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Hi there,

I didn't get the point of without capacity

Each transaction should pay CKB oftx_weight * fee_rate for miner to be packged into a block. That's usually called transaction fee.

But the transaction fee of a transaction can be paid by anyone involved in the transaction, say, Alice wants to make a transfer to Bob, but Alice doesn't like to pay the fee, Carol can join in the transaction by adding his/her input cell in the transaction for the fee.

A typical usage is known as open transaction(https://github.com/nervosnetwork/ckb/discussions/3607)

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