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diff --git a/src/exchangedb/pg_lookup_wire_fee_by_time.h b/src/exchangedb/pg_lookup_wire_fee_by_time.h
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+++ b/src/exchangedb/pg_lookup_wire_fee_by_time.h
@@ -0,0 +1,76 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2022 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 exchangedb/pg_lookup_wire_fee_by_time.h
+ * @brief implementation of the lookup_wire_fee_by_time function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_LOOKUP_WIRE_FEE_BY_TIME_H
+#define PG_LOOKUP_WIRE_FEE_BY_TIME_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+
+
+/**
+ * Lookup information about known wire fees.  Finds all applicable
+ * fees in the given range. If they are identical, returns the
+ * respective @a fees. If any of the fees
+ * differ between @a start_time and @a end_time, the transaction
+ * succeeds BUT returns an invalid amount for both fees.
+ *
+ * @param cls closure
+ * @param wire_method the wire method to lookup fees for
+ * @param start_time starting time of fee
+ * @param end_time end time of fee
+ * @param[out] fees wire fees for that time period; if
+ *             different fees exists within this time
+ *             period, an 'invalid' amount is returned.
+ * @return transaction status code
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_lookup_wire_fee_by_time (
+  void *cls,
+  const char *wire_method,
+  struct GNUNET_TIME_Timestamp start_time,
+  struct GNUNET_TIME_Timestamp end_time,
+  struct TALER_WireFeeSet *fees);
+
+/**
+ * Lookup information about known wire fees.  Finds all applicable
+ * fees in the given range. If they are identical, returns the
+ * respective @a fees. If any of the fees
+ * differ between @a start_time and @a end_time, the transaction
+ * succeeds BUT returns an invalid amount for both fees.
+ *
+ * @param cls closure
+ * @param wire_method the wire method to lookup fees for
+ * @param start_time starting time of fee
+ * @param end_time end time of fee
+ * @param[out] fees wire fees for that time period; if
+ *             different fees exists within this time
+ *             period, an 'invalid' amount is returned.
+ * @return transaction status code
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_lookup_wire_fee_by_time (
+  void *cls,
+  const char *wire_method,
+  struct GNUNET_TIME_Timestamp start_time,
+  struct GNUNET_TIME_Timestamp end_time,
+  struct TALER_WireFeeSet *fees);
+#endif