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Merge pull request #4560 from mempool/mononaut/fee-sanity

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Additional fee recommendation sanity checks
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softsimon 2024-01-09 10:41:52 +07:00 committed by GitHub
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1 changed files with 14 additions and 4 deletions
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backend/src/api/fee-api.ts
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@ -39,15 +39,25 @@ class FeeApi {
const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], pBlocks[2], firstMedianFee) : this.defaultFee;
const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], pBlocks[3], secondMedianFee) : this.defaultFee;
let fastestFee = Math.max(minimumFee, firstMedianFee);
let halfHourFee = Math.max(minimumFee, secondMedianFee);
let hourFee = Math.max(minimumFee, thirdMedianFee);
const economyFee = Math.max(minimumFee, Math.min(2 * minimumFee, thirdMedianFee));
// ensure recommendations always increase w/ priority
fastestFee = Math.max(fastestFee, halfHourFee, hourFee, economyFee);
halfHourFee = Math.max(halfHourFee, hourFee, economyFee);
hourFee = Math.max(hourFee, economyFee);
// explicitly enforce a minimum of ceil(mempoolminfee) on all recommendations.
// simply rounding up recommended rates is insufficient, as the purging rate
// can exceed the median rate of projected blocks in some extreme scenarios
// (see https://bitcoin.stackexchange.com/a/120024)
return {
'fastestFee': Math.max(minimumFee, firstMedianFee),
'halfHourFee': Math.max(minimumFee, secondMedianFee),
'hourFee': Math.max(minimumFee, thirdMedianFee),
'economyFee': Math.max(minimumFee, Math.min(2 * minimumFee, thirdMedianFee)),
'fastestFee': fastestFee,
'halfHourFee': halfHourFee,
'hourFee': hourFee,
'economyFee': economyFee,
'minimumFee': minimumFee,
};
}