4 files changed, 20 insertions, 4 deletions
diff --git a/src/init.cpp b/src/init.cpp
index a94bbe6460..9a3c70abbd 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1418,7 +1418,9 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         .estimator = node.fee_estimator.get(),
         .check_ratio = chainparams.DefaultConsistencyChecks() ? 1 : 0,
     };
-    ApplyArgsManOptions(args, mempool_opts);
+    if (const auto err{ApplyArgsManOptions(args, chainparams, mempool_opts)}) {
+        return InitError(*err);
+    }
     mempool_opts.check_ratio = std::clamp<int>(mempool_opts.check_ratio, 0, 1'000'000);
 
     int64_t descendant_limit_bytes = mempool_opts.limits.descendant_size_vbytes * 40;
diff --git a/src/mempool_args.cpp b/src/mempool_args.cpp
index 77caa127e9..da0fb62262 100644
--- a/src/mempool_args.cpp
+++ b/src/mempool_args.cpp
@@ -7,7 +7,13 @@
 #include <kernel/mempool_limits.h>
 #include <kernel/mempool_options.h>
 
+#include <chainparams.h>
+#include <tinyformat.h>
 #include <util/system.h>
+#include <util/translation.h>
+
+#include <chrono>
+#include <memory>
 
 using kernel::MemPoolLimits;
 using kernel::MemPoolOptions;
@@ -25,7 +31,7 @@ void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolLimits& mempool_limi
 }
 }
 
-void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolOptions& mempool_opts)
+std::optional<bilingual_str> ApplyArgsManOptions(const ArgsManager& argsman, const CChainParams& chainparams, MemPoolOptions& mempool_opts)
 {
     mempool_opts.check_ratio = argsman.GetIntArg("-checkmempool", mempool_opts.check_ratio);
 
@@ -36,4 +42,6 @@ void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolOptions& mempool_opt
     mempool_opts.full_rbf = argsman.GetBoolArg("-mempoolfullrbf", mempool_opts.full_rbf);
 
     ApplyArgsManOptions(argsman, mempool_opts.limits);
+
+    return std::nullopt;
 }
diff --git a/src/mempool_args.h b/src/mempool_args.h
index 9a4abe6618..72d202cca2 100644
--- a/src/mempool_args.h
+++ b/src/mempool_args.h
@@ -5,18 +5,23 @@
 #ifndef BITCOIN_MEMPOOL_ARGS_H
 #define BITCOIN_MEMPOOL_ARGS_H
 
+#include <optional>
+
 class ArgsManager;
+class CChainParams;
+struct bilingual_str;
 namespace kernel {
 struct MemPoolOptions;
 };
 
 /**
  * Overlay the options set in \p argsman on top of corresponding members in \p mempool_opts.
+ * Returns an error if one was encountered.
  *
  * @param[in]  argsman The ArgsManager in which to check set options.
  * @param[in,out] mempool_opts The MemPoolOptions to modify according to \p argsman.
  */
-void ApplyArgsManOptions(const ArgsManager& argsman, kernel::MemPoolOptions& mempool_opts);
+[[nodiscard]] std::optional<bilingual_str> ApplyArgsManOptions(const ArgsManager& argsman, const CChainParams& chainparams, kernel::MemPoolOptions& mempool_opts);
 
 
 #endif // BITCOIN_MEMPOOL_ARGS_H
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 67984721a3..f5076c043b 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -160,7 +160,8 @@ CTxMemPool::Options MemPoolOptionsForTest(const NodeContext& node)
         // chainparams.DefaultConsistencyChecks for tests
         .check_ratio = 1,
     };
-    ApplyArgsManOptions(*node.args, mempool_opts);
+    const auto err{ApplyArgsManOptions(*node.args, ::Params(), mempool_opts)};
+    Assert(!err);
     return mempool_opts;
 }