I found this tool to be interesting to play with and seems to work pretty well assuming you stay in the same position: https://gazerecorder.com/ I'm guessing a combination of projection mapping, built in lighting, and some crowdsourced data will get accuracy to very usable levels. - Source: Hacker News / 10 months ago

I built this browser extension many years ago and I got an offer for it. I'm planning to sell it for ~20k using the escrow.com. Source: 7 months ago

Another secret: Always read the policy of place that buyer offer for paying and stay away from direct deal, for example escrow.com and PayPal are where the most naive seller get scammed, buyer send payment on Goods&Services and use dispute option and take back his money after securing the account,. Source: 12 months ago

Use a reputable escrow service such as escrow.com. They send the money, it's held by the third party service until they receive the info then once received the money is released to you. Fee is slight and better than being scammed. This one may be legit but the next probably not. Why take the chance. Source: 12 months ago

I had selected escrow.com as payment method, because I have used it before, and while expensive, I trust that process. Source: about 1 year ago

Shipping for $50+ is free. I accept Cash App, Chime, FB Pay, GPay, escrow.com (buyer pays fees, I cover shipping & insurance), and using a middleman. Source: about 1 year ago