I was almost motivated to do something along those lines. But I couldn't come up with a reason for doing it, .... as in, yes -- TradeHill had days when they were 20% of the market. But what benefit is there in knowing that information?
Anyways, here's how the data can be collected:
-
http://bitcoincharts.com/charts/chart.json?m=mtgoxUSD&i=Daily&c=1&s=2010-07-14&e=2012-05-06And here a compilation of the various symbols:
Current, active:
-------------------------------
bcEUR
bitfloorUSD
bitmarketEUR
bitmarketPLN
bitmarketUSD
bitnzNZD
bitstampUSD
btc24EUR
btcdeEUR
btceUSD
btcexUSD
btcnCNY
btctreeUSD
cbxUSD
cryptoxAUD
cryptoxUSD
icbitUSD
imcexEUR
imcexUSD
intrsngEUR
intrsngGBP
intrsngPLN
intrsngUSD
kptnSEK
mrcdBRL
mtgoxAUD
mtgoxCAD
mtgoxCHF
mtgoxCNY
mtgoxDKK
mtgoxEUR
mtgoxGBP
mtgoxHKD
mtgoxJPY
mtgoxNZD
mtgoxPLN
mtgoxRUB
mtgoxSEK
mtgoxSGD
mtgoxTHB
mtgoxUSD
rockEUR
rockSLL
rockUSD
vcxEUR
vcxUSD
virtexCAD
virwoxSLL
No longer used
---------------------------------------
b2cUSD
b7EUR
b7USD
bbmBRL
bcmBMUSD
bcmLRUSD
bcmMBUSD
bcmPPUSD
bcmPXGAU
bitchangePLN
bitmarketAUD
bitmarketGBP
bitmarketRUB
bitomatPLN
britcoinGBP
btcexEUR
btcexJPY
btcexRUB
btcexWMZ
btcexYAD
exchbUSD
freshPLN
globalEUR
globalGBP
globalPLN
globalUSD
ruxumAUD
ruxumCHF
ruxumEUR
ruxumGBP
ruxumHKD
ruxumHUF
ruxumJPY
ruxumPLN
ruxumRUB
ruxumSEK
ruxumSGD
ruxumTHB
ruxumUAH
ruxumUSD
ruxumZAR
thAUD
thCLP
thEUR
thINR
thLRUSD
thUSD
wbxAUD
I don't know that all the data is reliable. For instance, there were concerns that some exchanges were feeding bogus volume, possibly to make it seem like greater liquidity was available. So keep that in mind.