Azure Service Bus is a messaging infrastructure that sits between applications, allowing them to exchange messages for improved scale and resiliency.
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Service Bus comes in basic, standard and premium tiers. Here’s how they compare:
|Message size||256 KB||256 KB||1 MB|
|Brokered connections included||100||1,0001||1,000 per MU|
|Brokered connections (excess allowed)||(billable)||Up to 1,000 per MU|
|Geo-Disaster Recovery (Geo-DR)||
*Requires additional Service Bus Premium namespaces in another region.
An operation is any API call to the Service Bus service.
|Operations||$- per million operations|
|Base charge 1||$-/hour|
|First 13M ops/month||Included|
|Next 87M ops (13M–100M ops)/month||$- per million operations|
|Next 2,400M ops (100M–2,500M ops)/month||$- per million operations|
|Over 2,500M ops/month||$- per million operations|
Number of AMQP connections or HTTP calls to Service Bus.
|Next 99K (1K–100K)/month||$- per connection/month|
|Next 400K (100K–500K)/month||$- per connection/month|
|Over 500K/month||$- per connection/month|
|Brokered connections are not charged in the premium tier.|
Hybrid connections and Windows Communication Foundation (WCF) relaysHybrid connections are charged per listener unit and for any data overage exceeding the included 5 GB/month. WCF relays are charged by message volume and relay hours.
|Hybrid Connection Pricing|
|Connection charge (includes 5 GB of data/month)||$- per listener|
|Data transfer overage (data exceeding the included 5 GB/month)*||$-/GB|
*The data transfer limit of 5 GB covers total data transfer across all listener units.
|WCF Relay Pricing|
|Relay hours||$- for every 100 relay hours|
|Messages||$- for every 10,000 messages|
The monthly prices are calculated based on 730 hours of usage. Connections will be charged in one-hour increments.
The relay counts each message sent to the relay, and each message sent by the relay, as billable. A billable message is a data frame of at most 64 KB. If a message exceeds 64 KB, such as an HTTP reply that returns an image, each further 64 KB counts as an additional billable message. For a normal relayed service that implements a request/response scheme, the request first travels to the relay, then to the service, and the reply traverses the same path. That amounts to at least four billable messages. For a multicast service that has 4 listeners, the message sent to the relay counts as 1 message, and the 4 messages sent to the listeners also each count as a message, resulting in a total of 5 messages.
For brokered entities (queues and topics or subscriptions), an operation is any API interaction with Service Bus service on any protocol.
A send, receive, delete for a message that's less than or equal to 64 KB in size is considered to be one billable operation. If the message is greater than 64 KB in size, the number of billable operations is calculated according to the message size in multiples of 64 KB. For example, an 8 KB message sent to the Service Bus will be billed as one operation, but a 96 KB message sent to the Service Bus will be billed as two operations. Reading the 8 KB message with a lock and then completing or explicitly abandoning the message will be billed as two operations. Renewing the lock on a message also incurs an operation.
Multiple deliveries of the same message (for example, message fan-out to multiple subscribers or message retrieval after abandon, deferral or dead lettering) will be counted as independent operations. For example, in the case of a topic with three subscriptions, a single 64 KB message sent and subsequently received will generate four billable operations – one "in" plus three "out", assuming all messages are delivered to all subscriptions and deleted during reading.
Additionally, creating, reading (listing), updating and deleting a queue, topic or subscription will each incur an operation charge.
Operations are API calls made against queue, topic or subscription service endpoints. This includes management, send/receive and session state operations.
Operation Type Description Management Create, read, update, delete against queues, topics or subscriptions Messaging Sending and receiving messages with queues, topics or subscriptions Session state Getting or setting session state on a queue, topic or subscription Premium tier does not charge for operations up to the purchased capacity limit.
Relay hours are billed for the cumulative amount of time during which each Service Bus Relay is "open". A relay is implicitly instantiated and opened at a given Service Bus address (service namespace URL) when a relay-enabled WCF service, or "relay listener", first connects to that address. It's only closed when the last listener disconnects from its address. Therefore, for billing purposes a relay is considered "open" from the time the first relay listener connects until the time the last relay listener disconnects from the Service Bus address of that relay.
A brokered connection is defined as one of the following:
- An AMQP connection from a client into a Service Bus topic, subscription, queue or event hub.
- An HTTP call to receive a message from a Service Bus topic or queue that has a receive timeout value greater than zero.
Microsoft charges for the peak number of concurrent brokered connections that exceed the included quantity (1,000 in the standard and premium tiers). Peaks are measured on an hourly basis, prorated by dividing by 730 hours in a month and added up over the monthly billing period. The included quantity (1,000 brokered connections per month) is applied at the end of the billing period against the sum of the prorated hourly peaks.
