Lambda Store has a free tier with some limitations. A user can create only one free database. Check the table on Database Types chapter for more about the limitations.
You do not need to enter your credit card to use a free database. And you can upgrade your free tier database to standard one without losing any data. But to upgrade you need to have a payment method.
Lambda Store's default pricing model is serverless. You pay for the amount of request, you send to the database. Because the persistence is enabled by default, the storage also costs.
100.000 requests cost 0.4 USD.
Request cost of a Database = Total request count / 100.000 X $0.4
Storage cost of Database (monthly) = Average Data Size (in GB) X $0.15
Total Cost = Request Cost + Storage Cost
Even if you do not access your data, we have to keep it persistent in Cloud Provider's persistence storage (eg AWS EBS, S3) for durability. We take daily average of your data size and multiply with 0.15 at the end of the month. If you have 1 GB data in your database through the all month, you pay $0.15 monthly. If your database is empty in the first 29 days of the month and it expands to 30GB on the last day of the month; then still you pay $0.15 for that month (30GB / 30day X 0.15).
If you are using your database as a cache; then it is a good practice to set a timeout (EXPIRE) for your keys to minimize the cost.
If your application requires steady and high throughput, then it makes sense to buy a reserved plan instead of serverless pricing. You can buy different plans according to your memory and throughput needs. Reserved databases are charged monthly. The payment is upfront so if you buy a reserved database, even if you delete it, your payment for the current month is not refunded. The next month, you will not be charged because you deleted the reserved database.
Here the plans:
|Plan Name||Max Throughput||Max Data Size||Price (Standard)||Price (Premium)|
|Reserved 500||500 ops/sec||10GB||$80 /month||$120 /month|
|Reserved 1K||1K ops/sec||20GB||$140 /month||$220 /month|
|Reserved 10K||10K ops/sec||50GB||$350 /month||$550 /month|
|Reserved 100K||100K ops/sec||100GB||$1400 /month||$1900 /month|
|Reserved 500K||500K ops/sec||500GB||$4900 /month||$6200 /month|
Different than serverless pricing, reserved prices exclude network and storage costs, which will be charged monthly, reflecting the cloud provider's charge.
The reserved pricing is not available in the current console UI yet. Still you can buy a reserved plan by contacting us email@example.com