diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b609f1..9ef6cf1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -177,6 +177,7 @@ set_target_properties(${PLUGIN_TARGET} PROPERTIES
 
 target_sources(${PLUGIN_TARGET} PRIVATE
         ${CMAKE_CURRENT_SOURCE_DIR}/src/lez_indexer_module.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/lez_ffi_marshalling.cpp
 )
 
 set_property(TARGET ${PLUGIN_TARGET} PROPERTY PUBLIC_HEADER
diff --git a/src/i_lez_indexer_module.h b/src/i_lez_indexer_module.h
index eb716fc..8e66025 100644
--- a/src/i_lez_indexer_module.h
+++ b/src/i_lez_indexer_module.h
@@ -17,9 +17,34 @@ public:
     // ModuleProxy invokes by exact meta-type match and delivers caller arguments
     // as QString (the module-viewer reads every parameter as text); a uint16_t
     // parameter would never match. It is parsed to a port number internally.
-    virtual int start_indexer(
-        const QString& config_path,
-        const QString& port
+    virtual int start_indexer(const QString& config_path, const QString& port) = 0;
+
+    // Indexer Queries
+    //
+    // Every parameter is a QString for the same QtRO exact-type-match reason as
+    // `start_indexer` above: callers (consumer modules, the module-viewer) deliver
+    // arguments as QString, so numeric/hash params are passed as text and parsed
+    // internally. Each method returns a compact JSON string (the Logos protocol
+    // data model is JSON-in-strings); an empty string means "not found" or a
+    // failed query (the FFI does not log, so the body qWarns the status code).
+    //
+    // The JSON shape is tailored to what the LEZ explorer's Block/Transaction/
+    // Account models consume (counts/sizes rather than raw arrays). Large 64-bit
+    // values (ids, timestamps, validity windows) are emitted as decimal STRINGS
+    // to avoid the double-precision loss of JSON numbers; counts/sizes are numbers.
+    virtual QString getAccount(const QString& account_id) = 0;
+    virtual QString getBlockById(const QString& block_id) = 0;
+    virtual QString getBlockByHash(const QString& hash) = 0;
+    virtual QString getTransaction(const QString& hash) = 0;
+    // `before` is the optional pagination cursor: a block id to page back from,
+    // or an empty string to start from the tip. `limit` caps the result count.
+    virtual QString getBlocks(const QString& before, const QString& limit) = 0;
+    virtual QString getLastFinalizedBlockId() = 0;
+    // `offset` and `limit` are both required (the paging window).
+    virtual QString getTransactionsByAccount(
+        const QString& account_id,
+        const QString& offset,
+        const QString& limit
     ) = 0;
 };
 
diff --git a/src/lez_ffi_marshalling.cpp b/src/lez_ffi_marshalling.cpp
new file mode 100644
index 0000000..ef28fe6
--- /dev/null
+++ b/src/lez_ffi_marshalling.cpp
@@ -0,0 +1,190 @@
+#include "lez_ffi_marshalling.h"
+
+#include <QtCore/QByteArray>
+#include <QtCore/QJsonDocument>
+#include <algorithm>
+#include <cstring>
+
+namespace marshalling {
+
+    // Lower-case hex of `length` raw bytes (used for 32-byte hashes/ids/keys and
+    // 64-byte signatures). Qt's toHex() avoids a hand-rolled nibble loop.
+    QString bytesToHex(const uint8_t* data, const size_t length) {
+        return QString::fromLatin1(QByteArray(reinterpret_cast<const char*>(data), static_cast<int>(length)).toHex());
+    }
+
+    // FfiU128 is a 16-byte little-endian integer (balances, nonces). C++ has no
+    // native u128, so build the decimal string via __uint128_t (GCC/Clang, 64-bit).
