AI Answering Service Cost per Month: What to Budget in 2026
AI answering services are priced in four ways: flat monthly, per minute, per call, or a hybrid of a base fee plus usage. Trexinet charges $59 per month plus $0.05 per minute with no contract. Human services such as Smith.ai and Ruby list plans from $250 to $2,100 per month, so budget by model and call volume.
The four pricing models, explained
Every answering service, human or AI, bills in one of four ways. The model matters more than the headline price, because it decides what happens in a busy month.
- Flat monthly. One fee, a set number of calls or minutes included, and an overage rate above that. Predictable until you cross the line, then expensive.
- Per minute. You pay for talk time. Common with human receptionist services. Long calls and chatty callers cost more, short calls cost less.
- Per call. You pay each time the phone is answered, regardless of length. Common with human services that bundle calls into tiers. Wrong numbers and spam may count.
- Hybrid. A low base fee plus usage, usually per minute. This is how most AI services price, because the base covers the setup and the software while usage tracks actual work.
What each model costs: the prices vendors publish
Below are figures taken from the providers' own pricing pages. Smith.ai and Ruby are human receptionist services and are included because they are the benchmark most owners compare against. Trexinet is an AI voice agent. Check each page before you buy, since plans change.
| Provider and plan | Pricing model | Listed monthly price | Included usage |
|---|---|---|---|
| Smith.ai Starter | Per call, human receptionists | $300 | 30 calls |
| Smith.ai Pro | Per call, human receptionists | $2,100 | 300 calls |
| Ruby 50 minutes | Per minute, human receptionists | $250 | 50 minutes |
| Ruby 500 minutes | Per minute, human receptionists | $1,725 | 500 minutes |
| Trexinet | Hybrid, AI voice agent | $59 base | $0.05 per minute, no contract |
What those numbers mean per call and per minute
Smith.ai's tiers work out to about $10 per call across the range, as listed on their pricing page, with a Basic plan at $810 for 90 calls sitting between the two shown above. Ruby's entry plan works out to about $5 per minute, with 100 minutes at $395 and 200 minutes at $720 between the two rows in the table.
Trexinet has no call tiers. The $59 base covers the managed setup, the software, and the 24/7 line. Every minute the agent spends on a call is billed at $0.05. A quiet month costs close to the base. A busy month costs the base plus the minutes, with no plan to upgrade and no overage rate.
The human services are not overpriced for what they are. A person answering your phone costs what a person costs. The question is whether your calls need a person, and our human vs AI comparison goes into that. This post is only about the bill.
How to estimate your own monthly bill
You need two numbers from your phone log: calls per month and average minutes per call. Most carriers and phone systems show both. Take a normal month, not your slowest or busiest.
Then apply the model. For a per-call plan, find the tier that covers your monthly calls and note the overage rate for the months you exceed it. For a per-minute plan, multiply calls by average minutes and find the tier that covers it. For a hybrid plan like Trexinet, the bill is 59 + 0.05 × total minutes.
Do the estimate for your busiest month as well. Seasonal trades such as HVAC and pest control can see their call count jump for a few weeks. On a tiered plan that pushes you into overage or a higher tier. On a per-minute hybrid, the bill rises in proportion to the extra minutes and then falls back.
Hidden fees to ask about before you sign
The listed price is rarely the whole bill. Ask every provider these questions in writing and keep the answers.
- Overage rate. What does a call or a minute cost above the included amount, and is it billed at a higher rate than the plan's average?
- Setup or onboarding fee. Is there a one-time charge, and what does it cover?
- Minimum term. Is there a contract, and what does it cost to leave early?
- Rounding. Are minutes billed by the second, or rounded up to the next minute or the next thirty seconds?
- Spam and wrong numbers. If the service answers a robocall, do you pay for it?
- Transfers. Does a call that gets transferred to you bill as one call, or does the transfer add minutes?
- Integrations. Does connecting your calendar or field software cost extra per month?
- Price changes. Can the provider raise the rate mid-term, and with how much notice?
Which pricing model fits which business
Per-call plans suit businesses with long, involved calls, since a twenty-minute conversation costs the same as a two-minute one. Per-minute plans suit businesses with many short calls. Flat plans suit businesses whose call count barely moves from month to month. Hybrid plans with a low base suit businesses that cannot predict volume, which describes most trades.
The wrong fit shows up in the busy season. A pest control company on a 30-call tier in April, or a plumber on a 50-minute plan during a cold snap, will either hit overage or miss calls. Pick the model for your worst month, not your average one. Our answering service vs call center guide covers the volume question in more depth.
What Trexinet costs and what the base fee buys
$59 per month plus $0.05 per minute, no contract. The base includes fully managed setup on your real calls, tuning after launch, 24/7 answering, booking on your calendar, and a text summary after every call. Minutes are the only variable. If a month is quiet, the bill is close to the base. If you stop, there is nothing to cancel out of. The pricing page lists everything in one place.
Related reading
- AI answering service cost, the full breakdown
- AI vs human receptionist
- AI answering service vs call center
Frequently asked questions
Is there a free AI answering service?
Some tools offer a free tier with a small number of minutes or a trial period. The catch is usually self-serve setup, which means the quality depends entirely on what you configure. For a business phone line, the cost of a badly handled call is higher than the software fee, so weigh a free tier against a managed one carefully.
Why are human answering services so much more expensive?
Because a person is on the line. Human services pay receptionists, train them, staff for peaks, and cover nights and weekends. Smith.ai and Ruby list plans from $250 to $2,100 per month for that reason. If your callers need a human, that price is fair. If they need a fast answer and a booking, an AI agent costs a fraction of it.
How many minutes will my business use per month?
Take calls per month from your phone log and multiply by your average call length. Add the calls you currently miss, since the agent will answer those too. For a hybrid plan, that total times the per-minute rate, plus the base fee, is your estimate. Do the same for your busiest month.
Do I pay for spam calls and wrong numbers?
It depends on the provider, and you should ask. On per-call tiers a robocall that gets answered may count against your allowance. On per-minute plans it costs the seconds it takes the agent to end the call. Ask how the service detects and ends spam calls, and whether those seconds are billed.
Can I switch pricing models later?
On tiered plans you can usually move up or down a tier at the next billing date, sometimes with a minimum term attached. On a no-contract hybrid plan there is nothing to switch, since the bill already follows your usage. Ask what notice is required to change or cancel before you sign anything.