diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index ba85809416be..8a67c6915b1d 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -74,6 +74,11 @@ class MnEntry
 
     virtual bool isBanned() const = 0;
     virtual CService getNetInfoPrimary() const = 0;
+    //! Platform HTTPS (DAPI gateway) endpoints from the extended address
+    //! list; empty for non-evo masternodes. Domain-based entries are
+    //! skipped rather than resolved here — the first entry is always a
+    //! CService, so an evonode never contributes an empty set.
+    virtual std::vector<CService> getPlatformHTTPSAddrs() const = 0;
     virtual MnType getType() const = 0;
     virtual UniValue toJson() const = 0;
     virtual const CKeyID& getKeyIdOwner() const = 0;
@@ -213,6 +218,19 @@ class LLMQ
         int32_t m_expiry_height{0};
     };
     virtual std::vector<QuorumInfo> getQuorumStats() = 0;
+    struct PlatformQuorum {
+        uint256 m_quorum_hash{};
+        std::vector<uint8_t> m_pubkey{}; //!< serialized BLS public key (basic scheme)
+        int32_t m_height{0};
+    };
+    //! Locally retained quorums of the given LLMQ type with their public
+    //! keys. Used by the GUI Platform client to verify Platform state-root
+    //! quorum signatures against locally synced quorum data. This includes
+    //! retained signing quorums that are no longer in the active signing set.
+    virtual std::vector<PlatformQuorum> getPlatformQuorums(uint8_t llmq_type) = 0;
+    //! Serialized InstantSend lock for the given txid, or empty if the
+    //! transaction has no islock (used to build asset lock proofs).
+    virtual std::vector<uint8_t> getInstantSendLock(const uint256& txid) = 0;
     virtual void setContext(node::NodeContext* context) {}
 };
 
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 80dd1e018d46..1c02779e93e1 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -28,6 +28,7 @@
 #include <interfaces/handler.h>
 #include <interfaces/wallet.h>
 #include <instantsend/instantsend.h>
+#include <llmq/blockprocessor.h>
 #include <llmq/commitment.h>
 #include <llmq/context.h>
 #include <llmq/options.h>
@@ -134,6 +135,27 @@ class MnEntryImpl : public MnEntry
     bool isBanned() const override { return m_dmn->pdmnState->IsBanned(); }
 
     CService getNetInfoPrimary() const override { return m_dmn->pdmnState->netInfo->GetPrimary(); }
+    std::vector<CService> getPlatformHTTPSAddrs() const override
+    {
+        std::vector<CService> ret;
+        if (m_dmn->pdmnState->nVersion < ProTxVersion::ExtAddr) {
+            // Before ExtAddr the Platform ports are scalar fields paired with
+            // the primary address instead of netInfo entries, so an evonode
+            // that has not submitted an extended-address update would
+            // otherwise contribute no gateway at all.
+            if (m_dmn->nType == MnType::Evo && m_dmn->pdmnState->platformHTTPPort != 0) {
+                ret.emplace_back(m_dmn->pdmnState->netInfo->GetPrimary(),
+                                 m_dmn->pdmnState->platformHTTPPort);
+            }
+            return ret;
+        }
+        for (const auto& entry : m_dmn->pdmnState->netInfo->GetEntries(NetInfoPurpose::PLATFORM_HTTPS)) {
+            if (const auto service_opt{entry.GetAddrPort()}) {
+                ret.push_back(*service_opt);
+            }
+        }
+        return ret;
+    }
     MnType getType() const override { return m_dmn->nType; }
     UniValue toJson() const override { return m_dmn->ToJson(); }
     const CKeyID& getKeyIdOwner() const override { return m_dmn->pdmnState->keyIDOwner; }
@@ -539,6 +561,58 @@ class LLMQImpl : public LLMQ
         }
         return stats;
     }
+    std::vector<PlatformQuorum> getPlatformQuorums(uint8_t llmq_type) override
+    {
+        std::vector<PlatformQuorum> ret;
+        if (!context().llmq_ctx || !context().llmq_ctx->quorum_block_processor || !context().chainman) {
+            return ret;
+        }
+        const auto* pindex{WITH_LOCK(::cs_main, return context().chainman->ActiveChain().Tip())};
+        if (!pindex) {
+            return ret;
+        }
+        const auto type{static_cast<Consensus::LLMQType>(llmq_type)};
+        const auto llmq_params{Params().GetLLMQ(type)};
+        if (!llmq_params.has_value()) {
+            return ret;
+        }
+        // Drive proofs may be signed by an older Platform quorum while they
+        // are still consensus-valid and retained locally. Export the full
+        // retained-key window, not only the current signing-active set.
+        const auto quorum_count{static_cast<size_t>(std::max(llmq_params->signingActiveQuorumCount,
+                                                             llmq_params->keepOldKeys))};
+        // Read mined final commitments directly: they already carry the quorum
+        // hash and public key, so there is no need to materialize full CQuorum
+        // objects (member lists, vvec/contribution reads, quorum cache inserts)
+        // via ScanQuorums. Newest-first, matching ScanQuorums' ordering.
+        const auto& qbp{*context().llmq_ctx->quorum_block_processor};
+        const auto quorum_base_block_indexes{llmq_params->useRotation
+            ? qbp.GetMinedCommitmentsIndexedUntilBlock(type, pindex, quorum_count)
+            : qbp.GetMinedCommitmentsUntilBlock(type, pindex, quorum_count)};
+        for (const auto* pQuorumBaseBlockIndex : quorum_base_block_indexes) {
+            const auto qc{qbp.GetMinedCommitment(type, pQuorumBaseBlockIndex->GetBlockHash()).first};
+            if (!qc.quorumPublicKey.IsValid()) continue;
+            ret.emplace_back(PlatformQuorum{
+                .m_quorum_hash = qc.quorumHash,
+                .m_pubkey = qc.quorumPublicKey.ToByteVector(/*specificLegacyScheme=*/false),
+                .m_height = pQuorumBaseBlockIndex->nHeight,
+            });
+        }
+        return ret;
+    }
+    std::vector<uint8_t> getInstantSendLock(const uint256& txid) override
+    {
+        if (!context().llmq_ctx || !context().llmq_ctx->isman) {
+            return {};
+        }
+        const auto islock{context().llmq_ctx->isman->GetInstantSendLockByTxid(txid)};
+        if (!islock) {
+            return {};
+        }
+        CDataStream ds(SER_NETWORK, PROTOCOL_VERSION);
+        ds << *islock;
+        return {UCharCast(ds.data()), UCharCast(ds.data()) + ds.size()};
+    }
     void setContext(NodeContext* context) override
     {
         m_context = context;