diff --git a/src/eth_plugin_handler.c b/src/eth_plugin_handler.c
index f7611bbc5..c768c7e43 100644
--- a/src/eth_plugin_handler.c
+++ b/src/eth_plugin_handler.c
@@ -67,7 +67,9 @@ void eth_plugin_prepare_query_contract_UI(ethQueryContractUI_t *queryContractUI,
 
     queryContractUI->screenIndex = screenIndex;
     chain_id = get_tx_chain_id();
-    strlcpy(queryContractUI->network_ticker, get_displayable_ticker(&chain_id), MAX_TICKER_LEN);
+    strlcpy(queryContractUI->network_ticker,
+            get_displayable_ticker(&chain_id, chainConfig),
+            sizeof(queryContractUI->network_ticker));
     queryContractUI->title = title;
     queryContractUI->titleLength = titleLength;
     queryContractUI->msg = msg;
diff --git a/src/handle_get_printable_amount.c b/src/handle_get_printable_amount.c
index a2e333800..a321b4f1c 100644
--- a/src/handle_get_printable_amount.c
+++ b/src/handle_get_printable_amount.c
@@ -7,32 +7,32 @@
 #include "common_utils.h"
 #include "uint256.h"
 #include "string.h"
+#include "network.h"
 
 void handle_get_printable_amount(get_printable_amount_parameters_t* params,
                                  chain_config_t* config) {
-    uint8_t decimals;
     char ticker[MAX_TICKER_LEN];
+    uint8_t decimals;
+    uint64_t chain_id = 0;
+
     memset(params->printable_amount, 0, sizeof(params->printable_amount));
     if (params->amount_length > 32) {
         PRINTF("Amount is too big, 32 bytes max but buffer has %u bytes", params->amount_length);
         return;
     }
 
-    // If the amount is a fee, its value is nominated in ETH even if we're doing an ERC20 swap
+    if (!parse_swap_config(params->coin_configuration,
+                           params->coin_configuration_length,
+                           ticker,
+                           &decimals,
+                           &chain_id)) {
+        PRINTF("Error while parsing config\n");
+        return;
+    }
+    // If the amount is a fee, the ticker should be the chain's native currency
     if (params->is_fee) {
-        uint8_t ticker_len = strnlen(config->coinName, sizeof(config->coinName));
-        memcpy(ticker, config->coinName, ticker_len);
-        ticker[ticker_len] = '\0';
+        strlcpy(ticker, get_displayable_ticker(&chain_id, config), sizeof(ticker));
         decimals = WEI_TO_ETHER;
-    } else {
-        // If the amount is *not* a fee, decimals and ticker are built from the given config
-        if (!parse_swap_config(params->coin_configuration,
-                               params->coin_configuration_length,
-                               ticker,
-                               &decimals)) {
-            PRINTF("Error while parsing config\n");
-            return;
-        }
     }
 
     if (!amountToString(params->amount,
diff --git a/src/handle_swap_sign_transaction.c b/src/handle_swap_sign_transaction.c
index 3b8be8342..f0ca62178 100644
--- a/src/handle_swap_sign_transaction.c
+++ b/src/handle_swap_sign_transaction.c
@@ -5,6 +5,7 @@
 #include "handle_swap_sign_transaction.h"
 #include "shared_context.h"
 #include "common_utils.h"
+#include "network.h"
 #ifdef HAVE_NBGL
 #include "nbgl_use_case.h"
 #endif  // HAVE_NBGL
@@ -27,12 +28,15 @@ bool copy_transaction_parameters(create_transaction_parameters_t* sign_transacti
         return false;
     }
 
-    uint8_t decimals;
     char ticker[MAX_TICKER_LEN];
+    uint8_t decimals;
+    uint64_t chain_id = 0;
+
     if (!parse_swap_config(sign_transaction_params->coin_configuration,
                            sign_transaction_params->coin_configuration_length,
                            ticker,
-                           &decimals)) {
+                           &decimals,
+                           &chain_id)) {
         PRINTF("Error while parsing config\n");
         return false;
     }
@@ -46,7 +50,7 @@ bool copy_transaction_parameters(create_transaction_parameters_t* sign_transacti
     }
 
     // If the amount is a fee, its value is nominated in ETH even if we're doing an ERC20 swap
-    strlcpy(ticker, config->coinName, MAX_TICKER_LEN);
+    strlcpy(ticker, get_displayable_ticker(&chain_id, config), sizeof(ticker));
     decimals = WEI_TO_ETHER;
     if (!amountToString(sign_transaction_params->fee_amount,
                         sign_transaction_params->fee_amount_length,
diff --git a/src/network.c b/src/network.c
index 4107abaa5..74c5feefe 100644
--- a/src/network.c
+++ b/src/network.c
@@ -136,11 +136,11 @@ uint64_t get_tx_chain_id(void) {
     return chain_id;
 }
 
