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fees: add MemPoolFeeRateEstimator class

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Add MemPoolFeeRateEstimator, which calls Bitcoin Core's block
assembler with the mempool and chainstate to build a block template and
use its chunk fee rates for fee rate estimation.

Add CalculateMaxWeightPercentiles to return the 50th and 75th
percentile chunk feerates by cumulative block weight. If sparse,
EstimateFeeRate uses the higher of the minimum relay fee rate and the
current mempool minimum fee rate.

The 50th percentile is returned as the conservative estimate, and the
75th percentile as the economical estimate.

Wire MemPoolFeeRateEstimator into FeeRateEstimatorManager and add
FeeRateEstimatorType::MEMPOOL_POLICY for result attribution.

Add unit tests for the mempool fee rate estimator and fee estimator
string conversions, plus fuzz coverage for the string conversions.

Co-authored-by: willcl-ark <will@256k1.dev>
This commit is contained in:
ismaelsadeeq
2026-02-03 13:30:22 +00:00
parent 9cacf677a9
commit c9bb3df29f
15 changed files with 362 additions and 23 deletions
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test/functional/rpc_estimatefee.py
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@@ -50,6 +50,7 @@ class EstimateFeeTest(BitcoinTestFramework):
self.nodes[0].estimatesmartfee(1, 'unset')
self.nodes[0].estimatesmartfee(1, 'conservative')
self.nodes[0].estimatesmartfee(1, 'ECONOMICAL', {"fee_rate_estimator": "block_policy"})
self.nodes[0].estimatesmartfee(1, 'ECONOMICAL', {"fee_rate_estimator": "mempool_policy"})
self.nodes[0].estimatesmartfee(1, 'ECONOMICAL', {"fee_rate_estimator": "foo"})
self.nodes[0].estimaterawfee(1)