Bitcoinica Helper (userscript)

[proudhon]

Working for me too on both my machines.  Though, yesterday to test it out I took a small long position that I was pretty sure would get zhoutonged.  Your helper told me the zhoutong price was around 6.39, but my position held until the low 30s.

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[M4v3R]

I'm using the calculations posted by zhoutong, so I think they're correct.

There's a small bug in the code though that may affect the result of calculations a bit - it takes only first two digits from the bid/ask price (it's because in the code they are split up to make the rest of digits gray). On small positions this could show up as a visible difference, and you just saw it.

I've fixed that error and pushed a new version. Remember to uninstall the old one, because you can end up with two different versions running at the same time.

EDIT: It's not that easy to actually test that. I've created a 10:1 leveraged 9.5 BTC position (having 1 BTC on account) and here's the result:



I should've shorted, because I don't think we'll hit 6.2 again

[Zotia]

I have a small feature request.  I would like to be able to click on the quantity buttons even if I don't have enough money to buy.  I want this because:
-Sometimes I want to sell using those buttons.
-Sometimes I want to buy more BTC after the price goes up.

Needing to refresh the page or enter the number manually is rather annoying (when those buttons are already there but just grayed out).

I'm using the calculations posted by zhoutong, so I think they're correct

I found your problem.


This:

Code:

			// Long
			if (amount > 0)
				min_price = Math.round((ask - ((net_value - maintenance)/(amount + btc))) * 100) / 100;

			// Short
			else
				min_price = Math.round((bid - ((net_value - maintenance)/(amount - btc))) * 100) / 100;

Should be this:

Code:

			// Long
			if (amount > 0)
				min_price = Math.round((bid - ((net_value - maintenance)/(amount + btc))) * 100) / 100;

			// Short
			else
				min_price = Math.round((ask - ((net_value - maintenance)/(amount - btc))) * 100) / 100;

(Notice the change to "bid" and "ask").


It seems to fix it.


To test it to see if it was accurate, I changed it like this:

Code:

			// Long
			if (amount > 0)
				min_price = (bid - ((net_value - maintenance)/(amount + btc));

			// Short
			else
				min_price = (ask - ((net_value - maintenance)/(amount - btc));

(Notice the removal of "Math.round").


This allowed me to have it display all of the digits it uses.

I tested it for a 10:1 account:

-Manually doing the calculation resulted in 6.665561463414634146341463414635
-Using the test script resulted in 6.665561463414635

So it's accurate to 15 digits.  (By accurate, I mean it yields the same result as doing it manually).



Now that it works correctly, I wanted it to show 4 digits instead of 2, so I changed it like this.

Code:

			// Long
			if (amount > 0)
				min_price = Math.round((bid - ((net_value - maintenance)/(amount + btc))) * 10000) / 10000;

			// Short
			else
				min_price = Math.round((ask - ((net_value - maintenance)/(amount - btc))) * 10000) / 10000;

(Notice the change from "100" to "10000").




With this change, it will now display the correct minimum price to 4 digits.




PS: Thank you for making this script. 

[M4v3R]

Wow, thanks for the correction . I've incorporated the changes into the script. I've also added a function to enable all "quick pick" buttons.

[Zotia]

Wow, thanks for the correction . I've incorporated the changes into the script. I've also added a function to enable all "quick pick" buttons.

Wow, that was quick!


Thank you! 

[Maged]

Wow, thanks for the correction . I've incorporated the changes into the script. I've also added a function to enable all "quick pick" buttons.

You forgot to bump the version number in the OP. Don't worry, I did it for you.

Oh, and if you ever need any help on this, I'd be happy to assist you.

[M4v3R]

You forgot to bump the version number in the OP. Don't worry, I did it for you.

Oh, and if you ever need any help on this, I'd be happy to assist you.

Thanks! This is nice about Bitcoin community, everybody tries to help to get better Bitcoin ecosystem .

[Zotia]

I found another bug.


Sometimes, the BTC/USD prices are updated separately from the panel on the right.  When this happens, the "net value" is based upon a BTC/USD price that was updated at a different time.  This means that the "Min price" will be changed.   The "Min price" should never change.


It actually had a significant effect on the "Min price" today, due to the volatility.  At one point, the value was inaccurate off by over 0.10 BTC/USD.



I'm not sure how this could be fixed.

[cypherdoc]

I found another bug.


Sometimes, the BTC/USD prices are updated separately from the panel on the right.  When this happens, the "net value" is based upon a BTC/USD price that was updated at a different time.  This means that the "Min price" will be changed.   The "Min price" should never change.


It actually had a significant effect on the "Min price" today, due to the volatility.  At one point, the value was inaccurate off by over 0.10 BTC/USD.



I'm not sure how this could be fixed.

wonderful.

[MelMan2002]

Nice script!

[M4v3R]

New version of the script

Added feature: shows you how much BTC are your dollars worth and vice-versa, when you hover your mouse over these values:



Please post some more suggestions how we could improve Bitcoinica and I'll see what I can do .

[stochastic]

New version of the script

Added feature: shows you how much BTC are your dollars worth and vice-versa, when you hover your mouse over these values:

Sweet.  Could you add a function calculate the user's current margin call rate?

[vokain]

someone check the code if it doesn't track our positions, anddd donation link/adderss? This is very useful, and I know some appreciative donations would probably incentivize you for improvements too

[Maged]

someone check the code if it doesn't track our positions

Done. Version 1.2.0 is completely safe, as of this message.

@M4v3R: You can get rid of line 12-20. Mootools makes unsafeWindow obsolete. I'm glad to see that you moved away from unsafeWindow, though.

[M4v3R]

@Maged: Yeah, the code for unsafeWindow is obsolete now. I've also changed "addMootools" function to just "addScript", because it wasn't loading Mootools (I wanted to do that in the first place, but I've changed my mind), just adding the script to main page body. Thanks for the suggestion.

[elux]

Did bitcoinica swaps break the script? I got wrong data and had to disable it.

[legitnick]

Did bitcoinica swaps break the script? I got wrong data and had to disable it.

Yeah my base price is 5.40 and it says my liquidation price is at 5.9 on my long position.

[waspoza]

Did bitcoinica swaps break the script? I got wrong data and had to disable it.

Yup, looks broken to me.

[M4v3R]

Yeah, I guess it could break the script if they've changed HTML on the site. I'll look at this later today.

[MelMan2002]

A quick fix for those interested (not sure if it is complete):
Change line 75 from:
net_value = USER_ParseCurrency(account_data[13].innerHTML);
to:
net_value = USER_ParseCurrency(account_data[15].innerHTML);

and Change line 76 from:
maintenance = USER_ParseCurrency(account_data[15].innerHTML);
to:
maintenance = USER_ParseCurrency(account_data[17].innerHTML);