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diff --git a/src/include/taler_sq_lib.h b/src/include/taler_sq_lib.h
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+++ b/src/include/taler_sq_lib.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file include/taler_sq_lib.h
+ * @brief helper functions for DB interactions with SQLite
+ * @author Jonathan Buchanan
+ */
+#ifndef TALER_SQ_LIB_H_
+#define TALER_SQ_LIB_H_
+
+#include <sqlite3.h>
+#include <jansson.h>
+#include <gnunet/gnunet_sq_lib.h>
+#include "taler_util.h"
+
+/**
+ * Generate query parameter for a currency, consisting of the
+ * components "value", "fraction" in this order. The
+ * types must be a 64-bit integer and a 64-bit integer.
+ *
+ * @param x pointer to the query parameter to pass
+ */
+struct GNUNET_SQ_QueryParam
+TALER_SQ_query_param_amount_nbo (const struct TALER_AmountNBO *x);
+
+
+/**
+ * Generate query parameter for a currency, consisting of the
+ * components "value", "fraction" in this order. The
+ * types must be a 64-bit integer and a 64-bit integer.
+ *
+ * @param x pointer to the query parameter to pass
+ */
+struct GNUNET_SQ_QueryParam
+TALER_SQ_query_param_amount (const struct TALER_Amount *x);
+
+
+/**
+ * Generate query parameter for a JSON object (stored as a string
+ * in the DB).  Note that @a x must really be a JSON object or array,
+ * passing just a value (string, integer) is not supported and will
+ * result in an abort.
+ *
+ * @param x pointer to the json object to pass
+ */
+struct GNUNET_SQ_QueryParam
+TALER_SQ_query_param_json (const json_t *x);
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param currency currency to use for @a amount
+ * @param[out] amount where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_SQ_ResultSpec
+TALER_SQ_result_spec_amount_nbo (const char *currency,
+                                 struct TALER_AmountNBO *amount);
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param currency currency to use for @a amount
+ * @param[out] amount where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_SQ_ResultSpec
+TALER_SQ_result_spec_amount (const char *currency,
+                             struct TALER_Amount *amount);
+
+
+/**
+ * json_t expected.
+ *
+ * @param[out] jp where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_SQ_ResultSpec
+TALER_SQ_result_spec_json (json_t **jp);
+
+
+#endif  /* TALER_SQ_LIB_H_ */
+
+/* end of include/taler_sq_lib.h */