- 5,000 clients each connect via a single AMQP connection and receive commands from a Service Bus topic and send events to queues. If all clients connect for 12 hours every day, you will see the following connection charges (in addition to any other Service Bus charges): 5,000 connections * 12 hours * 30.5 days/730 = 2,500 brokered connections. After the monthly allowance of 1,000 brokered connections, you would be charged for 1,500 brokered connections.
- 5,000 clients receive messages from a Service Bus queue via HTTP, specifying a non-zero timeout. If all devices connect for 12 hours every day, you will see the following connection charges (in addition to any other Service Bus charges): 5,000 HTTP receive connections * 12 hours per day * 30.5 days/730 hours = 2,500 brokered connections.
Yes, they do. There are no connection charges for sending events using HTTP, regardless of the number of sending systems or devices. Receiving events with HTTP using a timeout greater than zero, sometimes called "long polling", generates brokered connection charges. AMQP connections generate brokered connection charges regardless of whether the connections are being used to send or receive. Note that 100 brokered connections are allowed at no charge in a basic namespace; this is also the maximum number of brokered connections allowed for the Azure subscription. The first 1,000 brokered connections across any and all standard namespaces in an Azure subscription are included at no extra charge (beyond the base charge). As these allowances are enough to cover many service-to-service messaging scenarios, brokered connection charges usually only become relevant if you plan to use AMQP or HTTP long-polling with a large number of clients, for example to achieve more efficient event streaming or enable bi-directional communication with thousands or millions of devices or app instances.
No, the standard base charge is billed only once per month per Azure subscription. This means that after you create a single standard tier Service Bus namespace, you will be able to create as many additional standard tier namespaces as you like under that same Azure subscription without incurring additional base charges.
The premium tier of Service Bus messaging provides all the messaging features of Azure Service Bus queues and topics with predictable, repeatable performance, higher throughput and improved availability. The premium tier uses a dedicated resource allocation model to provide workload isolation and consistent performance. Because the compute and memory resources in the premium tier are dedicated, there are no per-message transaction charges as in other tiers. All transactions are included in the message unit allocation.
A messaging unit is a set of dedicated resources exclusively reserved for premium namespaces. This resource set can deliver consistent and repeatable performance of messaging workloads. Each premium namespace can have 1, 2 or 4 messaging units and the resource allocation grows linearly: 2 messaging units will consist of twice as many resources allocated as 1 messaging unit.
The premium tier of Service Bus messaging is a flat daily rate per messaging unit purchased. Namespaces created as premium can have 1, 2 or 4 messaging units, which will each accrue the given number of messaging unit daily rate charges. Premium namespaces can have the number of purchased messaging units changed at any time, but the daily rate is based on the maximum number of message units assigned to the namespace at any time.
Yes, it's technically possible to upgrade and downgrade between premium and other tiers. For guidelines on how to migrate your solution from standard messaging to premium messaging, please read this blog post.
A hybrid connection allows you to establish bi-directional, binary stream communication between two networked applications, and one or both parties can reside behind NATs or firewalls. The listener that accepts this relayed connection and the sender that initiates the connection can both be implemented on any platform, and in any language, that has a basic WebSocket capability, including the WebSocket API in most web browsers.
When you create your first hybrid connection listener you will be charged at a per listener unit rate. The same rate applies to each individual listener that you decide to create. 5 GB of free data transfer per month is included with the service. You can use the 5 GB of free data transfer across all of your listener units. You will be charged for data transfer overage if your aggregate data transfer across all listener units is more than 5 GB.
Sample pricing 1 – If you have a single listener, such as an instance of the hybrid connections manager installed and continuously running for the entire month, and you send 3 GB of data across the connection during the course of the month, your total charge will be $-.
Sample pricing 2 – If you have a single listener, such as an instance of the hybrid connections manager installed and continuously running for the entire month, and you send 10 GB of data across the connection during the course of the month, your total charge will be $-. That's based on $- for the connection and first 5 GB plus $- for the additional 5 GB of data.
Sample pricing 3 – If you have two instances, A and B, of the hybrid connections manager installed and continuously running for the entire month, and you send 3 GB of data across connection A, and 6 GB across connection B, for a total of 9 GB of data, your total charge will be $-. That's based on $- for connection A plus $- for connection B plus $- for the additional 4 GB of data overage.
We will charge 64 KB for each connection to your listener. This will be deducted from the 5 GB free that we offer each month with listener units. The listener unit charge is calculated per hour in increments of 5 minutes. You will not be charged for multiple opens and closes for dev/test purposes.
If you open a connection and do not transfer any data, we will transfer 1 KB each minute on your behalf to keep the connection alive. We do this so the network doesn’t auto-close the connection every few minutes. The associated cost to do this for one connected listener is less than $0.05 per month.
Please see this article for additional Service Bus billing FAQs.
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