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There is no minimum amount. You can lease at a cost of as little as 1 steem.

You must make sure the interest rate you offer is high enough. Unless the “Nett APR” is at least 40 you have only a low chance of someone taking your offer.

Of course you must have enough steem in your account to pay for the lease. In your case @zizymena, you have zero steem so you can’t pay for it. You will have to earn some more, or buy some steem first.

Yeah I wasn't having in my account, we actually had a kind of joint contributions I and fellow minnows to come up with that amount in a new account so we can curate our posts. When the lease didn't come through it was converted back to SBD and re distributed to everyone who contributed. Thanks @swissclive for the interest rate tip. Will sure put that into consideration next time.