You launch an outbound campaign on Friday afternoon. Twenty prospects book meetings over the weekend. Monday morning you check the dashboard and see zero activity since Saturday at 11:14 AM. The balance hit zero. The agent stopped mid-list. Three days of momentum gone because you forgot to add credit before the long weekend.

This happens more than it should. Auto top-up exists to stop it, but most tenants either skip the setup or set the threshold so low that they still run dry during high-volume windows. Here's how the feature actually works and why the defaults matter more than you think.

What auto top-up does

Auto top-up monitors your account balance in real time. When the balance drops below a threshold you set, the system charges your stored card and adds credit immediately. No manual login. No campaign interruption. No missed calls because the platform ran out of funds at 2 AM on a Sunday.

You control two numbers: the trigger threshold and the top-up amount. If your threshold is $50 and your top-up amount is $200, the system will charge $200 the moment your balance dips to $49.99. Your new balance becomes roughly $250. The cycle repeats when you hit $50 again.

The feature lives under Billing in the tenant settings. You tick a box, enter the two amounts, confirm your card details are current, and save. That's the sixty seconds. Once it's on, you can forget it until your usage pattern changes.

Why most tenants undershoot the first time

The most common mistake is setting a $20 threshold with a $50 top-up. The logic seems sensible: small buffer, small charge, keep the card activity modest. In practice this creates two problems.

First, if you run a high-volume outbound campaign to Australian mobiles at $1.32 per minute, fifty dollars buys you roughly 38 minutes of talk time. A single agent working a tight list can burn through that in an afternoon. You hit the threshold again within hours, trigger another charge, and rack up multiple card transactions in a single day. Your bank's fraud detection might flag it. Even if it doesn't, you're creating noise in your accounting software for no reason.

Second, a $20 buffer is too thin for safety. If your card declines for any reason-expired, daily limit reached, temporary hold-you have only $20 of runway before the agent goes silent. At $1.32 per minute outbound, that's fifteen minutes. One missed email about a declined payment and your Friday campaign dies before lunch.

We've seen tenants set thresholds as low as $5. The system allows it, but it's not a good idea. The calls we reviewed last Tuesday showed one tenant triggering seven top-ups in 48 hours because they paired a $10 threshold with a $30 reload. Every time they launched a new batch, they hit the limit within an hour. The campaign worked, but the payment processing overhead was absurd.

What thresholds actually make sense

If you run inbound-only reception at $0.42 per minute, a lower threshold is fine. Inbound volume is lumpy but predictable. A $50 threshold with a $150 top-up will cover a typical small business for a week or more, even during busy periods.

If you run outbound campaigns to Australian mobiles, set the threshold higher. A $100 threshold with a $300 top-up is a safer starting point. That gives you roughly 227 minutes of outbound talk time per reload and a 76-minute buffer before the system has to act. Enough room to survive a card hiccup or a weekend spike without going dark.

For hybrid tenants-inbound reception plus periodic outbound pushes-start at $75 and $250. You can always lower it later if you find you're reloading too infrequently and tying up capital. It's easier to dial down a working config than to explain to a client why their agent stopped taking bookings because you were $12 short on a Sunday night.

Card on file and buffer transparency

Auto top-up only works if your card details are current. The system will not chase you with reminder emails. If the charge fails, you get a single notification and the feature disables itself until you update the payment method and re-enable it manually. By that point your balance might already be zero.

Check your card expiry once a quarter. Set a calendar reminder if you have to. We've had tenants run smooth for eleven months, then wonder why the agent went offline the week their card expired. The system did exactly what it was told: stopped trying after the first decline.

The other thing to remember is that your balance is visible in real time on the dashboard. Auto top-up is a safety net, not an excuse to ignore your burn rate. If you're reloading every day, something's wrong with your threshold settings or your campaign strategy. Check the usage graphs, adjust the numbers, and test again.

Set it now and check it once a quarter

Log into your tenant. Go to Billing. Enable auto top-up. Set the threshold to at least half your typical weekly spend and the top-up amount to double that. Save. Confirm the test charge goes through. Done.

Then set a quarterly reminder to review the config. If your usage has grown, raise both numbers. If you've scaled back, lower them. The config isn't sacred. It's just arithmetic that keeps the agent alive when you're not watching.

Need help picking the right thresholds for your use case? Sign up at app.voxreach.com.au/signup and run a few test campaigns. You'll see your burn rate in real time and can set the numbers based on actual data instead of guesses.