I'm currently going through Blockfrost documentation and trying to figure out if there is a way to fetch block load for each day.

Seems like they don't have such option, in that case: Is there a way to calculate block load?

2 Answers 2


No Blockfrost endpoint retrieves this information.

As per this tweet, the current size of blocks is 88KB.

So, you can calculate the % of block load for each block this way:

( cardano_node_metrics_blockfetchclient_blocksize / (88 * 1024) ) * 100

cardano_node_metrics_blockfetchclient_blocksize is a metric exposed by Prometheus in the cardano-node. You can query it using Grafana. Unfortunately, you will need to run your own node for this.

This is a very useful link on how to setup the Grafana Dashboard: https://developers.cardano.org/docs/stake-pool-course/handbook/grafana-dashboard-tutorial/

  • Thank you! However, there is no APIs that will not require to run node? I assume I just need to fetch size of the block and then make calculations myself
    – Fill
    Jun 1, 2022 at 7:25
  • 1
    The problem is that, in order to fetch the size of the block (cardano_node_metrics_blockfetchclient_blocksize), you need to use Grafana. And Grafana is a tool made to monitor your own node: you can't plug it to an API. Jun 1, 2022 at 10:16

Since you're looking for a way without running a node, example using Koios (am sure blockfrost offers similar endpoints too):

  1. Max size of block from current protocol can be found using epoch_params

  2. I am not sure if I fully understand the term block load , but I assume you mean average size of blocks for a specific time range. You can get a filtered list of size and time using blocks endpoint, the list is - ofcourse - paginated, which you can find an average of. Sample: here

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