What happened 

Avalanche (CRYPTO:AVAX)Polkadot (CRYPTO:DOT), and Solana (CRYPTO:SOL) are up 33.03% and 12.56% and down 22.75%, respectively, in the past seven days, as of 2:47 p.m. EDT on Friday. They are now trading at a respective $64.60, $33.45, and $140.51 apiece.

Developers behind Avalanche announced on Sept. 16 that it raised $230 million via a token sale to private investors. The Avalanche Foundation plans to use the proceeds to accelerate its transformation in the decentralized finance (DeFi) space. The smart contract platform enables scalability, low transaction fees, and interchain communications.

As for Polkadot, the Internet of Blockchain network is gaining significant traction. Due to its ability to issue parachains, crypto developers would no longer need to build their own blockchains and can simply use Polkadot's existing infrastructure. On Sept. 17, data company Crown Sterling launched its own encrypted, quantum-resistant block explorer on Polkadot.

Lastly, there were record amounts of profit-taking on decentralized applications (dapps) token Solana after investor euphoria sent it rallying over 100% in the past months. In fact, so many users transferred SOL from their wallets to exchanges to cash out that it sent the network offline for 17 hours on Sept. 15, further increasing its uncertainty. 

Selecting options on a holographic DeFi panel.

Image source: Getty Images.

So what 

Over 225 projects are under development on the Avalanche blockchain. For example, Tether, the company behind the $68 billion USDT stablecoin, is in the initial stages of launching USDT on Avalanche. Meanwhile, Polkadot has 494 projects on its network ranging from dapps to wallets to transaction validators and more. This also includes multibillion-dollar oracle token Chainlink. Finally, notable projects on Solana involve stablecoin USD Coin and FTX, the third-largest cryptocurrency exchange in the world -- both of which are choosing the Solana network for its fast settlement capabilities. 

Now what 

All three are mid-cap tokens in the DeFi space, with market caps ranging from $15 billion to $45 billion. But that's just the beginning for this promising sector. In early 2020, DeFi was essentially unheard of. Still, now, its total addressable market has grown to a staggering $177.37 billion and has already made new highs after a bearish capital flight in May. Moreover, the fundamental value of Avalanche, Polkadot, and Solana's projects are quickly catching up to their valuation. Hence, it's best to hold steady in the face of record volatility and let these promising tokens add wealth to your blockfolio

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.