Top up your SMS and voice-call balance
SMS and voice call alerts are billed per message, drawn from a prepaid credit balance on your account. Email, Telegram, Slack, webhook and most other channels don’t consume this balance.
Check your balance
Section titled “Check your balance”Open Billing → Balances to see your current SMS/voice credit and recent charges.
Top up
Section titled “Top up”- Open Billing → Balances.
- Click Add funds.
- Choose an amount and complete payment (see Payments & invoices for the payment methods HostTracker accepts).
Your new balance is available immediately after payment confirms.
Low-balance alerts
Section titled “Low-balance alerts”HostTracker warns you by email before your balance runs out, so an SMS or voice alert never silently fails to send because of an empty balance. If your balance reaches zero, SMS and voice sends stop until you top up again - your monitors keep checking and other alert channels keep working normally.
See SMS billing for how message cost is calculated (message segments, destination, channel).
Limits and gotchas
Section titled “Limits and gotchas”- SMS balance is an app-only feature today - there is no public REST API or MCP endpoint to read your balance or top it up; check it from Billing -> Balances.
- Some plans include a starting free SMS credit and their own low-balance threshold - both are set by your plan, not something you configure yourself.
- Balance running out never pauses your monitors - only SMS/voice sending stops until you top up.