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MassTransit is the .NET messaging framework that keeps modern systems moving reliably, securely, and at scale.

From simple message consumers to saga state machines and routing slips, it gives teams powerful capabilities through a consistent programming model while reducing integration complexity and operational overhead.

With over 200 million downloads and more than 200,000 deployments worldwide, MassTransit is trusted by organizations of every size in over 150 countries.

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Features

Core Concept

Consumers and Endpoints

Build message-driven services with strongly typed consumers and automatic endpoint configuration. MassTransit resolves consumers through DI, manages message locks, and acknowledges only when processing succeeds.
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Core Feature

Automatic Broker Topology

Use message contracts and consumer definitions to create and validate queues, exchanges, topics, and subscriptions automatically. MassTransit keeps transport topology aligned with your code and conventions.
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Reliability

Retry, Redelivery, and Faults

Recover gracefully from transient and prolonged failures with retry and delayed redelivery policies. When processing fails, fault events and error queues provide clear paths for diagnosis and recovery.
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Reliability

Outbox Consistency

Prevent duplicate or premature publishes by buffering outbound messages until consumer or saga persistence succeeds. Choose in-memory outbox for speed or transactional outbox for durable delivery.
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Business Logic

Saga State Machines

Orchestrate long-running workflows with state, events, and correlation rules using an expressive C# state machine syntax. Persist saga state across messages to orchestrate complex distributed transactions.
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Business Logic

Routing Slips

Execute dynamic multi-step workflows with built-in compensation for distributed transactions. Routing slips support per-request itineraries and integrate naturally with sagas for visibility and recovery.
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Application Pattern

Request Client

Use asynchronous request/response when a service needs an immediate answer without blocking threads. MassTransit request clients handle responses, faults, and cancellation through a task-based API.
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Deployment

Transport Flexibility

Run the same messaging code across RabbitMQ, Azure Service Bus, Amazon SQS/SNS, SQL transport, and more. MassTransit provides a consistent programming model while exposing transport-specific capabilities when needed.
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Testimonials

MassTransit has fifteen years of production usage across industries. The alternatives don’t come close in maturity or operational depth.

Chief Architect, Financial Services

We compared build-vs-buy. The cost of maintaining our own messaging layer was multiples higher than licensing MassTransit.

CTO, Healthcare SaaS Provider

MassTransit insulated us from vendor lock-in. Moving from RabbitMQ to Azure Service Bus was a configuration change, not a redesign.

Chief Architect, Enterprise Retail

The job consumers and scheduling features saved us from writing a mini-scheduler. It was already there, production-ready.

Staff Engineer, HR Tech

License Pricing

Single Line

Perfect for small organizations with single product line
  • One product, including all services and deployments
  • Flat-rate pricing, no per-message or per-endpoint fees
  • Annual subscription with perpetual downgrade rights
  • Email support with a 72-hour response time

Multiple Line

Suitable for multiple product lines within an organization
  • Everything in Single Line
  • Multiple products, services, and deployments
  • Guidance for cross-team deployments and scaling
  • Email support with a 48-hour support response time
All payments are processed securely through Stripe and support major credit cards and bank transfers. Amounts shown are in US Dollars.
After direct payment, your license key is delivered within minutes to the email address you provide. If you prefer to pay by invoice, Contact Us directly.

Frequently Asked Questions

Which license do I need?
Choose Single-Line for one cohesive software product or system and the related services developed, versioned, and delivered together as one offering. Choose Multi-Line when your organization has multiple independent products, systems, or internal applications.
Do development and test environments require separate licenses?
No. Your license covers development, CI/CD, testing, staging, and production environments within the scope of the license.
Are there limits on developers, services, endpoints, deployments, or messages?
No. Licensing is not based on developer seats, services, endpoints, deployments, or message volume.
Can one key be used across multiple services and environments?
Yes. One key may be shared across all services, deployments, and environments covered by your license.
Are customer-specific, on-premises, or isolated deployments covered?
Yes, when they are deployments of the same covered product line. Separate products or independently delivered systems may require a Multi-Line license.
How can I purchase a license?
You can pay directly by card or bank transfer via the payment links above. For invoicing or purchase-order requirements, contact sales@massient.com so we can provide the details required.
When will I receive my license key?
License keys for direct payments are normally delivered within minutes to the email address provided during purchase. Invoice purchases are provided a temporary key until the invoice payment is received, after which the full subscription term license key is delivered.
How do licensing requirements differ between MassTransit v8 and v9?
MassTransit v9 and later require a MassTransit license. MassTransit v8 and earlier remain available under their original open-source licenses. Support for v8 ends December 31, 2026.
What happens when my subscription expires?
When your subscription expires, you retain perpetual rights to continue using any MassTransit version released during your active subscription period. A current, active subscription is required when upgrading to newer versions or requesting support. This ensures that an application built and deployed using MassTransit with a valid license will continue to run even after a subscription has expired.
Is there a free or discounted startup license?
Organizations with less than $1 million USD in gross annual revenue may qualify for a 100% license discount. The discounted license includes the licensed software but does not include commercial support.
Is there a free or discounted nonprofit license?
Nonprofit organizations with less than $1 million USD in annual expenses may qualify for a 100% license discount. The discounted license does not include commercial support.
How does licensing work for agencies and consultancies?
A Multi-Line license can cover multiple client projects that an agency or consultancy actively develops or maintains. If ownership or ongoing maintenance transfers to the client, the client needs its own appropriate license.

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Get more information on MassTransit, and find out how you can license MassTransit for use in your organization.