> For the complete documentation index, see [llms.txt](https://docs.tryflox.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryflox.xyz/using-flox/credits.md).

# Buying credits

Fresh assessments are metered through the `FloxCredits` contract. You deposit ETH, spend credits per assessment, and withdraw anything unspent at any time.

## How it works

Credits are per-address and asset-agnostic — one balance covers assessments on any token in the watchlist.

Authentication is a signature, not a bearer token. When you run an assessment, your wallet signs a short message containing a nonce. The server recovers your address from the signature and reads that address's on-chain balance. There are no accounts, no passwords, and no user database.

## Depositing

From the console: connect your wallet, open **Add credits**, choose an amount, and confirm. At the default price of 0.00001 ETH per query, roughly 0.001 ETH buys 100 assessments.

Under the hood this is a plain ETH transfer to the `FloxCredits` contract, which credits the sender automatically.

## Withdrawing

Unspent credits are withdrawable at any time. There is no lockup and no admin freeze. The operator can only ever withdraw revenue it has already settled — never your unspent balance.

## Verifiable billing

Every settlement carries the log head it covers. That means you can confirm you were charged for assessments that actually exist in the public record, rather than taking the operator's word for it.


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