-const char *get_displayable_ticker(const uint64_t *chain_id) {
+const char *get_displayable_ticker(const uint64_t *chain_id, const chain_config_t *chain_cfg) {
     const char *ticker = get_network_ticker_from_chain_id(chain_id);
 
     if (ticker == NULL) {
-        ticker = chainConfig->coinName;
+        ticker = chain_cfg->coinName;
     }
     return ticker;
 }
diff --git a/src/network.h b/src/network.h
index ccde23701..ee96347b5 100644
--- a/src/network.h
+++ b/src/network.h
@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include "chainConfig.h"
 
 #define UNSUPPORTED_CHAIN_ID_MSG(id)                                              \
     do {                                                                          \
@@ -16,4 +17,4 @@ bool app_compatible_with_chain_id(const uint64_t *chain_id);
 
 uint64_t get_tx_chain_id(void);
 
-const char *get_displayable_ticker(const uint64_t *chain_id);
+const char *get_displayable_ticker(const uint64_t *chain_id, const chain_config_t *chain_cfg);
diff --git a/src/swap_utils.c b/src/swap_utils.c
index 2fa4a5a56..8a5db8691 100644
--- a/src/swap_utils.c
+++ b/src/swap_utils.c
@@ -22,22 +22,38 @@
 #include "asset_info.h"
 #include "swap_utils.h"
 
-bool parse_swap_config(const uint8_t *config, uint8_t config_len, char *ticker, uint8_t *decimals) {
+bool parse_swap_config(const uint8_t *config,
+                       uint8_t config_len,
+                       char *ticker,
+                       uint8_t *decimals,
+                       uint64_t *chain_id) {
     uint8_t ticker_len, offset = 0;
+
     if (config_len == 0) {
         return false;
     }
-    ticker_len = config[offset++];
-    if (ticker_len == 0 || ticker_len > MAX_TICKER_LEN - 2 || config_len - offset < ticker_len) {
+    ticker_len = config[offset];
+    offset += sizeof(ticker_len);
+    if ((ticker_len == 0) || (ticker_len > (MAX_TICKER_LEN - 2)) ||
+        ((config_len - offset) < (ticker_len))) {
         return false;
     }
     memcpy(ticker, config + offset, ticker_len);
     offset += ticker_len;
     ticker[ticker_len] = '\0';
 
-    if (config_len - offset < 1) {
+    if ((config_len - offset) < 1) {
         return false;
     }
     *decimals = config[offset];
+    offset += sizeof(*decimals);
+
+    // the chain ID was adder later to the CAL swap subconfig
+    // so it is optional for retro-compatibility (as it might not be present)
+    if ((config_len - offset) >= sizeof(*chain_id)) {
+        PRINTF("Chain ID from the swap subconfig = 0x%.*h\n", sizeof(*chain_id), &config[offset]);
+        *chain_id = u64_from_BE(config + offset, sizeof(*chain_id));
+        offset += sizeof(*chain_id);
+    }
     return true;
 }
diff --git a/src/swap_utils.h b/src/swap_utils.h
index 00af3d342..76ca90e56 100644
--- a/src/swap_utils.h
+++ b/src/swap_utils.h
@@ -19,4 +19,8 @@
 
 #include <stdint.h>
 
-bool parse_swap_config(const uint8_t* config, uint8_t config_len, char* ticker, uint8_t* decimals);
+bool parse_swap_config(const uint8_t* config,
+                       uint8_t config_len,
+                       char* ticker,
+                       uint8_t* decimals,
+                       uint64_t* chain_id);
diff --git a/src_features/signTx/logic_signTx.c b/src_features/signTx/logic_signTx.c
index de62f6cb7..b40bfb9c4 100644
--- a/src_features/signTx/logic_signTx.c
+++ b/src_features/signTx/logic_signTx.c
@@ -200,7 +200,7 @@ static void address_to_string(uint8_t *in,
 
 static void raw_fee_to_string(uint256_t *rawFee, char *displayBuffer, uint32_t displayBufferSize) {
     uint64_t chain_id = get_tx_chain_id();
-    const char *feeTicker = get_displayable_ticker(&chain_id);
+    const char *feeTicker = get_displayable_ticker(&chain_id, chainConfig);
     uint8_t tickerOffset = 0;
     uint32_t i;
 
@@ -323,7 +323,7 @@ __attribute__((noinline)) static void finalize_parsing_helper(bool direct, bool
     char displayBuffer[50];
     uint8_t decimals = WEI_TO_ETHER;
     uint64_t chain_id = get_tx_chain_id();
-    const char *ticker = get_displayable_ticker(&chain_id);
+    const char *ticker = get_displayable_ticker(&chain_id, chainConfig);
     ethPluginFinalize_t pluginFinalize;
 
     *use_standard_UI = true;