Following the example from: https://infura.io/docs/ipfs/post/add
I tried adding a file using the API https://ipfs.infura.io:5001/api/v0/add?pin=false
I see it does not require an API key.
Are you hosting the file for free? forever? is it 100% reliable?
Are there any rate limits for adding content?
Otherwise, what is the price of the service and how to insert the API key in the POST query?