Fixed-cost endpoints

Some endpoints have fixed credit costs. Examples include:

| Endpoint family                | Typical fixed cost behavior                                                    |
| ------------------------------ | ------------------------------------------------------------------------------ |
| Tools execute/proxy            | Fixed low-cost request accounting                                              |
| Google-style search helpers    | Fixed low-cost request accounting                                              |
| Apollo search/enrich endpoints | Fixed per-request accounting                                                   |
| FastMoss endpoints             | Fixed per-request accounting by endpoint                                       |
| Places endpoints               | Fixed per-request accounting                                                   |
| Logo.dev endpoints             | Fixed per-request accounting                                                   |
| ScrapeCreators endpoints       | Provider response may include its own credit estimate, with a default fallback |

## Dynamic-cost endpoints

Some providers are accounted from returned usage:

| Provider family                   | Usage signal                   |
| --------------------------------- | ------------------------------ |
| OpenAI-compatible model routes    | Token and image usage          |
| Anthropic-compatible model routes | Token usage                    |
| Gemini-compatible model routes    | Token and media usage metadata |
| Cerebras-compatible model routes  | Token usage                    |
| OpenRouter model routes           | Token usage                    |
| ElevenLabs-compatible routes      | Character usage                |
| Apify actor runs                  | Actor compute units            |
| Seedance video generation         | Estimated video compute units  |

## Streaming requests

For streaming model requests, Kylon records usage after the stream completes or disconnects. If the client disconnects, the request is stopped and recorded as disconnected.

## Error accounting

Failed provider requests are still recorded with status code, provider, endpoint, model when available, and a short error summary. This helps teams understand which calls are failing and why.