If you're sending somewhere north of 30,000 SMS segments a month and climbing, there's one number worth writing on a sticky note: 50,000. That's the point where your per-segment rate on ReadySMS steps down on its own — no plan to upgrade, no sales call, no button to press. You just cross it and the cheaper rate applies for the calendar month.
Full disclosure: I work at ReadySMS, so I'm describing our pricing here. But the mechanics of a volume crossover — and the mistakes people make forecasting around one — are the same wherever you send. If you're planning spend for a growing list, this is the math to get straight before your next big month.
The two tiers, and what "automatic" actually means
Here are the only numbers in play:
| Tier | Segments / month | Per segment | + carrier pass-through | All-in |
|---|---|---|---|---|
| Standard | 0–50,000 | $0.02 | $0.0045 | $0.0245 |
| Growth | 50,000+ | $0.016 | $0.0045 | $0.0205 |
The carrier pass-through is a flat $0.0045 per segment either way — we bill it as its own line item instead of rounding it into the per-message price, so your invoice stays legible. (More on why that matters in the $0.0045 line-item breakdown.)
"Automatic" means exactly what it says: once your account passes 50,000 outbound segments in a calendar month, the Growth rate applies. You don't select it. You don't get upsold into it. There's no annual commitment gating it. This matters for forecasting because you don't have to time an upgrade — you just have to know where the line is.
The blended cost curve — where the real number lives
Here's the part people get wrong. When you cross 50,000, the drop to $0.016 does not retroactively re-price your first 50,000 segments. Standard-tier segments stay at Standard, and the segments above 50,000 bill at Growth. So your effective, blended per-segment cost is a curve that only slowly approaches the Growth rate as volume grows.
Let me show it with numbers. Using the all-in rates ($0.0245 Standard, $0.0205 Growth):
| Monthly segments | Cost | Blended all-in / segment |
|---|---|---|
| 50,000 | $1,225.00 | $0.02450 |
| 60,000 | $1,225 + (10,000 × $0.0205) = $1,430.00 | $0.02383 |
| 75,000 | $1,225 + (25,000 × $0.0205) = $1,737.50 | $0.02317 |
| 100,000 | $1,225 + (50,000 × $0.0205) = $2,250.00 | $0.02250 |
| 200,000 | $1,225 + (150,000 × $0.0205) = $4,300.00 | $0.02150 |
At 60,000 segments — just barely over the line — you're only saving about $0.0007 per segment blended versus staying at Standard-equivalent pricing. That's roughly $40 for the month. Real, but small.
At 200,000 you're saving ~$0.003/segment blended, or about $600/month against paying Standard the whole way. The savings compound the further past 50,000 you go, because more of your volume sits in the cheaper band.
The practical takeaway: **being just over 50,000 barely helps.** The tier step-down rewards senders who clear the line comfortably, not by a hair.
Batching: don't scatter your sends across two calendar months
The crossover is measured per calendar month. That creates a real planning lever — and a real trap.
Say you have 80,000 segments to send over a rolling four-week window, but that window straddles a month boundary: 45,000 in the last week of March, 35,000 in the first week of April. Neither month clears 50,000, so every segment bills at Standard ($0.0245). Total: 80,000 × $0.0245 = $1,960.00.
Now compress the same 80,000 into a single calendar month:
- First 50,000 × $0.0245 = $1,225.00
- Next 30,000 × $0.0205 = $615.00
- Total: $1,840.00
Same messages, same list, $120 saved just by not splitting the volume across the boundary. If your sends are flexible — win-back sequences, evergreen promos, drip campaigns — clustering them into one calendar month is free money.
The flip side: don't manufacture volume you don't need just to hit a tier. Padding a list with dead contacts to cross 50,000 is a great way to torch deliverability and pay to text people who'll never convert. If you're wrestling with which lapsed contacts are worth keeping, the win-back segment cost ceiling post has the math on when a contact stops paying for itself.
Seasonal spikes: the tier resets every month
Because the tier is calendar-scoped, a seasonal business gets an interesting profile. An ecommerce brand that does 30,000 segments most months but 120,000 in November and December sits at Standard for ten months and drops into Growth for two.
That's fine — it's the point of an automatic tier. You're not locked into a plan you're overpaying for in the quiet months, and you're not stuck at the expensive rate during your peak. Run the peak month math:
- 120,000 segments in December
- First 50,000 × $0.0245 = $1,225.00
- Next 70,000 × $0.0205 = $1,435.00
- Total: $2,660.00, blended $0.02217/segment
Versus a flat Standard rate the whole way (120,000 × $0.0245 = $2,940), the auto-drop saves you $280 in your single busiest month — precisely when you're spending the most and the savings are most useful.
If you split that December surge across a Black Friday campaign in late November and a holiday push in December, you might land 60,000 in each month instead of 120,000 in one. Two months of just-over-the-line volume:
- Each month: 50,000 × $0.0245 + 10,000 × $0.0205 = $1,430.00
- Two months: $2,860.00
That's $200 more than concentrating the volume into December. Same lesson as batching: the tier rewards concentration, not spreading.
Message length quietly moves your crossover
One thing that trips up first-time forecasters: you cross the line on segments, not messages. A 160-character GSM-7 message is one segment. Add a single emoji and the whole message drops to a 70-character-per-segment unicode limit — so a 175-character promo with an emoji becomes 3 segments.
That means a 20,000-contact blast can be anywhere from 20,000 segments (one tidy GSM-7 message) to 60,000+ segments (a chatty unicode message that splits three ways). The second version clears the 50,000 Growth line on a single send; the first doesn't come close. Neither is wrong, but if you're forecasting spend, estimate in segments, not contacts. Our cost calculator does the segment math for you if you'd rather not count characters.
For agencies: the tier interacts with your rebill
If you resell SMS to clients, the automatic step-down is margin you can pocket, hold, or pass on. When your aggregate account volume crosses 50,000 — even if no single client does — your cost per segment drops while your rebill rate to clients probably stays flat. That spread is the whole game.
The full breakdown of what the Standard-to-Growth crossover adds to agency margin is in the tier breakpoint math post — short version, at 50,000 aggregate sends it's about $380/month of new margin if your client rate doesn't move. And if your volume keeps climbing past what Growth comfortably serves, there's a point where it's worth talking to the deal desk about enterprise pricing — though that's a conversation, not a public rate.
What to actually do with this
The whole thing reduces to a few rules:
- Estimate in segments, not contacts. Emoji and long copy multiply your count and can push you over 50,000 faster than you think.
- Cross the line comfortably or don't worry about it. Being 500 segments over saves you almost nothing; being 100,000 over is real money.
- Concentrate flexible sends into one calendar month rather than splitting across a boundary. The tier resets monthly, so straddling wastes the discount.
- Let seasonal peaks do their thing. The auto-drop kicks in exactly when your volume — and your bill — is highest, then steps back down when you slow.
Nothing here requires you to change plans, sign a contract, or forecast perfectly. The rate follows your actual volume each month. If you want to sanity-check a specific send against the tiers, plug it into the calculator or look at the full pricing page — the numbers there are the same ones I used above.