SMS and messaging APIs · Comparison
Sinch SMS API vs Telnyx Messaging API
2 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
| Metric | Sinch SMS API | Telnyx Messaging API |
|---|---|---|
| What you're paying for | 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 | 7.6 | 8.2Best |
| Free option | Free trial | Free trial |
| Card to start | No card needed | No card needed |
| Getting access | Self-serve | Self-serve |
| Starter priceCheapest paid plan | $0.0078/message | $0.004/SMS part |
| Pricing model | Usage-based | Usage-based |
| Pricing page | Public prices | Public prices |
| US SMS rate (10DLC) | $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 $0.0050 (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 | $1.00/mo plus $1.00 setup | $1.00/mo plus $0.10/mo for SMS and MMS |
| 10DLC registration fees | 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) | $134.00, computed | $85.89, computed |
| Free option | 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 | Not published; contact sales | Published tiers, from 100M parts/mo on local numbers |
| SOC 2 / ISO 27001 | 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 | Product-level BAAs offered; SMS API not named | Yes, US messaging traffic only; rate sheet lists $2,500/mo |
| Non-US data region | EU (Ireland, Sweden), Australia, Brazil, Canada through the account manager | EU (Germany), Australia, UAE or Canada, chosen once |
| Opt-out handling | Automatic STOP blocking once consent management is switched on (Conversation API) | Automatic STOP and similar keywords; AI detection $0.002 per message |
| SSO | SAML in Sinch Build; no plan condition stated | SAML through Organizations; no plan gate stated |
| Bottom line | 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: 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 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.
- Sinch SMS APILowest priceLocal number (10DLC)$1.00/moPlus $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 APILocal 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: 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
- Sinch SMS API$0.0078/message for the Pay as you go 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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