Authorize.netThe veteran Visa-owned payment gateway - small US and UK businesses accept cards online, by invoice, or by virtual terminal.
Fees 25 dollars monthly gateway fee plus per-transaction chargesauthorize.net
KivaA non-profit microlending platform where borrowers crowdfund 0% interest loans, including up to 15,000 dollars for US small businesses. Lenders worldwide fund in 25 dollar increments.
Fees 0% interest loans, donations optionalkiva.org
MollieA European payments processor loved by small businesses - accept cards, iDEAL, SEPA, and local methods with simple per-transaction pricing and no lock-in.
Fees Per-transaction pricing, no monthly feesmollie.com
SquareTake card payments in person or online - free card reader, invoices, and an online store, popular with local services and small sellers.
Fees 2.6% plus 15 cents per in-person charge (US Free plan)squareup.com