What fee rates mean
Bitcoin transaction fees are priced per unit of data, not per transaction or per coin moved. The standard unit is satoshis per virtual byte (sat/vB) — the virtual byte accounts for SegWit's discounted witness data, so it is slightly smaller than raw byte size for most modern transactions. A transaction's total fee is its virtual size multiplied by the fee rate it pays. Miners fill each block by picking the highest sat/vB transactions first, so a higher rate means faster confirmation, all else equal.
The four tiers above
- Next block — the rate estimated to get a transaction into the very next block (roughly 10 minutes on average, though block times vary).
- 30 min — targets confirmation within approximately 3 blocks.
- 1 hour — targets confirmation within approximately 6 blocks.
- Economy— the lowest rate expected to confirm eventually without being evicted from most nodes' mempools; can take significantly longer during busy periods.
How fee estimation works
Fee estimators look at the current backlog in the mempool — how many vMB of transactions are already queued at or above a given fee rate — and project how many blocks it would take to clear that backlog assuming typical block capacity. See the live queue on the Bitcoin Mempool page. This is a statistical estimate, not a guarantee — actual confirmation depends on which transactions miners include and how quickly the next blocks are found.
What drives fee changes
Fees rise when transaction demand outpaces the roughly 1–4 vMB of space available per block — typically during high market volatility, NFT/inscription activity, or exchange-driven on-chain flurries. Fees fall when the mempool is thin and blocks have spare capacity. A run of unusually fast blocks (found sooner than the 10-minute average) also temporarily eases pressure by clearing the backlog faster than expected. This fee signal, combined with large mempool transactions, feeds directly into Mempool Heat, bitcoinnews.io's live network activity score.
How to save on fees
- If a transaction is not time-sensitive, use the economy rate and accept a longer wait — most wallets support this as a selectable option.
- Batch multiple payments into a single transaction where possible; this spreads the fixed overhead of transaction inputs/outputs across more value moved.
- Use a SegWit or Taproot-compatible wallet address format — these reduce virtual size compared to legacy addresses, lowering the fee for the same fee rate.
- Time transactions for periods of lower network demand where practical, though fee markets can move quickly and unpredictably.
Data source and update frequency
Fee rates are sourced from the mempool.space /api/v1/fees/recommended endpoint. bitcoinnews.io polls this endpoint on the server approximately every 8 seconds, and the figures above update live via the dashboard's data feed.