> ## Documentation Index
> Fetch the complete documentation index at: https://research.verifyyou.com/llms.txt
> Use this file to discover all available pages before exploring further.
# How it works
> How the one-time password gate works, and why it holds up.
2 of 5Next: Alchemer setup
One idea holds the whole thing up: **every password is tied to one unique human and works exactly once.**
## Why the gate holds
Each password is a claim ticket. We only hand one to a person who just proved, on camera, that they are **live** and **unique**. Your study enforces the ticket with Alchemer's own Login/Password action, set to individual one-time passwords that deactivate after use. Alchemer's feature, Alchemer's wording.
So every cheap trick fails: a shared link carries a spent password, a guessed password does not exist, a bot never earns one, and the same face can never get a second one for the same study, on any device.
One honest limit: the check proves who they are, not how carefully they answer. Keep your speeder and attention checks.
## What it costs
About one to two cents a verification, charged once per human, so returning respondents never count again. On a \$10,000 sample of \$3 to \$7 completes, the whole check is a rounding error. Compare that to what a single bad complete costs you: the incentive, the sample fee, and the analyst time spent wondering whether to trust the row.
## What we never touch
No photo is shared with you or with Alchemer, only a yes or no. Your study receives a verdict and a password, never a face, a name, or personal information.
## Start here