To make money with NFT it is essential to have a strategy. Investors who use appropriate strategies are more likely to achieve short and long term returns. In addition to the classic CryptoPunks and Bored Ape, there are tons of projects that are doing incredible numbers. From Illuvium to Mfers, passing through Doodles and Invisible Friends. There are many strategies, sites and tools to be used to study volumes, market caps, holders. They are all fundamental parameters. But what are the metrics that should be observed before buying?
1) Study of the project (roadmap) and of the team (some teams are anonymous, here you can not do anything)
2) Check Twitter followers and Discord subscribers. These data are very important because they tell us if a community is active. Clearly you have to pay attention to any bots and fake followers so the posts on a page or in a group should be viewed. You have to make a relationship between followers of the Twitter page and interactions in the posts. If a page has 50,000 followers but achieves 10 likes per post, it sure is very strange
3) One of the best ways to not spend too much in the initial stages of launching a project is to join the Discord server to try to get a whitelist (which allows you to buy NFT from that collection in pre-sale). Here you will find many statistics (also on influencers): Mintyscore

4) Trading volumes and market capitalization. This is a smart technique for identifying the right NFT design. A good platform that provides some of these metrics is Rarity Tools (new NFT and mint projects), for trading volumes you can also use Opensea (Rankings)
5) Holders. This stats takes into account the number of addresses that have one or more NFT. There must be as many holders as possible because this indicates a larger community and a less manipulable price. If the total number of holders are 8000 out of a total of 10000 NFT, this indicates "unique" holders of 80% (average). If an address has many NFTs from the same collection, it could decide to sell many, causing the floor price to collapse, following the cascading sales of other people as well. You can find this metric and many other stats on Dune.xyz (just search for the NFT project of your interest) or on Icy.tools

6) NFT "On Chain" and "Off Chain". NFT created with smart contracts and which are purchased in a decentralized way on a non-custodial wallet are preferable. Off chain NFT minted on a platform (for example an exchange but not only) are on average less valuable
7) Rarity. NFT with less supply are rarer than others (any demand always exceeds supply). I will find a lot of stats on Raritysniffer. In this regard, the technical characteristics of the asset and their rarity must also be analyzed (which on OpenSea can be viewed by pressing on "properties". I trivially consider the rarest characteristics of an NFT and see how many there are around)

8) Another technique is to check how many vendors are selling NFT of that collection with a certain feature. If there are few sellers it is a good thing (if there are many sellers, a reverse auction on the market price of that NFT can be triggered. In that case you should wait and not sell it, if you still see a potential greater than the market price . If the prices of the same NFT are very close, the price could go down because it means that the sellers are eager to sell and the "floor price" is constantly lowered, as soon as someone lists at a price slightly lower than theirs)
9) Trends (with also market caps, volumes, floor prices and hodlers) you can use Icy.tools and NFTscoring
10) Trends on search engines. You can use Google Trends (by searching for NFT or a collection). When the rating (from 0 to 100) is high, it implies that many people are taking an interest in what you have been looking for and indirectly signals a favorable moment of purchase. On the other hand, when the search for terms related to NFT is low, it means that you will have to proceed with caution as fewer individuals show interest in that asset

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