01
Ingest
Direct injection.
A single endpoint. REST or SMTP. Messages are signed, validated and queued in a median of 11 milliseconds — anywhere on earth.
- p50
- 11ms
- p99
- 38ms
- Regions
- 14
The Transactional Email API
built to deliver on time.
Sendvrel combines high-deliverability infrastructure, real-time visibility,
and intelligent routing in one unified platform.
SECURE
FAST
SCALABLE
DKIM/SPF
REAL-TIME LOGS
IP WARMING
AI ROUTING
240+ EDGE POPS
SECURE
FAST
SCALABLE
DKIM/SPF
REAL-TIME LOGS
IP WARMING
AI ROUTING
240+ EDGE POPS
Live Telemetry
The backbone, in action.
New Message
To: sai@sendvrel.kystron.com
Sub: Critical Auth Code
SENDING...
Welcome to Sendvrel
Inbox • Now
Hey Sai, your critical authentication code has arrived safely.
Verified Sender
New Message
To:sai@sendvrel.kystron.com
Sub:Critical Auth Code
Edge PoP
Core Backbone
Routing Engine
Welcome to Sendvrel
Inbox • Now
Hey Sai, your critical authentication code has arrived safely.
Verified Sender
Built for the inbox.
Engineered for the net.
Three layers of engineering. One unified pipeline. We've built a multi-region ingestion mesh, a proprietary ISP decision engine, and a real-time event streaming core. The same infrastructure trusted by hyper-growth startups and global enterprise platforms.
Ingestion Mesh
14 Global Regions
Decision Engine
42 ISP Pools
Streaming Core
180ms Latency
Scale Ready
Unlimited Throughput
02
Route
Smart routing.
Forty-plus IP pools, continuously scored against ISP signals. Each send is routed down the path most likely to land in the inbox.
- Pools
- 42
- Inbox rate
- 99.2%
- Failover
- <2s
03
Observe
Live telemetry.
Every event — accepted, deferred, opened, clicked, complained — streamed to your stack with sub-second latency. Nothing buffered.
- Latency
- 180ms
- Retention
- 90d
- Webhooks
- ∞
telemetry.tsp-scale.io
HTTP/2 202Ingestion_Active
// 11ms median
POST /v1/messages
{
"to": "ada@lovelace.co",
"template": "receipt.v3",
"vars": { "amount": 4200 }
}Payload Signed11.2ms
Developer Experience
Send OTPs. Zero Latency.
Experience millisecond precision. Watch live telemetry and inspect backbone logs.
Simulation Config
Avg Latency
3.8ms
Delivery Rate
99.99%
PoP_SFO
PoP_TYO
PoP_LHR
Backbone Core
Intelligent routing
Gmail_MX
Outlook_MX
Status
Ready
Security
mTLS + AES
P99 Latency
--
Jitter
--
Capabilities
OTP delivery and inboxes
are disconnected.
Different systems. Broken flow.
Instead of stitching multiple tools together, Sendvrel keeps send, delivery state, and inbox outcomes in a single operational loop.
One flow. One truth.
Your team gets faster debugging, cleaner monitoring, and a smoother authentication experience for end users.
One flow One source of truth No missed codes
This is why codes fail.
Fragmented systems lead to broken login flows. When your sending infrastructure and inbox visibility live in separate silos, the bottleneck most teams miss appears during real traffic spikes.
System Isolation
Visibility Silos
Traffic Spikes
Explore Feature
Unified Delivery.
Send events and responses in one connected workflow. We capture every provider response, retry attempt, and final message status in a single, unified timeline.
Real-time Events
Auto-Retries
Unified Timeline
Explore Feature
Send from your domain.
Trusted delivery with full routing control. Integrate once with our API and maintain full ownership over your sender reputation and security standards.
Custom Domains
Reputation Guard
API Integration
Explore Feature
Full message tracking.
Trace every issue in seconds, not hours. Our per-packet telemetry allows you to see exactly where a message is delayed or why it was rejected by the ISP.
Packet Telemetry
ISP Debugging
Delay Analysis
Explore Feature
Zero friction logins.
