Free Retell & VAPI billing audit
How much money is your voice agent wasting?
Paste your Retell or VAPI key below and find out in under a minute. We break down three months of calls by product, month, week and day, and price every avoidable cost to the year. Your key never leaves your browser.
You will see more about where your money goes than your own platform console shows you.
Retell keys start key_ and live under API Keys in the Retell dashboard. VAPI private keys are the UUID under API Keys in the VAPI dashboard. We work out which is which from the key itself. Only aggregate call data is reported — no transcripts or recordings are accessed in any way. You can revoke the key in your dashboard the moment the scan finishes. Please only paste a key you are authorised to use.
Getting call history
Your API key never leaves this browser
- The audit runs as JavaScript on your own machine. Your key goes only to your platform's own API, the same place your own code sends it.
- We never receive it, never store it and never log it. It lives in memory and dies with the tab.
- Nothing is written to local storage or cookies. No analytics, no fonts, no scripts, nothing loaded from anywhere.
- The moment the scan starts, the key field is removed from the page entirely. Open your network tab and check us. That is rather the point.
What you get — a sample report, with illustrative numbers:
The money leak
$2,473
a year in avoidable charges we can take off this bill.
The biggest single leak: 2,254 of 2,885 calls carried a prompt over Retell's 4,000 token threshold and were surcharged for it. That is 42.1% of the bill, spent on nothing.
Plus the full evidence: daily spend by product, month/week/day breakdowns, engine mix, and a per-finding fix list — all from your own billing records.
What we would do about it
Every figure below is computed from your own billing records over the audited window and projected to a year, with no benchmarks or averages from other people's accounts. Where we price a swap, we use the vendor's published rates as of .
The evidence
Where the money goes, hour by hour
Every call in the window, bucketed by the hour of day it started.
Daily spend by product
Every product you were billed for, stacked per day across the whole window. Anything avoidable is in red. Scroll sideways to see it all.
Spend over time
Where the money goes
Agent engine mix
Want a closer look?
This audit reads your bill. If you want the rest of the picture — what your agents and conversation flows actually do, where the cost really comes from, and the kind of visualizations and drill-downs you cannot get from a platform console — that is what we do all day.
Talk to Testzilla or see testzilla.ai