In this guide7 sections
The cost of an AI voice agent is usually built from call minutes, sometimes with a subscription or a setup fee on top. The real total does not come from the advertised rate, though. It comes from three variables of your own: how many calls you have, how long they last, and how each one is rounded. With AgentVocal you pay per minute of conversation, rounded up on each call, plus a one-off setup per channel, with volume discounts, and the only calls not charged are those nobody answers (voicemail is charged).
This guide explains the pricing models you will come across, how to work out billed minutes, and what to ask a provider before you sign. We do not quote market figures and we do not promise savings: the examples below are in minutes, so you can apply them to any offer you receive.
Which pricing models will you find?
Four models come up most often, sometimes combined:
| Model | How it works | Advantage | What to watch |
|---|---|---|---|
| Per minute | You pay for every minute of conversation | Cost follows usage | How minutes are rounded; what counts as a minute (unanswered call, voicemail) |
| Monthly subscription with included minutes | A fixed fee that includes a bundle of minutes | Predictable budget | What happens above the bundle; what you lose if you do not use it all |
| Per call | A fixed price per call, whatever its length | Easy to calculate | Length limits; how very long or unanswered calls are treated |
| Per channel or per agent | A fee for each number, agent or active language | Cost tied to structure | How many “channels” you really have and what is charged on top |
There is no “right” model. Per minute is fair when calls vary in length. Per call is convenient when length is predictable. A subscription suits stable usage. What matters is that you understand exactly what is counted and what is not.
With AgentVocal, the base is a per-minute rate for conversation, plus a one-off setup per channel and per additional language and, optionally, the messages sent after the call.
How do you work out the cost of a call?
The basic formula:
Cost per call = billed length (in minutes) × rate per minute
The provider gives you the rate. The billed length, however, you can work out yourself, and it is not always the real length. With AgentVocal, minutes are rounded up on each call. That changes the maths, especially when many calls are short.
Example: rounding per call
Five confirmation calls with different real lengths:
| Call | Real length | Billed minutes |
|---|---|---|
| 1 | 20 seconds | 1 |
| 2 | 70 seconds | 2 |
| 3 | 95 seconds | 2 |
| 4 | 130 seconds | 3 |
| 5 | 40 seconds | 1 |
| Total | 5 minutes and 55 seconds (about 5.9 minutes) | 9 minutes |
Whatever the rate, you pay for 9 minutes, not 5.9. Rounding alone adds about half again on top of the time actually spoken. So when you compare providers, always ask how rounding works and multiply the rate by billed minutes, not spoken ones.
Example: average length
If your calls last on average just over a minute, each one is billed as 2 minutes. If you can keep them under a minute, each is billed as 1. A short, clear script that states its purpose in the first sentence shows up directly in your billed minutes.
Example: monthly volume
Suppose 3,000 calls a month at an average of 2 billed minutes each, so 6,000 minutes a month. That is the number you multiply by the rate in the offer you receive. On top come the setup (once) and after-call messages, if you use them.
The number of calls, the average length and the rounding rule are the three variables you control. If you do not have these figures yet, get them from a test period, not from guesses. How to track them over time is covered in how to measure an AI voice agent.
How is the cost built at AgentVocal?
The billing rules are fixed and known in advance:
| Item | How it is charged |
|---|---|
| Conversation minutes | Per minute, rounded up on each call |
| Volume discounts | Automatic: the per-minute rate drops as monthly volume grows |
| Setup | Once, per channel |
| Additional language | Once, per language |
| After-call messages (SMS, WhatsApp, email) | Per message sent, only if you switch the channel on; for WhatsApp, plus your own subscription with your WhatsApp provider |
| Minimum package | There is a minimum monthly package of minutes (a monthly commitment), shown in your estimate |
| Call nobody answers | Not charged |
| Voicemail | Charged as a normal minute |
The volume discount applies to your whole monthly usage, not only to the minutes above the threshold. Prices are shown without VAT, which is added on the invoice. The current rates are on the pricing page.
How to find the figure for your business
You fill in the sign-up form: choose your scenarios, languages and channels, and enter your estimated volume. The estimated cost appears instantly, before you submit anything, and includes the minimum package if your volume is below it. Submitting the request does not automatically create an account or a contract, and a member of the team reviews your request within 24 hours.
Which hidden costs should you check with any provider?
The per-minute price is only part of the invoice. Check these separately:
- Setup and training: charged once, monthly, or not at all? Does it include testing and adjustments?
- Languages: does each extra language cost separately? Is the quality the same in all of them?
- After-call messages: are SMS, WhatsApp and email included or charged? WhatsApp usually also involves your own subscription with the messaging provider.
- Integrations: is connecting to your CRM or ERP included? Does it need an API on your side?
- Monthly minimum: what happens if you do not reach it? Does it roll over, expire, or get invoiced?
- Rounding: per call or per second? Up to the whole minute?
- Unanswered calls and voicemail: charged or not? How they are treated can change the bill a lot on lists with a low answer rate.
- Calls to other countries: how are calls to other EU countries or other destinations priced?
- Recordings, transcripts, storage: included? For how long? Can you export them?
- Phone number: is it included, and what happens to it when the contract ends?
- Notice and termination: how do you leave the contract, and with what minimum commitments?
- VAT: are prices shown with or without VAT?
What should you ask a provider before you sign?
Ask these questions in writing and keep the answers:
- “What is the rate per minute, and how is the length of each call rounded?”
- “What counts towards billed minutes: unanswered calls, voicemail, time on hold?”
- “Which fees are one-off and which are monthly?”
- “What happens if I do not reach the monthly minimum?”
- “How does the price change when volume goes up or down?”
- “What is not included in the price?”
- “Can I test on my own scenario, with real figures, before I commit?”
- “Where can I see the cost of each call, in real time?”
- “How is data handled: who is the controller, who is the processor?” See the security page.
A serious provider answers all of these without dodging. If the answers are vague, treat that as information about what the invoice will look like.
How do you compare two offers fairly?
Comparing on “price per minute” is misleading. Use a simple method:
- Pick one concrete scenario (for example, order confirmation) and the same assumptions for both offers: number of calls, average length, how many calls go unanswered.
- Apply each provider’s rounding rules to the same calls.
- Add everything outside the minute: setup, languages, messages, integrations, minimums.
- Work out the cost per resolved call, not per minute: a longer call that settles everything can be better than two short ones that settle nothing.
- Compare with the human option too, with everything it involves: salaries, time taken from other tasks, limited hours. More in AI voice agent or call center.
- Test before you commit: a test on real data shows your real average length, and the whole calculation depends on it.
Watch out for two traps: comparing a “from” rate (usually valid only at high volumes) with one for your real volume, and ignoring the cost of an agent that does not resolve the call and forces you to repeat it.
The practical takeaway
The cost of an AI voice agent comes from four things: the number of calls, their billed length, the per-minute rate and the costs around the minute. Do the maths on your own scenario, with real figures from a test, and ask every provider for the same data. With AgentVocal, you see the estimated cost in the form before you submit anything. If you would rather first understand what the agent does, start with what an AI voice agent is.