How much to charge for an AI agent: build the price from your cost, not from the market

An AI agent is not one product, it is two. One is delivered once, the other is provided every month. Putting them on the same line of the proposal is where half of the projects that end in losses begin: you charge a $300 monthly rate thinking it covers everything, and you have just given away fifteen hours in month one.

Setup is your work, measured in hours. Not "onboarding" or "advanced configuration": hours somebody on your team will log, with an internal cost attached. Here is a realistic breakdown for a WhatsApp agent covering a single line of business, the booking or appointment kind, with no unusual integrations.

1. 01Account setup and business verification: 1 to 2 hoursAccount, phone number, business verification with Meta. Your own time is short; the waiting time is not yours to control, and it is worth telling the client that in writing.
2. 02Conversation flow design: 2 to 3 hoursWhat the agent resolves, where it hands off to a human, what it does after hours. This is the part that decides whether the project works, and it is the first thing cut when you sold too cheap.
3. 03Writing and submitting templates: 2 to 3 hoursEvery template is reviewed when you create it and again when you edit it, and that review can take up to 24 hours according to Meta's documentation. Plan for it before you promise a launch date.
4. 04Connecting to what the client already uses: 2 to 4 hoursCalendar, CRM, spreadsheet, booking tool. This is where the range blows up if you did not look at the system before signing.
5. 05Testing with real conversations: 2 to 3 hoursWith the client typing from their own phone, not a lab script. Something always breaks.
6. 06Training and handoff: 1 to 2 hoursOne session with whoever will live with the agent, plus a one-page document. Skip it and month two fills up with support you cannot bill.

Eleven to seventeen hours for a normal case. Apply your internal hourly cost and you have the floor for your setup fee. What you cannot do is fold those hours into the monthly rate and hope to recover them: if the client leaves in month four, you paid for them.

The monthly retainer is a different animal: platform access, agent maintenance, and message consumption. Three line items with three different behaviors, and only one of them is fixed.

The fixed cost is the easy part, because it arrives on an invoice. With SignalCore it is €79/month on Starter and €297/month on Growth, which is the plan that includes white-label; paid annually they drop to €58/month and €166/month. Enterprise is custom, and the first agent is free with no card, which is exactly what you need to build the first one and measure real hours before pricing anything. What each plan includes is on the pricing page.

The number that matters is not the plan price, it is the plan price divided by your active clients. That is what enters the per-client calculation, and it falls fast: it is the only part of your structure that improves on its own as you grow.

On top of that, add what is not on that invoice and is still fixed: the maintenance hours you reserve for that client every month (tuning replies, reviewing templates, handling a schedule change), plus any number and verification charges from your telephony provider or carrier. That block is yours and you control it.

A warning about maintenance hours: if your proposal says "support included" with no number of hours next to it, you are not selling support, you are selling an open bar. Write the number down.

Here is a real agency client, with every assumption stated so you can swap in your own. None of these numbers is a market average or anyone's reported data: they are the parameters of one case, and the point is the structure, not the figures.

Assumptions: agency on the annual Growth plan (€166/month, white-label included) with 10 active clients. Internal hourly cost of $120. Setup of 11 hours. A reserve of 1.5 maintenance hours per month. A client sending roughly 900 marketing templates a month (promotional notices to their list) and roughly 1,200 utility templates inside the window (confirmations and reminders), plus whatever free-form traffic the conversation generates.

We call the cost per message p, with a subscript for the category: p_mk for marketing and p_ut for utility. We do not publish amounts, because the rates live in the per-currency rate sheets in your account, change up to four times a year, and depend on the recipient's country code. You can pull yours from your own rate sheet in five minutes.

One note on currency before the table: the SignalCore line is billed in euros, so it stays in euros. Everything else is in dollars. The euro line is small and it shrinks as you add clients, so it does not change the shape of the calculation, but subtract whatever your bank converts it into before you call the margin final.

