The number on the pricing page is a starting point. Here is what tends to appear afterwards, and the exact question that finds each one before you commit.
Overage past the bundle
The most common surprise. A plan includes an allowance, and the rate past it is frequently much higher than the effective rate inside it.
Ask: "What is the per-unit rate once I exceed the bundle, and does it step up in tiers?"
What counts as a billable unit
"1,000 messages" can mean a thousand visitor messages, a thousand bot replies, or a thousand of both combined. The difference can halve your effective allowance.
Ask: "Does a message mean the visitor's message, the reply, or both?"
Training and re-ingestion
Some products charge to process documents or re-crawl a site. Since your website changes, this can be recurring rather than one-off.
Ask: "Does re-training after a website change cost anything?"
Seats stacked on usage
Products built around a shared inbox often charge per agent and for AI usage. Two meters running at once.
Ask: "Is there a per-seat charge in addition to AI usage?"
Additional bots or sites
If you run several sites, or an agency runs many, the per-bot cost matters more than the headline plan.
Ask: "What does an additional bot or website cost?"
Branding removal
Removing "powered by" is one of the most common paid upgrades. If your brand matters, price the tier that includes it rather than the one you first looked at.
Integrations behind a higher tier
CRM, calendar and webhook access are frequently gated above the tier you were quoted.
Ask: "Which tier includes the integrations I listed?"
The one-page test
Put your requirements in writing and ask for a total for your peak month with everything included. A vendor confident in their pricing will give you a number. Anyone who cannot is telling you something.
Our own position
SpideyChat publishes flat tiers with the allowance stated, and the feature gates are on the pricing page rather than discovered later. That is not generosity, it is that unpredictable bills produce churn, and churn is more expensive than the revenue metering would have captured.
Related: pricing models explained · see our pricing.