Yes indeed all of them are giving their rates publicly except Commercegate
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https://epoch.com/pricing_rates.html - 13-15% for low volumes
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http://businesscenter.ccbilleu.com/pricing.php - 13-16% for low volumes
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http://www.segpay.com/service-fees.html - 12.5-14.5%
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https://www.zombaio.com/rates.asp - 4.9%
anyone knows about Commercegate ?