1. 01A. Allocated platform = your plan price / active clientsRecalculate every quarter. It falls on its own as you grow, and it is what lets you lower prices without losing margin.
2. 02B. Maintenance = hours reserved per month x your hourly costIf you do not have a committed number of hours in writing with the client, you cannot fill this field in and the whole calculation is worthless.
3. 03C. Monthly fixed = A + BThis is what that client costs you even if they never send a single message.
4. 04D. Monthly variable = (marketing templates x p_mk) + (utility templates x p_ut) + (authentication x p_auth)Pull the rates from your own rate sheet for the recipient's country code. From October 1, 2026, add a line for service messages.
5. 05E. Total monthly cost = C + DCompare it with the fee you signed. If the difference is smaller than your allocated cost of acquiring that client, they are not paying you for the work.
6. 06F. Message ceiling at zero margin = (fee - C) / p_mkThis is the number past which you start paying to serve them. Write it on the client record and set an alert at 70 percent.

With a $650 retainer, your entire monthly margin lives inside $470 that gets eaten message by message. If your p_mk were 5 cents, those 900 messages would cost you $45 and leave $425. If it were 15 cents, $135, leaving $335. Same client, same fee, and the only variable that changed is the recipient's country code.

And on October 1, 2026 two line items that are worth zero in this table today switch on: the 1,200 utility templates inside the window and all the free-form traffic you do not even count right now. Come back to this table that day with the published rates and redo the variable line before you renew any annual contracts.

Here is the clean template to copy and fill in with your own numbers.

The breakeven formula is line F above: fee minus fixed cost, divided by the unit cost of the message type you send most. This table shows the slope using the $650 fee and the $180 fixed cost from the example, ignoring the euro platform line, which lowers each ceiling slightly. The p values are arithmetic so you can see the shape of the curve, not Meta rates.

Look at what happens between the first row and the last: the client does not change, the work does not change, the fee does not change. One cent changes, and the ceiling divides by more than twelve.

Three concrete decisions come out of this. First: a pure flat rate is only defensible when the client's volume is capped by their own business, not by their willingness. A clinic with 300 patients is not going to send you 10,000 marketing messages no matter how much they want to. An ecommerce store running campaigns will.

Second: the danger is not the client who sends a lot from day one, because you priced that one correctly. It is the one who grows. They start at 400 messages, it works, and eight months later they are at 3,000 on the fee they signed. Without an annual review and a written threshold in the contract, you pay for that growth.

Third: the recipient's country code is part of the contract's scope. A U.S. client who starts running campaigns to a list in Mexico or Brazil is not using more, they are using something else, at a different rate. Put it in the contract.

A short list of things that, folded into the monthly rate, eat your margin without showing up in any report until it is too late.

• Bulk marketing campaignsBlasting a list is pure variable cost in the one category that is always billed. It goes out as a separate service, with its own quote and its message cost passed through.
• Support for the client's staffTraining the new person who joins the front desk in March is not agent maintenance. It is training, and it gets billed.
• New integrationsEvery system you connect after launch is a small project. Its own quote.
• Rebuilding templates after a recategorizationIf Meta changes a template's category or rejects it because it should have been authentication, there is work to do and it is not your fault. Cover it in the contract as additional work, or at minimum with a bank of annual hours.
• The client's own compliancePrior opt-in before messaging on WhatsApp is required and it is the responsibility of whoever sends the messages. You can build the mechanism, but you cannot guarantee their list is clean or absorb that responsibility inside a $300 fee. And note: Meta accepting a general opt-in does not mean the consent rules that apply to your client are satisfied by the same thing, whether those are U.S. federal and state rules on commercial messaging or the GDPR, where it applies to you or your end users. On disclosure obligations, we cover that separately in the article on when you have to tell people they are talking to an AI.

A pricing article without this section is a brochure. These are the profiles where the math almost never works, and it is better to know before signing than in month five.

• High volume, low ticketThe client who wants to send thousands of marketing messages a month on the cheapest retainer. Their variable cost swallows your entire fixed margin. Either the fee goes up, or pricing goes by consumption, or they are not your client.
• A contact list with no consent trailIf they cannot show how the opt-in was obtained, the project carries a risk that does not fit inside your margin. Ask for the mechanism, in writing, before you build anything.
• A single point of contact who cannot decideIf the person hiring you has to ask permission for every copy change, your 1.5 maintenance hours turn into five. You see it immediately during testing.
• An expectation of replacing a person in month oneIf what the client is buying is laying somebody off in 30 days, the project is born with a yardstick you cannot meet and an infinite support tail ahead of it.
• An industry whose integrations you do not knowFour hours of connection work turn into twelve, and you sold them as a fixed fee. If the industry matters strategically, charge it as a time-and-materials pilot and learn with a net.