ECPTextStream VS crypto_vba

The table below shows the overall performance for the read operations, you can download the test files from here. The test machine is running Win 10 Pro 64-bit, Intel® Core™ i7-4500U CPU N2600 @1.80 GHz - 2.40 GHz, 8 GB RAM.

This is a perfect use case for ECPTextStream. Create a loop for read the source text file and write the result file. Inside the file loop, manage to handle the last chunk of information and remove the last char until a line break is found.

Maybe the ECPTextStream class module can help you. This library is faster than the scripting method when dealing with text files and can manage files up to 2GB without any problem. See the benchmarks here.

Parse CSV/TSV through streams with the ECPTextStream class module.

New versión of the VBA-CSV Interface class. This will integrate the ECPTextStream class module in order to reduce memory overloads when retrieving few records from a CSV file.

It basically uses the Dictionary object to create variables (e.g. with a dictionary in a dictionary) and after that using that library to transform it into a string. I'm using it in my project here: https://github.com/krijnsent/crypto_vba/blob/master/ModExchKucoin.bas

I agree with u/sslinky84 that there is no safe place in VBA. The main question is: what's the purpose of an API key in this case? From your description you are not linking an API-key to a single user, but have "one key to rule them all". So you probably want to prevent someone from grabbing your end-point and spamming it? In that case you're perfectly fine in creating one API-string in VBA and checking that on the server: it blocks the person who is opening a browser to fiddle with your end-point, but it does give you some security. The people who can get through are the ones that manage to crack open your VBA (assuming you have a password on the VBA). To make their life a bit harder you could instead of a "fixed string" as API key go for some kind of hash, as u/archn suggests. E.g.: take the rest of the post message that e.g. also includes a mandatory timestamp, make a simple hash of that (might even include a "fixed key", see e.g. https://github.com/krijnsent/crypto_vba/blob/master/ModHash.bas for some code).

I've built an open source VBA-Excel library to communicate with cryptocurrency exchanges ( https://github.com/krijnsent/crypto_vba ) and have my code available as .bas and in an .xlsm file. A couple of days ago someone posted an issue that my xlsm file triggered a Windows defender alert. At my pc this doesn't happen, the AVG virus scanner also won't show anything.

I am mainly using Cryptocompare, but if you want to use CoinGecko, check out my code, it has the basics: https://github.com/krijnsent/crypto_vba/ It has most of the essentials: connecting Excel to web, handling Json and some API examples.