[#kernel-MemPoolOptions]
= xref:kernel.adoc[kernel]::MemPoolOptions
:relfileprefix: ../
:mrdocs:

Tunable options controlling memory‐pool acceptance and limits.

== Synopsis

Declared in `<kernel/mempool_options.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct MemPoolOptions;
----

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:kernel/MemPoolOptions/check_ratio.adoc[`check_ratio`] 
| The ratio used to determine how often sanity checks will run.
| xref:kernel/MemPoolOptions/dust_relay_feerate.adoc[`dust_relay_feerate`] 
| Fee rate below which an output is considered dust.
| xref:kernel/MemPoolOptions/expiry.adoc[`expiry`] 
| How long a transaction may stay in the mempool before it expires.
| xref:kernel/MemPoolOptions/incremental_relay_feerate.adoc[`incremental_relay_feerate`] 
| Minimum fee rate increment for replace‐by‐fee and relay.
| xref:kernel/MemPoolOptions/limits.adoc[`limits`] 
| Ancestor and descendant count and size limits for the mempool.
| xref:kernel/MemPoolOptions/max_datacarrier_bytes.adoc[`max_datacarrier_bytes`] 
| A data carrying output is an unspendable output containing data. The script type is designated as TxoutType::NULL_DATA.
| xref:kernel/MemPoolOptions/max_size_bytes.adoc[`max_size_bytes`] 
| Maximum mempool memory usage, in bytes.
| xref:kernel/MemPoolOptions/min_relay_feerate.adoc[`min_relay_feerate`] 
| A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation)
| xref:kernel/MemPoolOptions/permit_bare_multisig.adoc[`permit_bare_multisig`] 
| Whether bare multisig outputs are relayed as standard.
| xref:kernel/MemPoolOptions/persist_v1_dat.adoc[`persist_v1_dat`] 
| Whether to write mempool.dat using the legacy V1 serialization.
| xref:kernel/MemPoolOptions/require_standard.adoc[`require_standard`] 
| Whether to enforce standardness rules on accepted transactions.
| xref:kernel/MemPoolOptions/signals.adoc[`signals`] 
| Sink for validation event notifications, or null if unused.
|===



[.small]#Created with https://www.mrdocs.com[MrDocs]#