Gocoin node shows it on its web interface.
In the "Blocks" tab, the SPB column shows the average tx fees within each block.
For more detailed data, you need to click the chart icon next to the block you want to see:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2Ff6knkOd.png&t=670&c=pc0sUweSoOhPRw)
Then you get to see a chart like this:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FfJeTXy0.png&t=670&c=BZtB92sP5Nc8JA)
For that you should rather use the "Transactions" tab, as it shows the current state fo the mempool:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FZ5Sy5cQ.png&t=670&c=jEsyf5q7SyoLBQ)
With the chart like above, you'd probably want to go slightly above 500 SPB.