Gift of Exploration?

Some of my guild mate says they sell some of their extra Gift of exploration to some random guy in LA.Is it possible???

You cannot directly sell the Gift of Exploration.

What you can do is obtain the Gift of Exploration, Gift of Battle, 250 obsidian shards and 200 spirit shards, make the Gift of Mastery and then "sell" it to another player by having them send you all the other materies to make a gen 1 legendary, make the final product in the Mystic Forge and send it back them, in return for an agreed amount of gold.

There is a risk of getting scammed however, because the exchange has to happen outside of the Trading Post. The risk for the person 'buying' the Gift of Mastery is obvious - they have to hand over all the other materials for a legendary and trust that they'll get the final thing back, but there's also a risk for the person 'selling' the Gift in that the recipient may take the finished legendary and never send the gold. It's up to the people involved to decide how they want to manage that. One option is to use a middle-man both players trust who will recieve all the trade goods and only give them to the intended recipients once everything has been handed over.

Alternatively you can make a gen 1 legendary yourself and sell it on the Trading Post. That's much lower risk (the worst than can happen is it doesn't sell, or you have to re-list it and lose the gold you paid for the fee) but of course it has a much higher up front cost.

some people also sell their Gifts over reddit, but its accountbound

Its done like this: You give you materials to "Gift-Guy" ,he combines the gift with your given materials , Gift-Guy gives you the outcome & you pay for him using up his gift