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Serverless Instance Costs

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  • Usage Cost Summary
  • Read Processing Unit Pricing
  • Payment Methods

Serverless instances offer pay-per-operation pricing, meaning that you only pay for the Processing Units consumed by your database operations and storage consumed by your data and indexes. You do not need to specify a cluster size since serverless instances seamlessly scale to accommodate changes in workload traffic.

Serverless instances may be more cost effective for applications with low or intermittent traffic. To learn more about serverless instances and use cases, see Choose a Database Deployment Type.

Note

Expiration operations triggered by TTL Indexes might generate RPUs and WPUs . The volume of these additional processing units typically incurs only a small fee relative to your overall costs.

Operation pricing varies between cloud providers and geographic regions. All operations are billed per day.

Name
Description
Price
Read Processing Unit (RPU)

Read operations to the database.

Atlas calculates RPUs based on the number of read operations, document bytes read (in 4KB increments), and index bytes read (in 256 byte increments) per operation. RPUs are calculated on a daily basis and start at 0 each day.

The price for each million RPUs decreases based on volume of reads in a day. Starting prices range from $0.09 to $0.22 per million RPUs. [1] See Read Processing Unit Pricing for price tier details.
Write Processing Unit (WPU)

Write operations to the database.

Atlas calculates WPUs based on document bytes and index bytes written (up to 1KB). If a document and index exceed 1KB, Atlas covers each excess chunk of 1KB with an additional WPU. Atlas calculates WPUs on a daily basis and WPUs start at 0 each day.

Range from $0.90 to $2.20 per million WPUs. [1]
Storage
Logical document and index storage. This value includes the number of bytes of all uncompressed BSON documents stored in all collections, plus the bytes stored in their associated indexes.
Range from $0.20 to $0.70 per GB per month.
Continuous Backup
Point-in-Time backups triggered by write events.
Range from $0.20 to $0.60 per GB per month.
Restore from Backup

The time required to restore your serverless instance.

Important

Data transfer as part of the backup and restore process is charged separately.

Range from $2.50 to $6.00 per restore hour.
Data Transfer

Data transfer to and from the database. [1]

Tip

If your data transfer costs are a significant portion of your bill, see How to Reduce Data Transfer Costs.

  • Regional: $0.01 per GB for all cloud providers and regions.

  • Cross-Region: range from $0.02 to $0.20 per GB.

  • Public Internet: range from $0.09 to $0.20 per GB.

[1](1, 2, 3) RPU and WPU prices are presented per million, but you are only charged for the amount you use. For example, if WPUs cost $1.25 per million in your region; using 500,000 would cost $0.63. The same is true for data transfer: you're only charged for the amount you transfer.

The price for each million (M) RPUs depends on volume of reads that day. RPUs start at 0 each day. Prices are in cascading tiers:

Tier
Description
Price
0-50 M RPUs
The first 50 million RPUs in a day.
$0.09 to $0.22/M
50-550 M RPUs
The next 500 million RPUs in a day.
$0.05 to $0.11/M
550 M-20.55 B RPUs
The next 20 billion RPUs in a day.
$0.01 to $0.03/M
20.55+ B RPUs
All subsequent RPUs in a day.
Free

Example

If your application uses 560 million RPUs in a day, in a region with prices of $0.10/M, $0.06/M, and $0.02/M by tier, Atlas charges you $35.20:

  • $0.10/M for the first 50 million ($5.00).

  • $0.06/M for the next 500 million ($30.00).

  • $0.02/M for the last 10 million ($0.20).

If that usage is typical for a day, your application costs approximately $1056 per month ($35.20 per day x 30 days).

In another example, if your application uses 0.5 million RPUs in a day in the same region, Atlas charges you $0.05:

  • $0.10/M for the first 0.5 million ($0.05).

If that usage is typical for a day, your application costs approximately $1.50 per month ($0.05 per day x 30 days).

Warning

An unexpected, significant increase in serverless instance usage could result in an expensive invoice. Use billing alerts to monitor usage.

You can pay for serverless instances with:

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