From 7cdaa24e63e72991363b0cb77a4d06a9b0b95338 Mon Sep 17 00:00:00 2001
From: tequ <git@tequ.dev>
Date: Fri, 30 Jan 2026 20:27:46 +0900
Subject: [PATCH] Fixed the minimum amount for creating a Sponsored Account.

---
 src/test/app/Sponsor_test.cpp       | 32 +++++++++++++----------------
 src/xrpld/app/tx/detail/Payment.cpp |  5 +++++
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/src/test/app/Sponsor_test.cpp b/src/test/app/Sponsor_test.cpp
index 8ba30372ce..5e1bbea2dc 100644
--- a/src/test/app/Sponsor_test.cpp
+++ b/src/test/app/Sponsor_test.cpp
@@ -1155,7 +1155,6 @@ public:
     {
         testcase("Sponsor Account");
         using namespace test::jtx;
-        Env env{*this, testable_amendments() - featureSponsor};
 
         Account const alice("alice");
         Account const sponsor("sponsor");
@@ -1163,13 +1162,18 @@ public:
         Account const charlie("charlie");
         Account const gw("gw");
         auto const USD = gw["USD"];
+
+        {
+            // Disabled
+            Env env{*this, testable_amendments() - featureSponsor};
+            env.fund(XRP(10000), alice, sponsor);
+            env.close();
+            env(pay(alice, bob, XRP(100)), txflags(tfSponsorCreatedAccount), ter(temDISABLED));
+            env.close();
+        }
+
+        Env env{*this, testable_amendments()};
         env.fund(XRP(10000), alice, sponsor);
-
-        // Disabled
-        env(pay(alice, bob, XRP(100)), txflags(tfSponsorCreatedAccount), ter(temDISABLED));
-        env.close();
-
-        env.enableFeature(featureSponsor);
         env.close();
 
         // Invalid flags
@@ -1187,12 +1191,6 @@ public:
         env(pay(alice, bob, USD(100)), txflags(tfSponsorCreatedAccount), ter(temBAD_AMOUNT));
         env.close();
 
-        // Insufficient reserve
-        env(pay(alice, bob, (env.current()->fees().accountReserve(0) - drops(1))),
-            txflags(tfSponsorCreatedAccount),
-            ter(tecNO_DST_INSUF_XRP));
-        env.close();
-
         // Account is not sponsored by normal Sponsor specification
         {
             env(pay(alice, bob, drops(env.current()->fees().accountReserve(0))),
@@ -1209,13 +1207,11 @@ public:
         // Use tfSponsorCreatedAccount to sponsor an account
         {
             // to funded account
-            env(pay(sponsor, bob, drops(env.current()->fees().accountReserve(0))),
-                txflags(tfSponsorCreatedAccount),
-                ter(tecNO_SPONSOR_PERMISSION));
+            env(pay(sponsor, bob, drops(1)), txflags(tfSponsorCreatedAccount), ter(tecNO_SPONSOR_PERMISSION));
+            env.close();
 
             // to non-funded account
-            env(pay(sponsor, charlie, drops(env.current()->fees().accountReserve(0))),
-                txflags(tfSponsorCreatedAccount));
+            env(pay(sponsor, charlie, drops(1)), txflags(tfSponsorCreatedAccount));
             env.close();
 
             auto const charlieSle = env.le(keylet::account(charlie));
diff --git a/src/xrpld/app/tx/detail/Payment.cpp b/src/xrpld/app/tx/detail/Payment.cpp
index e57415ac43..9980cc3d1e 100644
--- a/src/xrpld/app/tx/detail/Payment.cpp
+++ b/src/xrpld/app/tx/detail/Payment.cpp
@@ -299,6 +299,11 @@ Payment::preclaim(PreclaimContext const& ctx)
             // transaction would succeed.
             return telNO_DST_PARTIAL;
         }
+        else if (txFlags & tfSponsorCreatedAccount)
+        {
+            // The minimum amount when creating a Sponsored Account is 1 drop.
+            // Since the reserve is covered by the sponsor, you don't need to hold the 1-increment reserve yourself.
+        }
         else if (dstAmount < STAmount(ctx.view.fees().reserve))
         {
             // accountReserve is the minimum amount that an account can have.