SMS and messaging APIs · Comparison

Plivo SMS API vs Sinch SMS API vs Telnyx Messaging API

3 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.

Side by side

Plivo SMS API vs Sinch SMS API vs Telnyx Messaging API: value, access facts, plan limits and bottom lines
Metric	Plivo SMS API	Sinch SMS API	Telnyx Messaging API
What you're paying for	Worth the priceFor brands spending $1,000 a month or more, low published US rates and a full fee sheet, with opt-outs and 10DLC registration handled by the platform.	Built-in reachPrepaid SMS priced for 241 countries from one account, with US 10DLC registration in the same dashboard or API and a SOC 2 Type II that names the SMS API.	Worth the priceUS texting at $0.004 a part, the lowest published rate in this group, with carrier and 10DLC fees passed through at cost and every messaging rate public.
Overall score	4.6	7.6	8.2Best
Free option	Paid only	Free trial	Free trial
Card to start	–Not measured	No card needed	No card needed
Getting access	Sales call required	Self-serve	Self-serve
Starter priceCheapest paid plan	$1,000/mo minimum	$0.0078/message	$0.004/SMS part
Pricing model	Seat + usage	Usage-based	Usage-based
Pricing page	Public prices	Public prices	Public prices
US SMS rate (10DLC)	$0.0077 per segment, outbound or inbound (list rate)	$0.0078 per message, outbound or inbound	$0.004 per part, outbound or inbound
US carrier fees	Per carrier: AT&T $0.0035, T-Mobile $0.0045, Verizon $0.005 (outbound)	Per carrier: AT&T $0.0035, T-Mobile $0.0045, Verizon $0.0050 (outbound; carrier fee article of Oct 1, 2026)	Per carrier, no markup: AT&T $0.0035, T-Mobile $0.0045, Verizon $0.0045 (outbound)
Local number	$0.50/mo	$1.00/mo plus $1.00 setup	$1.00/mo plus $0.10/mo for SMS and MMS
10DLC registration fees	Brand $4.50, campaign vetting $15, $1.50/mo low-volume campaign (billed quarterly)	Brand $4, campaign review $15 per submission, $10/mo standard or $1.50/mo low-volume mixed (under 10k SMS/mo); optional vetting $41.50	Passed through: brand $4.50, campaign review $15, $1.50/mo low-volume mixed
Reference scenario (10,000 US texts/mo)	$1,046.46 with the $1,000 minimum, computed ($123.96 at list rates alone)	$134.00, computed	$85.89, computed
Free option	None for SMS; the $10 trial covers voice products	Trial credit, no card ($2 for US accounts per archived help); texting sandbox	$5 testing credit after a fraud review, no card; texts only to your own verified number
Volume discounts	Enterprise plan only, by sales	Not published; contact sales	Published tiers, from 100M parts/mo on local numbers
SOC 2 / ISO 27001	SOC 2 Type II (FAQ); ISO 27001 not stated	SOC 2 Type II naming the SMS API; group ISO 27001 certificate	SOC 2 Type 1 and Type 2; ISO 27001:2013 (scope not stated)
HIPAA BAA	Offered; listed on the Enterprise plan	Product-level BAAs offered; SMS API not named	Yes, US messaging traffic only; rate sheet lists $2,500/mo
Non-US data region	No (the India region has no SMS)	EU (Ireland, Sweden), Australia, Brazil, Canada through the account manager	EU (Germany), Australia, UAE or Canada, chosen once
Opt-out handling	Automatic STOP/HELP on US and Canadian long code and toll-free	Automatic STOP blocking once consent management is switched on (Conversation API)	Automatic STOP and similar keywords; AI detection $0.002 per message
SSO	Enterprise plan, by sales	SAML in Sinch Build; no plan condition stated	SAML through Organizations; no plan gate stated
Bottom line	From its public pages, Plivo lists low US rates and every US fee, with opt-outs and 10DLC registration built in. SMS now needs an Enterprise contract with a $1,000 monthly minimum, and some pages still describe pay-as-you-go.	From its public pages, Sinch offers a prepaid SMS API with per-country prices, SAML SSO, non-US servers and a SOC 2 Type II for SMS. Its US carrier and 10DLC fees sit in help articles that call them "only indications".	From its public pages, Telnyx has the lowest published US rate and scenario figure in this group, with every fee itemized and passed through at cost. US 10DLC needs the Verified tier with KYC, the trial is narrow, and several pages disagree on fees and plans.

