***Ongoing costs for the running of high performance, scalable, and reliable public infrastructure for Kusama and Statemine.***

Over the last 3 months (October, November, December 2021) we've provided a scalable free public API service so that everyone can access public pools of managed Kusama and Statemine nodes.

Between 2021-10-01 and 2021-12-31 our Kusama API service has:
- Served a total of 9,333,324,393 (9 billion) responses (an increase of 16% on the previous quarter)
- Accumulated over 60 TB of data egress (up 7% on Q2)
- The highest daily total was 394,214,930 responses in a single 24 hour period
- Our rolling 7 day average at the end of this period was over 44 million responses each day.
- Statemine had over 314 million API responses in the period
- All time totals for Kusama is 20,233,883,203 (20 Billion) since November

![Q4 data](https://docs.google.com/spreadsheets/d/e/2PACX-1vSWsNDzGIGX16MM4vjqaDe_w8JWVoSa-Fl6A71mn-WlKkYumG07PBA2q5KJcSSrQavHUcnEUdGhJpkf/pubchart?oid=1902245037&format=image)

In early October we experienced a surge of activity that took us to our highest daily response count of almost 400 million responses in a single day.

During this period we also noticed additional load on the compute component of our resourcing that we believe is due to over 20 different parachains connecting to the main relay chain and the additional block verification that resulted. We scaled up the compute component of our infrastructure to maintain service levels as a result. Additionally we are closely watching the work that Dwellir is doing in the ecosystem to propose improvements to the RPC nodes.

Additionally, our experience shows significant performance improvements in terms of response times when the CPU usage is less than 50%. We observed a noticeable drop of service quality (in terms of response times) when the node is under load.

This proposal includes combined running costs for our infrastructure for Kusama and Statemine. The total combined running cost is USD $45,949.51

[The full writeup is here](https://docs.google.com/document/d/1mzROC1pcn6h6awsxdQ0LB1nOLWzUMNZjK8L2kL_3p_A/edit?usp=sharing)

- They have been providing a free public API service for Kusama and Statemine.
- They have served billions of responses and accumulated a lot of data.
- They experienced a surge of activity and had to scale up their infrastructure.
- They noticed that response times are better when the CPU usage is less than 50%.
- The total cost for running their infrastructure is $45,949.51.

#131 OnFinality - High Performance Public Infrastructure (Q4 2021)

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