buy fails when buy_pct = 100

[Burnie09]

System information

• Have I written custom code (as opposed to using zenbot vanilla): no
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Linux Ubuntu 16.04
• Zenbot version: unstable
• NodeJS version: v8.9.4
• Python version: 2.7.12
• Exact command to reproduce: buy (maker) - buy_pct = 100

Describe the problem

( GDAX.BTC-EUR / maker )

When zenbot is adjusting a (maker) buy, it adjusts price, but doesn't seem to adjust size to buy.
Having c.buy_pct = 100 will result in not enough funds.
Workaround is using c.buy_pct = 99 (will not work if slippage > ~1.01%)

example below:

• buy (manual/maker) with 100% of 609.93 EUR
• puts out a buy for 0.08790594 @ 6938.53 = 609.93 EUR
• then auto-adjusts it to 0.08790594 @ 6938.69 = 609.95 EUR

Source code / logs

• added some more verbose output to the debug (size and price)

2018-02-10 16:23:31 6938.79 BTC-EUR +0.11% 2 --- 28.15 -0.0643 0.0243 0.00000 BTC 609.93 EUR +0.00% +1.99%

manual limit BUY command executed
2018-02-10 16:23:42 - placing buy order...
2018-02-10 16:23:42 - buy order placed at 6938.53 EUR
2018-02-10 16:23:44 - order status: open
2018-02-10 16:23:46 - order status: open
2018-02-10 16:23:48 - order status: open
2018-02-10 16:23:50 - order status: open
2018-02-10 16:23:50 - 6938.54 vs our 6938.53
2018-02-10 16:23:50 - cancelling order
2018-02-10 16:23:51 - buy order timed out, adjusting price
2018-02-10 16:23:51 - placing buy order...
2018-02-10 16:23:51 - not enough balance for buy, aborting - 0.08790594 @ 6938.69
2018-02-10 16:23:51 - not enough balance, or signal switched, cancel buy

2018-02-10 16:23:52 6938.79 BTC-EUR +0.11% 2 --- 28.15 -0.0643 0.0243 0.00000 BTC 609.93 EUR +0.00% +1.99%

[defkev]

This is correct and has been reported before.

Unless an order has been partially filled a re-order will always use the same size, which inevitable causes a insufficient funds error if the price moved up.

Looking at the code one possible solution would be to remove the size attribute during a price adjust if the order has not been partially filled, this way executeSignal recalculates the size according to the new price.

[defkev]

PR ready.

Test it and report back @Burnie09

[Burnie09]

It seems to be working (added some more debug to check);

2018-02-10 20:16:18 - placing buy order...
2018-02-10 20:16:19 - buy order for 0.08683668 placed at 6866.91 EUR (596.2996662588)

2018-02-10 20:16:17 6862.32 BTC-EUR +0.20% 1 - 49.64 0.0347 0.0196 buying 0.00000 BTC 596.29 EUR

2018-02-10 20:16:22 - 6867.33 vs our 6866.91
2018-02-10 20:16:23 - buy order timed out, adjusting price
2018-02-10 20:16:24 - buy order for 0.08683137 placed at 6867.33 EUR (596.2996721421)

2018-02-10 20:16:34 - 6867.34 vs our 6867.33
2018-02-10 20:16:35 - buy order timed out, adjusting price
2018-02-10 20:16:36 - buy order for 0.08683124 placed at 6867.34 EUR (596.2996477016)
...
2018-02-10 20:17:32 - order status: open
2018-02-10 20:17:32 - 6890.09 vs our 6889.67
2018-02-10 20:17:32 - cancelling order
2018-02-10 20:17:33 - buy order timed out, adjusting price
2018-02-10 20:17:34 - placing buy order...
2018-02-10 20:17:34 - buy order for 0.08654466 placed at 6890.08 EUR (596.2996309728)
2018-02-10 20:17:36 - order status: done

buy order completed at 2018-02-10 20:17:34:
0.08683668 BTC at 6890.08 EUR
total 598.311 EUR
0.3374% slippage (orig. price 6866.91 EUR)
execution: a minute

2018-02-10 20:18:00 6867.75 BTC-EUR -0.28% 2 50.74 + 0.0354 0.0376 bought 0.08654 BTC 0.00 EUR

Seems the size in the completion text is the original size (0.08683668), but it works. - 100% bought.

[defkev]

100% bought

👍

I wonder why we are tracking size as _order.orig_size in my_trades though 🤔

[defkev]

nvm.

If this was a partial order we of course would wont the original size duh

We could change it in placeOrder and (maybe) add a adjusted flag if _order exists.

[defkev]

Thats actually a silly hack as it doesn't account for timed out partial orders.

I'll switch one of my bots to 100% and think of a proper solution once i have the time.

[Burnie09]

Just to let you know. I can confirm your findings. Partial orders just stops.
(And then you don't seem to manually buy the rest either.)