WhatsApp API cost calculator.
Plug in your real numbers. See what your WhatsApp bill would actually look like on Mossmoon’s flat-per-line pricing versus a Business API path billed per message, by country and message type, at Meta’s rates effective October 1, 2026. No marketing fluff, just the math.
Meta list rates effective October 1, 2026, in USD. Meta does not charge for messages your customers send you.
How we compute each side.
Flat per line, all in.
lines × $15 (or × $20 with voice calling). Unlimited inbound and outbound. No per-message, per-country, or per-seat fees. First line is free for 7 days.
Per message plus platform fee.
(billable messages × Meta rate) + (lines × platform fee). Billable messages are the messages you send; for replies, the first 1,000 per line each month are subtracted. Meta’s rate varies by country and message type (list rates effective October 1, 2026). The platform fee defaults to $25/line/mo, a conservative representative number for BSPs like Twilio, 360dialog, WATI, or Charles; set it to $0 for Meta’s Cloud API direct. Your real BSP bill often includes more (agent seats, integrations tiers, support tiers).
- This is an estimate. Real bills depend on your exact traffic split (replies vs utility vs marketing, country mix per recipient), your BSP’s margin, Meta’s volume discounts, and Meta’s quarterly rate-card updates.
- Mossmoon’s personal-API path doesn’t serve high-volume mass broadcast use cases. For those, the Business API is the structurally right tool and the per-message math fits the workload.
- For low-volume scenarios (many lines, few messages each), Business API can come out cheaper. The calculator will say so honestly when it does.
Use cases where the cost delta is largest.
Multi-tenant agencies
Onboarding 25-100+ client lines, each with hundreds of chats a month. Flat $15/line scales linearly; per-message Business API cost compounds across all clients.
Marketing agencies →International conversational support
Heavy WhatsApp traffic in EMEA, LATAM, or India. Per-message Business API rates per country add up fast, and since October 2026 that includes every reply. Flat per-line collapses the variable cost.
Read the path comparison →Real-estate or recruiting agent teams
Each agent has their own line. Messages per line are moderate, but $25/line BSP platform fees stack. Flat $15/line wins on both axes.
Real estate guide →About the math and the model.
Two components: Meta's per-message cost (the messages you send, multiplied by Meta's list rate for the selected country and message type) plus a monthly platform fee per line ($25 by default, a typical BSP hosting tier; set it to $0 if you would go direct to Meta's Cloud API).
Meta has billed per delivered message since July 1, 2025. Since October 1, 2026 it also bills replies you send inside the 24-hour customer service window, at the same rate as utility messages. Meta partners report the first 1,000 of those replies per number each month are free, so we subtract them. Messages your customers send you are not charged by Meta.
Real BSP bills include extras the calculator doesn't model: agent seats, template-approval workflows, integrations tiers, support tiers. So the BSP-side number is conservative; your actual bill is often higher than what we show.
$15 covers one active WhatsApp line per month: unlimited inbound and outbound messages, hosted always-on connection, signed webhooks, full REST API, and the first line is free for 7 days. Voice calling is +$5/line/mo with unlimited minutes. No per-message fees and no per-seat fees on your internal team using the dashboard.
Meta's USD list rates effective October 1, 2026, for marketing, utility, authentication, and service (reply) messages in each market. "Other" is Meta's own bucket for countries without a dedicated rate. Meta changes rates on January 1, April 1, July 1, and October 1; for current values, see Meta's official rate card.
These are list prices. Meta gives volume discounts on utility and authentication messages at high monthly volumes, so very large senders of those types pay somewhat less than shown.
Two structural reasons. First, our pricing model is flat per line, not per message, so message volume doesn't compound the bill. Second, we don't sit on Meta's Business API, so there's no per-message layer at all. See /blog/whatsapp-business-api-vs-personal-api for the deeper architectural comparison.
Low-volume scenarios where you have many lines but each sends few messages. Mossmoon charges per line regardless of usage; the Business API charges per message. In cheap markets with modest volume, Meta's per-message cost can stay below $15 per line a month, and the calculator will say so.
More importantly, Business API is the structurally right tool for mass-broadcast workloads (OTPs at scale, shipping notifications, marketing blasts) where templates and per-message pricing fit. Mossmoon doesn't serve that workload at all. The calculator's job is to show you the cost difference for conversational use cases.
Separate, toggle in the calculator. Voice-calling-enabled Mossmoon lines are $20/line/mo (Mossmoon messaging is $15), unlimited minutes, no per-minute fees. Useful for first-call qualification, FSBO outreach in real estate, phone screens in recruiting, international coaching calls. Business API doesn't natively offer WhatsApp voice as a packaged feature in most BSPs.
Yes, click "Copy link" in the result panel. The URL encodes your lines, messages, country, message type, calling choice, and platform fee, so teammates open the same scenario and see the same numbers.
The numbers check out? First line is free for 7 days.
Related reading: Business API vs personal API · WhatsApp vs SMS · Twilio comparison · WATI comparison · WhatsApp link generator · WhatsApp number checker