Thank you all for you answers.

I contacted more than 10 exchangers without result.
Thanks for the tip to contact chartbuddy, hopefully he can help me out.

Meanwhile if someone has an idea, I am (and probably others) still interested.

Thanks again !

Hi all,

I am a master student writing a thesis on bitcoin. One of the aspect consist in analysing bitcoin's liquidity. Therefore I would need an history of the bid-ask spreads. Until now, I have been unsuccessful, can anyone help me out ?

Thanks