Kucoin API is Broken / Unavailable?

Question

I'm wondering if anyone else has been able to use the kucoin api. I have been trying to call it from Postman, but the docs are extremely confusing. I am trying to call for lending rates data, and I was thinking that should be at this endpoint:

https://api.kucoin.com/api/v1/margin/lend

This seems to be the correct endpoint, but I can't figure out what the correct headers are to pass in- it's pretty weird that kucoin requires FOUR headers where some are encoded, some are not... Anyway, this is what I'm using:

KC-API-KEY: the key from kucoin browser when making a new api key

KC-API-PASSPHRASE: the passphrase from kucoin browser when making a new api key

KC-API-TIMESTAMP: the current number of seconds since epoch

KC-API-SIGN: the secret from kucoin browser when making a new api key

I have made 4 keys now and am 100% sure I'm using the correct passphrase and secret, but every time I get an error response that it doesn't like either KC-API-SIGN or KC-API-PASSPHRASE...

I have tried sha encoding and base64-ing each of these, but nothing has worked for me so far... Has anyone had any success with kucoin api? what am I doing wrong here??

Thanks!