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Hey! I just had to pay the transaction fee to activate my OpenSea account in the Eth platform. In OpenSea you just have to pay that one-time activation, after that, you can price anything you want, and then, there's a fee that is related to each item when it's sold that will depend on its price.
Thank you!

Espera, que podemos hablar español. 🙆‍♂
¿Entonces en Opensea solo se paga el fee la primera vez? Yo lo he intentado, y el fee estaba alrededor de 100$... ¿Pagaste eso la primera vez?