[#MemPoolFeeRateEstimatorCache-GetCachedEstimate]
= xref:MemPoolFeeRateEstimatorCache.adoc[MemPoolFeeRateEstimatorCache]::GetCachedEstimate
:relfileprefix: ../
:mrdocs:

Returns cached estimates if not stale and computed on tip_hash, nullopt otherwise.

== Synopsis

Declared in `<policy/fees/mempool_estimator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<FeeRateEstimate>
GetCachedEstimate(xref:uint256.adoc[uint256] const& tip_hash) const;
----

== Return Value

The cached estimate when fresh and computed on tip_hash, otherwise nullopt.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *tip_hash*
| Hash of the chain tip the caller expects the estimate to match.
|===


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