July 10, 2026

Why are zero fee transactions not being included in blocks that are not full?

Why are zero fee transactions not being included in blocks that are not full?

Today, I sent a Bitcoin payment but it has not been included in a block for about 10 hours now. The payment had the following characteristics:

  • ~0.1 BTC
  • 222 bytes
  • One UTXO as an input (I used coin control)
  • The UTXO was approximately 1 year old

Currently, blocks are not always full (in fact there are blocks that are only 8% full). For that reason I attempted to save the fee.

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(https://bitcoinfees.github.io/#1m)

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(https://blockchain.info/ 2016-08-08 20:42 UTC).

What policy do miners currently have regarding zero fee transactions? I have sent many zero fee transactions in the past (>1 year ago) and the block inclusion time was really quick (~5 blocks maybe). Did the policy of miners change?

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