+    QString u128LeToDecimal(const uint8_t data[16]) {
+#if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ >= 16
+        __uint128_t v = 0;
+        for (int i = 0; i < 16; ++i) {
+            v |= static_cast<__uint128_t>(data[i]) << (i * 8);
+        }
+        if (v == 0) {
+            return QStringLiteral("0");
+        }
+        char buf[40];
+        int n = 0;
+        while (v) {
+            buf[n++] = static_cast<char>('0' + static_cast<int>(v % 10));
+            v /= 10;
+        }
+        std::reverse(buf, buf + n);
+        return QString::fromLatin1(buf, n);
+#else
+#error "u128LeToDecimal requires __uint128_t; build with GCC or Clang on 64-bit"
+#endif
+    }
+
+    // 64-bit values are emitted as decimal STRINGS, not JSON numbers: QJsonValue
+    // stores numbers as double, which silently loses precision above 2^53.
+    QString u64ToString(uint64_t v) {
+        return QString::number(static_cast<qulonglong>(v));
+    }
+
+    // Parse a hex string (optionally 0x-prefixed) into a fixed 32-byte FfiBytes32.
+    // Returns false unless it decodes to exactly 32 bytes.
+    bool hexToBytes32(const QString& hex, FfiBytes32* out) {
+        QString trimmed = hex.trimmed();
+        if (trimmed.startsWith(QLatin1String("0x")) || trimmed.startsWith(QLatin1String("0X"))) {
+            trimmed = trimmed.mid(2);
+        }
+        const QByteArray raw = QByteArray::fromHex(trimmed.toLatin1());
+        if (raw.size() != 32) {
+            return false;
+        }
+        std::memcpy(out->data, raw.constData(), 32);
+        return true;
+    }
+
+    QJsonObject ffiAccountToJson(const FfiAccount& account) {
+        QJsonObject obj;
+        obj[QStringLiteral("program_owner")] =
+            bytesToHex(reinterpret_cast<const uint8_t*>(account.program_owner.data), 32);
+        obj[QStringLiteral("balance")] = u128LeToDecimal(account.balance.data);
+        obj[QStringLiteral("nonce")] = u128LeToDecimal(account.nonce.data);
+        obj[QStringLiteral("data_size")] = static_cast<int>(account.data_len);
+        return obj;
+    }
+
+    QJsonObject ffiTransactionToJson(const FfiTransaction& tx) {
+        QJsonObject obj;
+
+        switch (tx.kind) {
+        case Public: {
+            const FfiPublicTransactionBody* body = tx.body.public_body;
+            if (!body) {
+                break;
+            }
+            obj[QStringLiteral("type")] = QStringLiteral("Public");
+            obj[QStringLiteral("hash")] = bytesToHex(body->hash.data, 32);
+            obj[QStringLiteral("program_id")] =
+                bytesToHex(reinterpret_cast<const uint8_t*>(body->message.program_id.data), 32);
+
+            QJsonArray accounts;
+            const FfiAccountIdList& ids = body->message.account_ids;
+            const FfiNonceList& nonces = body->message.nonces;
+            for (uintptr_t i = 0; i < ids.len; ++i) {
+                QJsonObject ref;
+                ref[QStringLiteral("account_id")] = bytesToHex(ids.entries[i].data, 32);
+                ref[QStringLiteral("nonce")] =
+                    i < nonces.len ? u128LeToDecimal(nonces.entries[i].data) : QStringLiteral("0");
+                accounts.append(ref);
+            }
+            obj[QStringLiteral("accounts")] = accounts;
+
+            QJsonArray instructionData;
+            const FfiInstructionDataList& instr = body->message.instruction_data;
+            for (uintptr_t i = 0; i < instr.len; ++i) {
+                instructionData.append(static_cast<double>(instr.entries[i]));
+            }
+            obj[QStringLiteral("instruction_data")] = instructionData;
+            obj[QStringLiteral("signature_count")] = static_cast<int>(body->witness_set.len);
+            break;
+        }
+        case Private: {
+            const FfiPrivateTransactionBody* body = tx.body.private_body;
+            if (!body) {
+                break;
+            }
+            obj[QStringLiteral("type")] = QStringLiteral("PrivacyPreserving");
+            obj[QStringLiteral("hash")] = bytesToHex(body->hash.data, 32);
+
+            QJsonArray accounts;
+            const FfiAccountIdList& ids = body->message.public_account_ids;
