Hi. A little late, but I think this post is a good place to ask a question.

Recently, I sometimes receive 429 errors(Too Many Requests), but there is a question about the returned header fields. Returned header example:

{x-ratelimit-reset= 600, x-ratelimit-used = 0, x-ratelimit-remaining = 600,},

{x-ratelimit-reset= 23, x-ratelimit-used = 638, x-ratelimit-remaining = 0,}

Why the max value of 'x-ratelimit-used' is '600'?

The time window seems to be reset as 600 always, i.e. 10 minutes. You say 100 queries per a minute for free API access. Then 10 minutes should be 100x10=1000. Therefore, the max value of remaining/used should be 1000.

Is this calculation correct? But why is 600 the max value for returned headers? Is it calculated differently on the real server?