The three things you pay for
Almost every AI calling tool prices on some mix of three things: a per-minute usage rate for the time the agent is on a call, a monthly platform or subscription fee, and a set of add-ons that quietly stack on top of the headline rate. The headline number a vendor markets is usually the first one, in isolation. The number that actually hits your card is all three combined.
The all-in cost trap
A low base rate is not the real cost. Most platforms quote the voice-engine minute and leave out the LLM tokens, the text-to-speech, and the telephony, all of which you pay for separately. Stack them up and GoHighLevel's native Voice AI lands around $0.16 per minute all-in, Retell runs $0.13 to $0.31, and Synthflow $0.11 to $0.24. The single most useful question you can ask any vendor is: what is the all-in per-minute cost, not the base?
What Junior SDR costs
Junior SDR is $0.05 per minute on US calls and $0.10 per minute rest of world, plus a flat $29/mo per GoHighLevel sub-account, all billed natively through the GHL wallet. Every install comes with 60 free demo minutes. There is no per-seat pricing and no per-concurrency fee, so the number does not creep as you scale up volume or add clients.
How the pricing compares
- Junior SDR: $0.05/min US ($0.10 rest of world), $29/mo per sub-account, native GHL billing.
- GHL native Voice AI: around $0.16/min all-in, or a $97/mo AI Employee add-on for fair-use use.
- Leadlock: $0.12/min all-in, native to GHL, no monthly or seat fee.
- Synthflow: $0.09/min engine, $0.11 to $0.24/min all-in, outside GHL, pay-as-you-go.
- Retell: $0.07/min base, $0.13 to $0.31/min all-in, plus $8/mo per concurrent call over 20, developer platform.
Rates as of July 2026, compiled from each vendor's public pricing pages. All-in figures are estimates that vary with usage, model, and telephony.
The fees that quietly add up
- Per-seat or per-user pricing that scales with your team instead of your usage.
- Per-concurrency call fees that kick in exactly when volume starts paying off.
- Monthly platform minimums you pay whether you dial or not.
- Subscription lock-in when you resell a tool that bills you a flat fee, so a quiet month still costs you full price.
How agencies actually make money on it
The point is not the lowest rate, it is the spread. At a $0.05/min base, agencies resell at $0.15 to $0.30 per minute, keeping $0.10 to $0.25 of margin, roughly 3 to 6 times markup. Because Junior SDR bills through the GHL wallet, you set that markup once on the reselling page and the margin is collected from client wallets automatically, with no invoices to chase. A tool that bills you outside GHL forces you to reconcile that spread by hand.
What to ask before you commit
- What is the all-in per-minute cost, not the base rate?
- Is there a per-seat or per-concurrency fee as I scale?
- Does it bill natively through the GHL wallet so I can resell cleanly?
- Are there free minutes so a client can hear it before paying?
- What are the international rates, and which countries need extra setup?
Junior SDR is the outbound engine this guide describes, native to GoHighLevel: list-based dialing, number pools, timezone-aware windows, human voice, and live transfer with context.