+            const FfiNonceList& nonces = body->message.nonces;
+            for (uintptr_t i = 0; i < ids.len; ++i) {
+                QJsonObject ref;
+                ref[QStringLiteral("account_id")] = bytesToHex(ids.entries[i].data, 32);
+                ref[QStringLiteral("nonce")] =
+                    i < nonces.len ? u128LeToDecimal(nonces.entries[i].data) : QStringLiteral("0");
+                accounts.append(ref);
+            }
+            obj[QStringLiteral("accounts")] = accounts;
+
+            obj[QStringLiteral("new_commitments_count")] = static_cast<int>(body->message.new_commitments.len);
+            obj[QStringLiteral("nullifiers_count")] = static_cast<int>(body->message.new_nullifiers.len);
+            obj[QStringLiteral("encrypted_states_count")] =
+                static_cast<int>(body->message.encrypted_private_post_states.len);
+            obj[QStringLiteral("validity_window_start")] = u64ToString(body->message.block_validity_window[0]);
+            obj[QStringLiteral("validity_window_end")] = u64ToString(body->message.block_validity_window[1]);
+            obj[QStringLiteral("signature_count")] = static_cast<int>(body->witness_set.len);
+            obj[QStringLiteral("proof_size")] = static_cast<int>(body->proof.len);
+            break;
+        }
+        case ProgramDeploy: {
+            const FfiProgramDeploymentTransactionBody* body = tx.body.program_deployment_body;
+            if (!body) {
+                break;
+            }
+            obj[QStringLiteral("type")] = QStringLiteral("ProgramDeployment");
+            obj[QStringLiteral("hash")] = bytesToHex(body->hash.data, 32);
+            obj[QStringLiteral("bytecode_size")] = static_cast<int>(body->message.len);
+            break;
+        }
+        }
+
+        return obj;
+    }
+
+    namespace {
+        QString bedrockStatusToString(FfiBedrockStatus status) {
+            switch (status) {
+            case Safe:
+                return QStringLiteral("Safe");
+            case Finalized:
+                return QStringLiteral("Finalized");
+            case Pending:
+            default:
+                return QStringLiteral("Pending");
+            }
+        }
+    } // namespace
+
+    QJsonObject ffiBlockToJson(const FfiBlock& block) {
+        QJsonObject obj;
+        obj[QStringLiteral("block_id")] = u64ToString(block.header.block_id);
+        obj[QStringLiteral("hash")] = bytesToHex(block.header.hash.data, 32);
+        obj[QStringLiteral("prev_block_hash")] = bytesToHex(block.header.prev_block_hash.data, 32);
+        obj[QStringLiteral("timestamp")] = u64ToString(block.header.timestamp);
+        obj[QStringLiteral("signature")] = bytesToHex(block.header.signature.data, 64);
+        obj[QStringLiteral("bedrock_status")] = bedrockStatusToString(block.bedrock_status);
+
+        QJsonArray transactions;
+        for (uintptr_t i = 0; i < block.body.len; ++i) {
+            transactions.append(ffiTransactionToJson(block.body.entries[i]));
+        }
+        obj[QStringLiteral("transactions")] = transactions;
+        return obj;
+    }
+
+    QString jsonToCompactString(const QJsonObject& obj) {
+        return QString::fromUtf8(QJsonDocument(obj).toJson(QJsonDocument::Compact));
+    }
+
+    QString jsonToCompactString(const QJsonArray& arr) {
+        return QString::fromUtf8(QJsonDocument(arr).toJson(QJsonDocument::Compact));
+    }
+
+} // namespace marshalling
diff --git a/src/lez_ffi_marshalling.h b/src/lez_ffi_marshalling.h
new file mode 100644
index 0000000..53b76ac
--- /dev/null
+++ b/src/lez_ffi_marshalling.h
@@ -0,0 +1,48 @@
+#pragma once
+
+#include "lez_indexer_ffi.h"
+
+#include <QtCore/QJsonArray>
+#include <QtCore/QJsonObject>
+#include <QtCore/QString>
+
+// FFI marshalling helpers
+//
+// Bridge the raw C structs returned by the indexer FFI (indexer_ffi.h) to the
+// compact JSON the LEZ explorer's Block/Transaction/Account models consume, and
+// parse the QString inputs back into FFI types. Kept in their own translation
+// unit so lez_indexer_module.cpp stays focused on the query flow and the JSON
+// data model lives in one place — which is also what makes it easy to share
+// with other modules later.
