diff --git a/configs/taler-hacktivism-bank/README.md b/configs/taler-hacktivism-bank/README.md
index 1f51875..a9ace4f 100644
--- a/configs/taler-hacktivism-bank/README.md
+++ b/configs/taler-hacktivism-bank/README.md
@@ -57,7 +57,11 @@ Regional **GOA Exploration Bank** for GNU Taler:
 |-------|---------|
 | `admin` | bank admin (password on host `/root/bank-admin-password.txt`) |
 | `exchange` | Taler exchange wire account (`is_taler_exchange`) |
-| `explorer` | demo user for phone withdraw (`debit_threshold` for regional GOA) |
+| `explorer` | demo user for phone withdraw (`debit_threshold` = amount ceiling) |
+| `DEFAULT_DEBT_LIMIT` | max overdraft for **new** accounts — set to libeufin ceiling `GOA:4503599627370496` (2026-07-16) |
+
+Existing accounts need a one-shot admin `PATCH /accounts/$user` with
+`{"debit_threshold":"GOA:4503599627370496"}` after raising the default (done live for all ~196 accounts).
 
 ## Mobile withdraw (GOA)
 
@@ -91,7 +95,7 @@ For the demo QR (`explorer`), automate step 2:
 # once
 /root/auto-confirm-withdrawals.sh
 # loop (e.g. every 4s)
-nohup /root/auto-confirm-withdrawals.sh --loop 4 >>/var/log/auto-confirm-withdrawals.log 2>&1 &
+nohup /root/auto-confirm-withdrawals.sh --loop 2 >>/var/log/auto-confirm-withdrawals.log 2>&1 &
 ```
 
 Script: `scripts/taler-bank/auto-confirm-withdrawals.sh`  
diff --git a/configs/taler-hacktivism-bank/bank-overrides.conf b/configs/taler-hacktivism-bank/bank-overrides.conf
index 83fb887..37023b5 100644
--- a/configs/taler-hacktivism-bank/bank-overrides.conf
+++ b/configs/taler-hacktivism-bank/bank-overrides.conf
@@ -10,7 +10,8 @@ NAME = "GOA Exploration Bank"
 SERVE = tcp
 PORT = 9012
 BIND_TO = 0.0.0.0
-DEFAULT_DEBT_LIMIT = GOA:100000
+# Exploration: allow very large withdrawals (libeufin amount ceiling ≈ 2^52)
+DEFAULT_DEBT_LIMIT = GOA:4503599627370496
 ALLOW_REGISTRATION = yes
 ALLOW_CONVERSION = no
 REGISTRATION_BONUS = GOA:0