Dissolve Labs

The Contract Trap

Flat annual voice AI contracts are priced for the vendor’s revenue predictability, not your seasonal call volume, so you overpay in slow months and get overage fees in busy ones.

4 min read
A flat dashed contract line torn open to reveal a sharply changing usage line.

In March, Priya signed a 12-month voice AI contract for her three-clinic booking line. The demo nailed every accent, and the annual plan came with a "loyalty discount" for committing now. She signed. Felt good about it, even.

By July, her slowest month, she was paying the same invoice as her busiest March. By November, flu season tripled her call volume, she blew through her included minutes, and got hit with overage fees on top of the contract she was already locked into. She paid the most in her slowest month and her busiest month, and the least in the one month usage actually matched the plan.

That's the contract trap. It isn't a scam, it's just a pricing shape built for someone else's business, not yours. Vendors love annual commitments because predictable revenue is easier to forecast than yours, and your call volume, if you're small or growing, is never a flat line. It moves with seasons, campaigns, and plain bad luck, and vendors aren't exactly incentivized to bring that up during the sales call.

A flat contract against a business that isn't flat

Illustrative scenario, not a specific vendor's pricing. Scrub the slider for that month's numbers

Line chart, 12 months. Flat contract holds steady at $3,000/month. Usage-based cost swings from about $1,200 in the slowest month to about $4,800 in the busiest, crossing the flat line twice.$0k$1k$2k$3k$4k$5kFlat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Flat contract: $3,000Jan, usage-based: $2,200; flat: $3,000Feb, usage-based: $1,800; flat: $3,000Mar, usage-based: $3,200; flat: $3,000Apr, usage-based: $2,600; flat: $3,000May, usage-based: $2,000; flat: $3,000Jun, usage-based: $1,600; flat: $3,000Jul, usage-based: $1,200; flat: $3,000Aug, usage-based: $1,900; flat: $3,000Sep, usage-based: $2,400; flat: $3,000Oct, usage-based: $3,400; flat: $3,000Nov, usage-based: $4,800; flat: $3,000Dec, usage-based: $3,900; flat: $3,000JanMarMayJulSepNov
Flat committed contract (example)Usage-based cost (example)

Flat contract: $3,000

The uncomfortable part is that the fix isn't really a checklist you run once before signing. Contract language is written by people whose job is to make a committed-volume plan sound like flexibility, and a single call with a sales rep isn't a fair fight against that. Usage-based pricing isn't automatically the right answer either: it makes your invoice harder to forecast than a flat number, and if your volume actually is flat year-round, a committed contract can be the better deal. Flat contracts are still the right call for genuinely flat, predictable volume, the trap is buying one without checking your own seasonality first. The point isn't "always push for usage-based." It's that almost nobody outside a vendor's own sales org knows which pricing shape actually fits a given business until someone models it against real call volume, not a sales deck.

At Dissolve Labs, we build custom voice AI agents around how your business actually runs, and part of that is not letting you walk into a pricing shape built for someone else's forecast. If you're evaluating voice AI and want your actual call pattern (not a sales rep's assumption about it) driving the pricing conversation, we'd be glad to sit in on that call with you.