+//
+// These never take ownership of FFI memory: the caller frees it with the
+// matching free_ffi_* function AFTER marshalling.
+//
+// Large 64-bit values (ids, timestamps, validity windows) and 128-bit values
+// (balances, nonces) are emitted as decimal STRINGS to avoid the double-
+// precision loss of JSON numbers; counts/sizes are emitted as numbers.
+namespace marshalling {
+
+    // Lower-case hex of `length` raw bytes (32-byte hashes/ids/keys, 64-byte
+    // signatures).
+    QString bytesToHex(const uint8_t* data, size_t length);
+
+    // FfiU128 is a 16-byte little-endian integer (balances, nonces); rendered
+    // as a decimal string.
+    QString u128LeToDecimal(const uint8_t data[16]);
+
+    // 64-bit value as a decimal string.
+    QString u64ToString(uint64_t v);
+
+    // Parse a hex string (optionally 0x-prefixed) into a fixed 32-byte buffer.
+    // Returns false unless it decodes to exactly 32 bytes.
+    bool hexToBytes32(const QString& hex, FfiBytes32* out);
+
+    QJsonObject ffiAccountToJson(const FfiAccount& account);
+    QJsonObject ffiTransactionToJson(const FfiTransaction& tx);
+    QJsonObject ffiBlockToJson(const FfiBlock& block);
+
+    QString jsonToCompactString(const QJsonObject& obj);
+    QString jsonToCompactString(const QJsonArray& arr);
+
+} // namespace marshalling
diff --git a/src/lez_indexer_ffi.h b/src/lez_indexer_ffi.h
new file mode 100644
index 0000000..ee3b247
--- /dev/null
+++ b/src/lez_indexer_ffi.h
@@ -0,0 +1,14 @@
+#pragma once
+
+// The generated indexer_ffi.h carries no include guard, so including it from
+// more than one header in the same translation unit redefines every type.
+// Wrap it once here (behind #pragma once) and include THIS header instead of
+// <indexer_ffi.h> directly, so the FFI types can be shared by both
+// lez_indexer_module.h and lez_ffi_marshalling.h.
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <indexer_ffi.h>
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/lez_indexer_module.cpp b/src/lez_indexer_module.cpp
index 1a5a33c..13a5616 100644
--- a/src/lez_indexer_module.cpp
+++ b/src/lez_indexer_module.cpp
@@ -1,12 +1,15 @@
 #include "lez_indexer_module.h"
 
-#include <algorithm>
+#include "lez_ffi_marshalling.h"
+
+#include <QtCore/QByteArray>
 #include <QtCore/QDebug>
 #include <QtCore/QJsonArray>
-#include <QtCore/QJsonDocument>
-#include <QtCore/QJsonObject>
+#include <QtCore/QString>
 #include <QtCore/QVariantMap>
 
+using namespace marshalling;
+
 LezIndexerModule::LezIndexerModule() = default;
 
 LezIndexerModule::~LezIndexerModule() {
@@ -66,3 +69,220 @@ int LezIndexerModule::start_indexer(const QString& config_path, const QString& p
 
     return 0;
 }
+
+// === Indexer Queries ===
+//
+// Each method calls the matching query_* FFI function on the handle we already
+// hold (no Runtime needed — the pinned FFI carries its own runtime inside the
+// handle), marshals the returned C struct into compact JSON, then frees the
+// FFI's deep allocations with the matching free_ffi_* function.
+//
+// Known leak: query_* returns its payload in a `Box::into_raw` *outer* box
+// (PointerResult.value), and the free_ffi_* functions free only the inner
+// boxes/vectors (they take the struct by value). The pinned FFI provides no
+// free for the outer box, and libc free() would be UB if Rust's global
+// allocator differs from the system one, so we deliberately leak the small
+// (~8-32 byte) outer wrapper per query. Tracked for an upstream fix (add a
+// free_*_result, or switch the query API to out-params).
