diff --git a/db/reg_pollers.lua b/db/reg_pollers.lua
index f4a5395..94d9e13 100644
--- a/db/reg_pollers.lua
+++ b/db/reg_pollers.lua
@@ -23,17 +23,6 @@ function reg_pollers_bootstrap()
     })
 end
 
-function get_free_reg_poller(amount, sym)
-    local rps = nil
-    repeat
-        if rps ~= nil then
-            amount = amount + 1
-        end
-        rps = box.space.reg_pollers.index.by_amount:select{sym, amount}
-    until #rps == 0
-    return amount
-end
-
 local function wrap_rp(rp)
     return {
         id = rp[1],
@@ -45,6 +34,23 @@ local function wrap_rp(rp)
     }
 end
 
+function get_free_reg_poller(amount, sym)
+    local rps = nil
+    repeat
+        if rps ~= nil then
+            local now = fiber.clock64()
+            local rp = wrap_rp(rps[1])
+            if (now - rp['created']) >= 20*60*1000000 then
+                box.space.reg_pollers:delete(rp['id'])
+                break
+            end
+            amount = amount + 1
+        end
+        rps = box.space.reg_pollers.index.by_amount:select{sym, amount}
+    until #rps == 0
+    return amount
+end
+
 function upsert_reg_poller(amount, sym, uid, init_bal)
     local now = fiber.clock64()
     local rps = box.space.reg_pollers.index.by_amount:select{sym, amount}
@@ -54,7 +60,7 @@ function upsert_reg_poller(amount, sym, uid, init_bal)
         if rp['uid'] ~= uid then
             return { err = 'Someone already waits for such transfer.', res = nil }
         end
-        if (now - rp['created']) >= 15*60*1000 then
+        if (now - rp['created']) >= 20*60*1000000 then
             box.space.reg_pollers:delete(rp['id'])
         else
             return { err = nil, res = rp }
diff --git a/src/locales/en.json b/src/locales/en.json
index ff84c8b..acf0153 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -105,7 +105,8 @@
     "memo_fixed": "Memo",
     "to": "Send tokens to address/account",
     "api_error": "Cannot get address. Try again later. If problem still occurs, contact the issuer of ",
-    "api_error_details": "and send the error details:"
+    "api_error_details": "and send the error details:",
+    "free_poller": "НCannot calculate minimal amount. Try again later, please. Or try another currency."
   },
   "invites_jsx": {
     "claim_wrong_secret": "Wrong secret",
diff --git a/src/locales/ru-RU.json b/src/locales/ru-RU.json
index ba646cb..810766e 100644
--- a/src/locales/ru-RU.json
+++ b/src/locales/ru-RU.json
@@ -105,7 +105,8 @@
     "memo_fixed": "Заметка/memo",
     "to": "Отправьте токены на адрес/аккаунт",
     "api_error": "Не удается получить адрес. Попробуйте позднее. Если проблема сохраняется, свяжитесь с эмитентом ",
-    "api_error_details": "и сообщите подробности ошибки:"
+    "api_error_details": "и сообщите подробности ошибки:",
+    "free_poller": "Не удается рассчитать минимальную сумму. Попробуйте позже, или другую валюту."
   },
   "invites_jsx": {
     "claim_wrong_secret": "Неверно указан ключ",
diff --git a/src/modules/register/TransferWaiter.jsx b/src/modules/register/TransferWaiter.jsx
index 0df38e4..f94ea44 100644
--- a/src/modules/register/TransferWaiter.jsx
+++ b/src/modules/register/TransferWaiter.jsx
@@ -37,7 +37,7 @@ class TransferWaiter extends React.Component {
 
     start = async () => {
         this.setState({
-            seconds: 30*60,
+            seconds: 15*60,
             stopped: false
         })
 
diff --git a/src/modules/register/UIARegister.jsx b/src/modules/register/UIARegister.jsx
index 2262e69..23669f6 100644
--- a/src/modules/register/UIARegister.jsx
+++ b/src/modules/register/UIARegister.jsx
@@ -128,6 +128,19 @@ class UIARegister extends React.Component {
                                 }
                             }
 
+                            try {
+                                let fp = await callApi('/api/reg/get_free_poller/' + minAmount.toString())
+                                fp = await fp.json()
+                                if (fp.error) {
+                                    throw new Error(fp.error)
+                                }
+                                minAmount = Asset(fp.amount)
+                            } catch (err) {
+                                console.error(err)
+                                error = tt('uia_register_jsx.free_poller')
+                                break
+                            }
+
                             this.setState({
                                 rules: { ...deposit, creator: asset.creator, telegram },
                                 minAmount,
diff --git a/src/pages/api/reg/[...all].js b/src/pages/api/reg/[...all].js
index 97a4699..49c272b 100644
--- a/src/pages/api/reg/[...all].js
+++ b/src/pages/api/reg/[...all].js
@@ -400,6 +400,7 @@ let handler = nextConnect({ attachParams: true, })
         try {
             initBal = await getBalance()
         } catch (err) {
+            console.error('wait_for_transfer getBalance', initBal)
             throwErr(req, 400, ['Blockchain unavailable'])
         }
 
@@ -438,7 +439,7 @@ let handler = nextConnect({ attachParams: true, })
             }
 
             console.log('wait_for_transfer', initBal.toString(), bal.toString())
-            const delta = bal.amount.minus(initBal.amount)
+            const delta = bal.minus(initBal.amount)
             if (delta.gte(amount)) {
                 let stopMe = false