Provenart

Provenart is a blockchain-based Art-Tech platform where users can discover and upload art collections securely. In practice that means accepting cards, bank transfers and wallets online or in person.

The natural audience is any business that takes money. Alongside the main category they mention Art and Blockchain. They are a very small team, 1 to 10 people, which usually shapes who they work with. You will probably talk to the people who build it, which is great until you need 24/7 support.

Provenart is based in New York, New York. Their site is provenart.io.

Things worth asking about: rates, payout timing, chargeback handling, and developer tools. A short pilot with your real data tells you more than any demo.

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