+
+QString LezIndexerModule::getAccount(const QString& account_id) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getAccount: indexer not started";
+        return {};
+    }
+
+    FfiAccountId id;
+    if (!hexToBytes32(account_id, &id)) {
+        qWarning() << "getAccount: invalid account id (need 32-byte hex):" << account_id;
+        return {};
+    }
+
+    PointerResult_FfiAccount__OperationStatus res = ::query_account(indexer_service_ffi, id);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getAccount: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    const QString out = jsonToCompactString(ffiAccountToJson(*res.value));
+    ::free_ffi_account(*res.value);
+    return out;
+}
+
+QString LezIndexerModule::getBlockById(const QString& block_id) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getBlockById: indexer not started";
+        return {};
+    }
+
+    bool ok = false;
+    const uint64_t id = block_id.toULongLong(&ok);
+    if (!ok) {
+        qWarning() << "getBlockById: invalid block id:" << block_id;
+        return {};
+    }
+
+    PointerResult_FfiBlockOpt__OperationStatus res = ::query_block(indexer_service_ffi, id);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getBlockById: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    QString out;
+    if (res.value->is_some && res.value->value) {
+        out = jsonToCompactString(ffiBlockToJson(*res.value->value));
+    }
+    ::free_ffi_block_opt(*res.value);
+    return out;
+}
+
+QString LezIndexerModule::getBlockByHash(const QString& hash) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getBlockByHash: indexer not started";
+        return {};
+    }
+
+    FfiHashType h;
+    if (!hexToBytes32(hash, &h)) {
+        qWarning() << "getBlockByHash: invalid hash (need 32-byte hex):" << hash;
+        return {};
+    }
+
+    PointerResult_FfiBlockOpt__OperationStatus res = ::query_block_by_hash(indexer_service_ffi, h);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getBlockByHash: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    QString out;
+    if (res.value->is_some && res.value->value) {
+        out = jsonToCompactString(ffiBlockToJson(*res.value->value));
+    }
+    ::free_ffi_block_opt(*res.value);
+    return out;
+}
+
+QString LezIndexerModule::getTransaction(const QString& hash) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getTransaction: indexer not started";
+        return {};
+    }
+
+    FfiHashType h;
+    if (!hexToBytes32(hash, &h)) {
+        qWarning() << "getTransaction: invalid hash (need 32-byte hex):" << hash;
+        return {};
+    }
+
+    PointerResult_FfiOption_FfiTransaction_____OperationStatus res = ::query_transaction(indexer_service_ffi, h);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getTransaction: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    QString out;
+    if (res.value->is_some && res.value->value) {
+        out = jsonToCompactString(ffiTransactionToJson(*res.value->value));
+    }
+    ::free_ffi_transaction_opt(*res.value);
+    return out;
+}
+
+QString LezIndexerModule::getBlocks(const QString& before, const QString& limit) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getBlocks: indexer not started";
+        return {};
+    }
+
+    bool limitOk = false;
+    const uint64_t limitNum = limit.toULongLong(&limitOk);
+    if (!limitOk) {
+        qWarning() << "getBlocks: invalid limit:" << limit;
+        return {};
+    }
+
+    // `before` is the optional pagination cursor: an empty string means "from
+    // the tip", a non-empty value that fails to parse is an error. `beforeVal`
+    // must outlive the call since FfiOption_u64 borrows its address.
+    uint64_t beforeVal = 0;
+    bool hasBefore = false;
+    if (!before.isEmpty()) {
+        beforeVal = before.toULongLong(&hasBefore);
+        if (!hasBefore) {
+            qWarning() << "getBlocks: invalid before:" << before;
+            return {};
+        }
+    }
+    FfiOption_u64 beforeOpt;
+    beforeOpt.is_some = hasBefore;
+    beforeOpt.value = hasBefore ? &beforeVal : nullptr;
+
+    PointerResult_FfiVec_FfiBlock_____OperationStatus res = ::query_block_vec(indexer_service_ffi, beforeOpt, limitNum);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getBlocks: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    QJsonArray arr;
+    for (uintptr_t i = 0; i < res.value->len; ++i) {
+        arr.append(ffiBlockToJson(res.value->entries[i]));
+    }
+    ::free_ffi_block_vec(*res.value);
+    return jsonToCompactString(arr);
+}
+
+QString LezIndexerModule::getLastFinalizedBlockId() {
+    if (!indexer_service_ffi) {
+        qWarning() << "getLastFinalizedBlockId: indexer not started";
+        return {};
+    }
+
+    PointerResult_u64__OperationStatus res = ::query_last_block(indexer_service_ffi);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getLastFinalizedBlockId: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    // Bare decimal string; the FFI provides no free for the boxed u64 (leaked,
+    // see the note above).