No delays. No missed codes. Just delivery. Ensure your users receive verification emails instantly, maintaining a seamless authentication experience.
Instant Delivery
Frictionless Flow
High Success Rate
Explore Feature
Architecture
Zero-compromise stack.
Built for speed.
High-performance infrastructure built for the next generation of SaaS. Delivering transactional messages in milliseconds.
Sub-5ms Latency
Deliver transactional messages in milliseconds with globally distributed edge ingress.
Dedicated IP Control
Protect sender reputation with isolated IP pools and guided warm-up automation.
Adaptive Routing
Continuously reroute around congestion and provider disruptions in real time.
Enterprise Security
End-to-end encryption, SPF/DKIM/DMARC defaults, and hardened infrastructure controls.
Developer Experience
Clear APIs, official SDKs, and quick-start guides made for shipping teams.
Full Observability
Inspect every event from accepted to delivered with searchable per-message timelines.
The Decision Engine
Engineered for the elite.
Benchmark ready.
A benchmark-driven comparison of the world's most robust delivery networks. Verified by independent telemetry.
Feature
Brevo
Infrastructure Performance
Anycast Network Nodes
Regional
Global Fiber
Median delivery latency
650 ms
< 180 ms
Throughput per account
500k / hour
Unlimited
Dedicated IP pools
Add-on
Included
Uptime SLA
99.9%
99.999%
Next-Gen Deliverability
The Ghost Sender (Reputation)
—
Included
Live Spam Folder Simulation
—
Real-time
Predictive Best-Time Delivery
—
AI-Driven
Heuristic Trigger Analysis
—
Forensic
One-Click SDK Migrator
—
Native
Security & Compliance
Zero-Knowledge Encryption
—
RSA-4096
Self-Destructing Mail
—
Included
Private Network Routing
—
✓
SOC 2 Type II / HIPAA
✓
✓
24/7 Incident Response
Business hrs
Instant
Elite Features
The infrastructure of the 1%.
Zero-Knowledge Messaging
Your email content is encrypted with RSA-4096 at the edge. We cannot read your transactional data, even if compelled. Your privacy is mathematically guaranteed.
Anycast Any-Point
Traffic is routed to the nearest available node over a global fiber backbone. Zero hops through the public internet.
AI Reputation
Machine learning models monitor ISP feedback and automatically adjust delivery patterns.
DMARC Auto-Pilot
Automatic configuration of security standards with real-time verification of domain health.
Dedicated Nodes
Physical hardware isolation for high-volume senders, ensuring 100% resource availability.
Performance
Built for absolute speed.
Traditional email APIs take seconds to process and route your messages. Our edge-mesh architecture delivers sub-50ms ingestion latencies.
Live Ingestion Latency (p50)
Lower is betterSendvrel Live Data11.0ms
Amazon SES840ms
SendGrid1250ms
240+
Edge Nodes
<2s
Failover Time
Rust
Core Engine
Developers
Built for modern engineers.
Simple REST APIs, official SDKs, and comprehensive documentation to get you delivering in minutes.
Go from first request to production-ready messaging with predictable delivery behavior, detailed event telemetry, and clear failure diagnostics designed for fast incident response.
1
curl -X POST https://api.sendvrel.kystron.com/v1/emails/send \2
-H "Authorization: Bearer $KEY" \3
-H "Content-Type: application/json" \4
-d '{'5
"to": "user@company.in",6
"subject": "System Alert",7
"body": "Your email here"8
}'Pricing
Simple pricing that scales with your growth.
Start free for development, then upgrade as your volume and reliability requirements increase.
Starter
$0
For early-stage products
• 1,500 emails / month
• 3 verified domains
• Zero-Knowledge Storage
Professional
$25
For scaling SaaS teams
• 50,000 emails / month
• 25 verified domains
• Webhooks & Spam Tests
Enterprise
$149
For high-volume operations
• 500,000 emails / month
• Unlimited domains
• Zero-Knowledge AES-256
Questions
Frequently asked questions.
Everything you need to know about our architecture, performance, and features.
0
Emails Delivered
0.00%
Uptime SLA
0.0ms
Avg Latency
0+
Global PoPs