use precise fee rates estimate from mempool.space
What the developer wrote
Authored by Craig Raw
use precise fee rates estimate from mempool.space
What changed, and why it matters
This commit changes the Bitcoin fee-rate data source used by Sparrow Wallet from mempool.space's standard recommended-fee endpoint to its more precise fee-estimate endpoint. It is a minor data-source change, not a code-level security fix. There is no indication in the commit that this resolves a security vulnerability.
No security action required. Treat as a normal functional/data-quality update. If desired, verify that the /v1/fees/precise endpoint returns data in the same JSON schema as /v1/fees/recommended so that getThreeTierFeeRates() continues to parse it correctly.
Security signals we found
No security-related keywords in commit title or message
No change to authentication, cryptography, input validation, or network trust model
Endpoint change to a different API path on the same third-party service (mempool.space)
No CVE, advisory, or researcher attribution present in commit materials
Evidence from the diff
The single-line change updates FeeRatesSource.java for the MEMPOOL_SPACE enum so that getBlockTargetFeeRates() calls mempool.space’s /v1/fees/precise endpoint instead of /v1/fees/recommended. The rest of the parsing logic (getThreeTierFeeRates) remains unchanged. The commit message only mentions fee-rate precision, not security.
Changed components
src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.javaMEMPOOL_SPACE fee-rate sourceInspect captured patch +1 / −1
diff --git a/src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java b/src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java
index 9a3b7ee..275bc86 100644
--- a/src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java
+++ b/src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java
@@ -31,7 +31,7 @@ public enum FeeRatesSource {
MEMPOOL_SPACE("mempool.space", true) {
@Override
public Map<Integer, Double> getBlockTargetFeeRates(Map<Integer, Double> defaultblockTargetFeeRates) {
- String url = getApiUrl() + "v1/fees/recommended";
+ String url = getApiUrl() + "v1/fees/precise";
return getThreeTierFeeRates(this, defaultblockTargetFeeRates, url);
}
Why this scored 21/100
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