+    return u64ToString(*res.value);
+}
+
+QString LezIndexerModule::getTransactionsByAccount(
+    const QString& account_id,
+    const QString& offset,
+    const QString& limit
+) {
+    if (!indexer_service_ffi) {
+        qWarning() << "getTransactionsByAccount: indexer not started";
+        return {};
+    }
+
+    FfiAccountId id;
+    if (!hexToBytes32(account_id, &id)) {
+        qWarning() << "getTransactionsByAccount: invalid account id (need 32-byte hex):" << account_id;
+        return {};
+    }
+
+    bool offsetOk = false;
+    bool limitOk = false;
+    const uint64_t offsetNum = offset.toULongLong(&offsetOk);
+    const uint64_t limitNum = limit.toULongLong(&limitOk);
+    if (!offsetOk || !limitOk) {
+        qWarning() << "getTransactionsByAccount: invalid offset/limit:" << offset << limit;
+        return {};
+    }
+
+    PointerResult_FfiVec_FfiTransaction_____OperationStatus res =
+        ::query_transactions_by_account(indexer_service_ffi, id, offsetNum, limitNum);
+    if (is_error(&res.error) || !res.value) {
+        qWarning() << "getTransactionsByAccount: indexer FFI error:" << res.error;
+        return {};
+    }
+
+    QJsonArray arr;
+    for (uintptr_t i = 0; i < res.value->len; ++i) {
+        arr.append(ffiTransactionToJson(res.value->entries[i]));
+    }
+    ::free_ffi_transaction_vec(*res.value);
+    return jsonToCompactString(arr);
+}
diff --git a/src/lez_indexer_module.h b/src/lez_indexer_module.h
index 23dde79..3fcb228 100644
--- a/src/lez_indexer_module.h
+++ b/src/lez_indexer_module.h
@@ -1,14 +1,7 @@
 #pragma once
 
 #include "i_lez_indexer_module.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-#include <indexer_ffi.h>
-#ifdef __cplusplus
-}
-#endif
+#include "lez_indexer_ffi.h"
 
 #include <QJsonArray>
 #include <QObject>
@@ -41,6 +34,29 @@ public:
     // Indexer Lifecycle
     Q_INVOKABLE int start_indexer(const QString& config_path, const QString& port) override;
 
+    // Indexer Queries (return compact JSON strings; see i_lez_indexer_module.h)
+    Q_INVOKABLE QString getAccount(const QString& account_id) override;
+    Q_INVOKABLE QString getBlockById(const QString& block_id) override;
+    Q_INVOKABLE QString getBlockByHash(const QString& hash) override;
+    Q_INVOKABLE QString getTransaction(const QString& hash) override;
+    Q_INVOKABLE QString getBlocks(const QString& before, const QString& limit) override;
+    Q_INVOKABLE QString getLastFinalizedBlockId() override;
+    Q_INVOKABLE QString
+    getTransactionsByAccount(const QString& account_id, const QString& offset, const QString& limit) override;
+
+    // Indexer Logging (opt-in)
+    //
+    // Installs the indexer FFI's logger (env_logger) so the indexer's Rust `log`
+    // output surfaces in the host process.
+    //
+    // Commented out because the underlying `::init_logger()` export does not yet
+    // exist in the pinned logos-execution-zone FFI
+    //
+    // Uncomment this single block once the export lands upstream
+    // and the pin is bumped to a rev that includes it.
+    //
+    // Q_INVOKABLE void init_logger() { ::init_logger(); }
+
 signals:
     void eventResponse(const QString& eventName, const QVariantList& data);
 };