diff --git a/stack-orchestrator/compose/docker-compose-testnet-onboarding-app.yml b/stack-orchestrator/compose/docker-compose-testnet-onboarding-app.yml
index 8ef20ea..9e457a3 100644
--- a/stack-orchestrator/compose/docker-compose-testnet-onboarding-app.yml
+++ b/stack-orchestrator/compose/docker-compose-testnet-onboarding-app.yml
@@ -12,6 +12,7 @@ services:
       CERC_LACONICD_DENOM: ${CERC_LACONICD_DENOM:-photon}
       CERC_FAUCET_ENDPOINT: ${CERC_FAUCET_ENDPOINT:-http://localhost:4000}
       CERC_WALLET_META_URL: ${CERC_WALLET_META_URL:-http://localhost:3000}
+      CERC_SUMSUB_API_ENDPOINT: ${CERC_SUMSUB_API_ENDPOINT:-http://localhost:3001}
     command: ["bash", "/scripts/onboarding-app-start.sh"]
     volumes:
       - ../config/app/onboarding-app-start.sh:/scripts/onboarding-app-start.sh
diff --git a/stack-orchestrator/config/app/onboarding-app-start.sh b/stack-orchestrator/config/app/onboarding-app-start.sh
index 09ff96c..d726376 100755
--- a/stack-orchestrator/config/app/onboarding-app-start.sh
+++ b/stack-orchestrator/config/app/onboarding-app-start.sh
@@ -13,6 +13,7 @@ echo "CERC_LACONICD_RPC_ENDPOINT: ${CERC_LACONICD_RPC_ENDPOINT}"
 echo "CERC_LACONICD_DENOM: ${CERC_LACONICD_DENOM}"
 echo "CERC_FAUCET_ENDPOINT: ${CERC_FAUCET_ENDPOINT}"
 echo "CERC_WALLET_META_URL: ${CERC_WALLET_META_URL}"
+echo "CERC_SUMSUB_API_ENDPOINT: ${CERC_SUMSUB_API_ENDPOINT}"
 
 # Build with required env
 REACT_APP_WALLET_CONNECT_ID=$WALLET_CONNECT_ID \
@@ -23,6 +24,7 @@ REACT_APP_LACONICD_RPC_ENDPOINT=$CERC_LACONICD_RPC_ENDPOINT \
 REACT_APP_LACONICD_DENOM=$CERC_LACONICD_DENOM \
 REACT_APP_FAUCET_ENDPOINT=$CERC_FAUCET_ENDPOINT \
 REACT_APP_WALLET_META_URL=$CERC_WALLET_META_URL \
+REACT_APP_SUMSUB_API_ENDPOINT=$CERC_SUMSUB_API_ENDPOINT \
 yarn build
 
 http-server -p 80 /app/build
diff --git a/stack-orchestrator/stacks/onboarding-app/README.md b/stack-orchestrator/stacks/onboarding-app/README.md
index 9928880..fcce68c 100644
--- a/stack-orchestrator/stacks/onboarding-app/README.md
+++ b/stack-orchestrator/stacks/onboarding-app/README.md
@@ -74,6 +74,9 @@ Instructions for running the `testnet-onboarding-app` using [laconic-so](https:/
 
   # laconic wallet meta URL (default: http://localhost:3000)
   CERC_WALLET_META_URL=
+
+  # Onboarding API endpoint (default: http://localhost:3001)
+  CERC_SUMSUB_API_ENDPOINT=
   ```
 
 ## Start the deployment