Transfer Fees, Metadata, and Soulbound Tokens: A Tour of Solana Token Extensions (opens in new tab)

In Web2, adding a transfer fee means building middleware. On Solana, it's a flag. I built four tokens in six days. Here's what I learned. A few weeks ago, I knew nothing about Solana tokens. I'd used Solana for transfers and read account data, but tokens felt like a black box. I wanted to understand how they actually work, not just copy-paste commands but know what each flag does and why it matters. The Basic Mint My first token was barebones. No name. No symbol. Just an address. spl-token cr...