QuickAuth Transactional SMS API
QuickAuth Transactional SMS API combines authentication and business messaging for WhatsApp, SMS, RCS, and email through one API.
What QuickAuth Transactional SMS API is
QuickAuth Transactional SMS API combines authentication and business messaging for WhatsApp, SMS, RCS, and email through one API. OTP delivery can try WhatsApp first and automatically fall back to DLT-registered SMS when WhatsApp does not deliver. SDKs for Android and iOS support OTP auto-read or autofill, while the HTTP API offers webhooks, server-side retries, and fallback. Additional SDKs target web, React Native, and Flutter. Bulk WhatsApp campaigns can use multiple WABAs, rechecking sender and template health between waves. Campaign tools track template button taps by recipient and campaign and support audience segmentation. QuickAuth describes fraud controls using suspicious-prefix scores, traffic heuristics, IP and device quotas, and optional device fingerprinting. Data is said to remain in Mumbai, phone numbers are hashed, and OTPs are deleted five minutes after verification. A free tier requires no credit card. Custom-volume prices are quoted within 24 hours, with DLT registration, sender IDs, and template approvals included at no extra charge.
Good
- WhatsApp-first OTP with SMS fallback
- SDKs support Android and iOS autofill
- Webhooks, retries, and delivery fallback
- Free tier without a credit card
- DLT setup included at no extra charge
Watch out
- Paid pricing requires a custom quote
- No fixed public price list
- OTP data handling is tied to stated policies
- Bulk campaigns depend on WhatsApp setup
Who it suits
QuickAuth suits teams implementing OTP authentication, WhatsApp campaigns, or multi-channel messaging through APIs and SDKs. It fits businesses needing webhooks, delivery status, fallback routing, and fraud controls.
Verdict
QuickAuth provides a broad messaging API with OTP routing, SDK support, campaign tools, and onboarding help. The free tier lowers entry cost, while paid plans require volume-based quotation.
Plans and prices
From QuickAuth Transactional SMS API's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Custom volume pricing | Priced on request | Volume-based pricing · DLT registration included · authentication and bulk WhatsApp combined in one INR agreement · Quoted within 24 hours based on monthly volume, channel mix, template categorization, and fallback patterns |
The facts
Each one read from QuickAuth Transactional SMS API's own pages, with the date it was checked.
What it does
- API and SDKs
- The HTTP API supports webhooks, server-side retries, and fallback, with SDKs for web, React Native, iOS, Android, and Flutter.checked 4 Oct 2026
- Bulk messaging
- Bulk WhatsApp campaigns can use a pool of WABAs, with sender and template health rechecked between waves.checked 4 Oct 2026
- Campaign analytics
- The platform says it tracks WhatsApp template button taps per recipient and campaign and offers audience segmentation.checked 4 Oct 2026
- Data and compliance
- QuickAuth says data is stored in Mumbai, phone numbers are hashed, OTPs are deleted five minutes after verification, and the service is SOC 2 Type II and aligned with India's DPDP Act 2023.checked 4 Oct 2026
- DLT setup
- QuickAuth says its team handles DLT registration, sender IDs, and template approvals, usually within 24 hours, at no extra charge.checked 4 Oct 2026
- Fraud controls
- The service describes suspicious-prefix scoring, velocity and ratio heuristics, per-IP and per-device quotas, and optional device fingerprinting to limit SMS-pumping fraud.checked 4 Oct 2026
- OTP autofill
- Its SDK supports OTP auto-read or autofill on Android and iOS.checked 4 Oct 2026
- OTP routing
- OTP can be sent over WhatsApp first with DLT-registered SMS as an automatic fallback when WhatsApp does not deliver.checked 4 Oct 2026
- Pricing limits
- The company does not publish a fixed price list; quotes depend on monthly volume, channel mix, template categories, and fallback patterns.checked 4 Oct 2026
- Product
- QuickAuth provides one API for authentication, WhatsApp, SMS, RCS, and email messaging.checked 4 Oct 2026
- Support
- The site offers human onboarding and says its team typically starts DLT, WABA, and Meta verification setup within a few hours, with a response within 24 hours.checked 4 Oct 2026
Money
- Free tier
- The site states that a free tier is included and no credit card is required.checked 4 Oct 2026
Alternatives to QuickAuth Transactional SMS API
- 1
Mailchimp
Free planAndroidiOSWebAPI8.3From $13 a month - 2
Textmagic
Free planAndroidiOSWebAPI8.2Free plan - 3
ClickSend SMS API
AndroidiOSWebAPI8.0From $3.46 a month - 4
Commio SMS API
Free planAndroidiOSWebAPI7.9From $0.25 a month - 5
LINK Mobility SMS API
Free planAndroidiOSWebAPI7.9From zł49 a month - 6
Callr
AndroidiOSWebAPI7.6From €599 a month