diff --git a/db/reg_pollers.lua b/db/reg_pollers.lua
index fc9584d..20287ab 100644
--- a/db/reg_pollers.lua
+++ b/db/reg_pollers.lua
@@ -42,7 +42,7 @@ local function wrap_rp(rp)
     }
 end
 
-function get_free_reg_poller(amount, sym, now)
+function get_free_reg_poller(amount, sym, step, now)
     local rps = nil
     repeat
         if rps ~= nil then
@@ -51,7 +51,7 @@ function get_free_reg_poller(amount, sym, now)
                 box.space.reg_pollers:delete(rp['id'])
                 break
             end
-            amount = amount + 1
+            amount = amount + step
         end
         rps = box.space.reg_pollers.index.by_amount:select{sym, amount}
     until #rps == 0
diff --git a/src/pages/api/reg/[...all].js b/src/pages/api/reg/[...all].js
index da25ee2..0885063 100644
--- a/src/pages/api/reg/[...all].js
+++ b/src/pages/api/reg/[...all].js
@@ -324,10 +324,12 @@ let handler = nextConnect({ attachParams: true, })
 
         let freeAmount
         try {
+            const amountStep = 1 / Math.pow(10, amount.precision || 1)
             freeAmount = await Tarantool.instance('tarantool')
             .call('get_free_reg_poller',
                 parseFloat(amount.amountFloat),
                 amount.symbol,
+                amountStep,
                 Date.now()
             )
             freeAmount = freeAmount[0][0]