Need some custom code changes to the phpBB core simple enough that you feel doesn't require an extension? Then post your request here so that community members can provide some assistance.
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Depends on what do you want to fetch from that crypt coin api. Not much info provided. But as you stated, you can start learning to code & do it for developing/learning or just for fun.
Usus est magister optimus! phpBB pre-Triton & latest php environment.
When answer lies in the question, question becomes redundant!
"The good news is hell is just the product of a morbid human imagination.
The bad news is, whatever humans can imagine, they can usually create." - Harmony Cobel