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It's possible to ADD your site or niches related BITCOINS,Virtual Currency Exchange ecc on DMOZ Directory under the following categories :

Social science => Economy => Money and Finance

I'm collaborating with Dmoz top editor to ensure that your website will be included without delay

Below is a sample of a RELATED CATEGORY where your site will be listed :
http://www.dmoz.org/World/Fran%C3%A7ais/Sciences/Sciences_humaines_et_sociales/Economie/Monnaie_et_finance/

English and Non-english sites are acceptable.

Cost: 0.18 BTC

Method Of Payment : Your own mode of payment