Is there a monthly spending cap?

Yes: usage charges are capped at $5,000 for each 30-day billing period, and the period starts when you accept billing, so track it from acceptance rather than the calendar month. The cap is part of the Shopify usage billing subscription, billed in USD, which is what makes the upper limit predictable even when conversation volume spikes.

What happens if you hit it

Simple Chat can continue resolving conversations. Additional AI-resolved closes in that billing period are simply not charged, so service can continue for customers while usage charges for the period stop growing.

Most stores will run far below $5,000; the cap is mainly a safety limit for unusually high volume. Use it for worst-case budgeting, not as a forecast of what you'll spend each period.

What counts toward the cap

Only AI resolutions add to paid usage, at $0.29 per AI resolution. A segment qualifies when it has at least one customer-visible AI reply, no customer-visible staff reply since the conversation opened or was last reopened, and an AI close. Internal notes, staff-only investigation, and background tool usage don't make a segment staff-resolved by themselves; a customer-visible staff message does. Conversations that don't qualify add nothing to paid usage, which also slows how fast you approach the cap.