> ## Documentation Index
> Fetch the complete documentation index at: https://docs.serializedaudit.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Credits & Billing
> What a call costs and how billing works.
Each plan includes a monthly allowance of **credits**. Every audit draws from it. Re-checking a contract you've already audited is the cheapest path.
## What a call costs
| Call | Credits |
| ----------------------------------------------------------- | ------- |
| Re-check a contract you've already audited | 1 |
| New audit, verified source | 4 |
| New audit, closed source | 16 |
| Subscribe a token to push updates (one-time, per new token) | 2 |
A new audit costs **4 credits** for a contract with verified, published source. Unverified (closed-source) contracts cost **16 credits**, since they require more work to analyze.
Subscribing a token to [push updates](/sse-and-webhooks) is a **one-time 2 credits** per token, charged only for genuinely new subscriptions (re-subscribing an existing token is free), and any re-audit the watcher later triggers is included at no extra cost. A bulk subscribe of *N* new tokens therefore costs *N* × 2.
Credits are billed per account, not per key; all of your keys share one allowance.
## Plans and overage
Choose a monthly plan that fits your volume on the [pricing page](https://www.serializedaudit.io/portal/plans). Credits reset each billing period. With pay-as-you-go enabled, calls beyond your allowance are billed automatically; otherwise the API returns `402` once the allowance is reached (see [Errors](/errors)).
New accounts start with **free trial credits** so you can integrate before subscribing.
## Tracking usage
Your [dashboard](https://www.serializedaudit.io/portal) shows credits used and remaining for the current period, usage over time, and recent calls.
Enterprise plans offer custom volume and terms. Talk to us.