GET ASK/BID VALUES through API

[mabobine]

[B]PROBLEM STATEMENT
[/B]
People have problem in converting international currency rates into local currency rates (Pakistani Rupees). They have to apply formulae on each currency every after the updation (as approx. each currency is updated between 3-8 secs). This is a time consuming activity. As you can see from the below example:
•To convert EUR into Pakistani Ruppee, the formulae is BID * 3.6725 * 17.
•To convert JPY into Pakistani Ruppees, the formulae is 3.6725/ASK * 17

I am planning to launch a website that will convert the international currency rates into Pakistani Rupees rate. People will get benefit from it as they won’t have to do any more calculations to get the corresponding currency.
I am looking forward for the following services:

1.An API to be provided or some other mechanism with the help of which, I can display BID, ASK, LOW, HIGH values of the International currencies on my website.
2.I will have access to the BID, ASK values to apply formulae on it, to get the conversion into Pakistan Ruppees.
3.The following currencies in US Dollar
a.GOLD
b.SILVER
c.EURO
d.GBP
e.SGD
f.AUD
g.JPY
h.CAD
i.CHF
j.DKK
k.NOK
l.SEK
m.NZD
n.ZAR
o.HKD
p.SAR
q.KWD
r.QAR
s.OMR
t.PKR
u.AED

I hope you have understood completely what i am looking for.