Is there a Brainfuck API?

Question

So I stumbled upon a Brainfuck question, and I wondered, do any of its compilers/interpreters provide an API?

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I'll make a separate question about accessing other APIs.

Answer 1

In pure Brainfuck, there won't be anything, unless you write your own interpreter that uses specific chunks of memory for this.

One project that may interest you is ajyoon/systemf, an interpreter where you can make Linux system calls using a special ninth character.

EDIT: I ended up answering the wrong question of the asker, this is more an answer to the other one.