Evidence: Plivo SMS API: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Sinch SMS API: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Telnyx Messaging API: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.

When to pick each

In the words of each review, with the date its facts were checked.

From our Plivo SMS API review
Checked Oct 15, 2026
Pick Plivo SMS API when
You will spend $1,000 a month or more on Plivo anyway and want Verify with no per-verification fee.
Pick Telnyx Messaging API when
You want self-serve pay-as-you-go at $0.004 per part ($85.89 a month for our scenario), a $5 trial credit, ISO 27001 and an EU data region.
From our Plivo SMS API review
Checked Oct 15, 2026
Pick Plivo SMS API when
You want 10DLC and carrier fee tables in dated docs and a price sheet, and a BAA offered on the plan that carries SMS.
Pick Sinch SMS API when
You want prepaid pay-as-you-go with no monthly minimum ($134.00 a month for our scenario), EU and other API regions, and a DPA in the terms.
From our Sinch SMS API review
Checked Oct 15, 2026
Pick Sinch SMS API when
You want a texting sandbox for tests and a DPA that is part of the online terms.
Pick Telnyx Messaging API when
Price leads: our scenario is $85.89 a month at Telnyx against $134.00 here, with carrier fees and volume tiers on its own pricing page.
From our Telnyx Messaging API review
Checked Oct 15, 2026
Pick Telnyx Messaging API when
You want carrier fees on the pricing page itself, published volume tiers and a lower scenario figure ($85.89 against $134.00).
Pick Sinch SMS API when
You want a sandbox for simulated test messages that do not bill, and a DPA that is part of the online terms.

Entry price

Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.

Plivo SMS APILowest price
Long code number
$0.50/mo
Per number; billed for the full month when removed mid-month
- Toll-free number $1.00/mo
- 10DLC: brand $4.50, campaign vetting $15, $1.50/mo low-volume or $10/mo standard campaign
Sinch SMS API
Local number (10DLC)
$1.00/mo
Plus $1.00 one-time setup
- 10DLC fees (fee article, updated Sep 17, 2026): brand $4, campaign review $15 per submission, low-volume mixed campaign $1.50/mo (under 10k SMS a month), most other campaigns $10/mo
- Campaign fees billed 3 months up front
Telnyx Messaging API
Local number (10DLC)
$1.10/mo
$1/mo per local number plus $0.10/mo to add SMS and MMS; no setup fee listed
- 10DLC fees passed through at cost: brand $4.50, campaign review $15
- Low-volume mixed campaign $1.50/mo; standard campaign $10/mo

Prices as listed on each pricing page, in USD per month, excluding tax. Observed: Plivo SMS API 2026-10-15, Sinch SMS API 2026-10-15, Telnyx Messaging API 2026-10-15.

Which one fits

If you need to start today without a sales call: Telnyx Messaging APISelf-serve sign-up, no card needed; the highest score of the 2 self-serve products here (8.2/10).
If you want to try it without entering a card: Telnyx Messaging APIFree trial, no card needed, and the highest score of the 2 that skip the card (8.2/10).
Lowest starter price: Plivo SMS API$1,000/mo minimum for the Enterprise (USD 1,000/month minimum commitment) plan.
Highest overall score: Telnyx Messaging API8.2/10 (Excellent). The review shows the score breakdown and the run behind it.

Picked by fixed rules from the table above, not by hand. How we score

Full reviews

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