Deliver transactional alerts, fast OTP verification, and WhatsApp workflows through high-throughput REST APIs and practical developer tools.
We combine robust routing, simple developer tools, and transparent pricing to power mission-critical communications.
OTP verification and transactional alerts delivered through priority queues with real-time delivery tracking.
Predictable usage-based rates that scale down with your message volume without setup fees or hidden platform charges.
Simple REST API endpoints, webhooks, and sample code for Node.js, Python, PHP, Java, and cURL.
Scalable messaging tools and APIs engineered for modern application workflows
Send scheduled customer updates, transactional notifications, and campaign broadcasts with real-time status reporting.
Deliver security verification codes to application users in 1–3 seconds with priority gateway routing and 99.9% uptime.
Deploy multi-channel authentication and notification workflows directly to customer WhatsApp applications.
Plans designed for growing messaging volumes with zero setup charges or hidden platform overhead
Compare volume rates for SMS and WhatsApp messaging channels
Speak with our solutions team for enterprise SLAs, custom TPS allocation, and dedicated account support
Create your account and integrate our high-speed messaging API into your application in minutes.
Tailored communication tools engineered to support fintech, e-commerce, software, and enterprise applications.
Reliable APIs to power user onboarding, authentication, and notification flows.
Flexible messaging integration for web apps and client portals.
Critical alerts, appointment updates, and notification systems.
High-throughput routes, dedicated SLA support, and account management.
Clean REST APIs, webhooks, and flexible client integration kits.
Create your account in under 2 minutes and begin testing live message delivery.
Telecom engineers and systems specialists managing carrier integrations and route reliability
CEO & Platform Architect
10+ years experience in telecom infrastructure and enterprise SMS gateway operations.
Chief Technology Officer
Specializes in high-throughput REST API gateway development and carrier integrations.
Here is how engineering and product teams evaluate BLACKSMS for their messaging workflows
"BLACKSMS simplified our customer verification process. Delivery times are consistent and the API documentation made setup straightforward."
E-Commerce Product Lead
"Integrating the REST API into our authentication flow took less than an hour. The OTP delivery speed has been excellent for user signup."
SaaS Platform Co-Founder
"Clear volume pricing with zero hidden fees. BLACKSMS has been a dependable partner for our transactional customer notifications."
Engineering Operations Lead
Clear answers to common technical, compliance, and integration questions
BLACKSMS provides carrier-approved transactional and OTP routing channels operating with compliant headers and template matching under TRAI TCCCPR rules.
We support primary business messaging channels:
Pricing is strictly usage-based with volume discount tiers starting at ₹0.30/msg and scaling down for higher message commitments with zero hidden fees.
Integration requires sending a standard REST HTTP POST request with your API key. Example request using cURL:
Have specific technical or enterprise questions?
Contact Engineering Support
