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CoinGate - CoinGate is a payment gateway for Bitcoin, XRP, Litecoin, Ethereum and 50 other cryptocurrencies.
The Simple Postcard - Text a photo to mail it as a postcard
NOWPayments - NOWPayments is a crypto payment gateway that supports more than 300 cryptocurrencies, including fiat, and offers simple tools to accept crypto payments, like a crypto payments API, plugins, invoices.
Felt for iPhone - Handwritten cards for the modern world
Coinbase - Bitcoin, safe and easy.
Send Mail Get Mail - A postcard-sending website.