senderZ iMessage API pricing

$39 to $599/mo billed annually, metered on unique new contacts rather than messages.

PublishedCompiled August 24, 2026Full review

The tiers

Entry
$39per month, billed annually
- iMessage-first routing with SMS fallback
- A capped number of unique new contacts per month
- Unlimited messages to contacts already reached
- Built-in TCPA, CTIA, opt-out and quiet-hours handling
- MCP integration for AI agents
Catch The headline price is annual billing. The cap that matters is new contacts, not messages.
Upper tiers
up to $599per month, billed annually
- Higher monthly first-contact allowances
- Sub-accounts with isolated phone pools
- Multi-tenant support for agencies

Costs that are not on the pricing page

Monthly billing costs more than the advertised annual rate.
Broad prospecting burns the meter fast — the model is built for repeat contact, not first contact at volume.

senderZ is the only vendor in this category that does not meter messages or lines. It meters unique new contacts — the first time you message someone counts, and everything after that is free.

Whether that is cheap or expensive is not a property of the price list, it is a property of your list. Two businesses on the same plan can see costs an order of magnitude apart.

Cheap on this model

A fixed book of 500 clients messaged all year
Support and service threads with long lifespans
Account management and renewals
Anything where reply volume dwarfs first-touch volume

Expensive on this model

Cold outbound to a fresh list every month
One-and-done transactional notifications to new buyers
Lead-gen where most contacts never reply
High churn, low repeat contact

Model it before you commit

Count the unique people you messaged for the first time last month. That number, not your total send volume, is what you are buying. If it is small and your total volume is large, this is the cheapest vendor in the category for you.

Where these numbers come from

Taken from senderZ's published pricing page in August 2026. The first-contact metering model is stated by the vendor; the practical cost depends entirely on your own list behaviour.

Best value for

Teams with a defined prospect list they work repeatedly, where the same contacts receive many messages over time.