Through these sites you can directly spend your cryptocurrencies by paying on chain or buying gift cards. Surely the most complete is Bitrefill: register with an email and set your country. Fill the cart, you will receive an address where you can pay with one of the supported cryptos. You will receive the gift card directly by email. Adopting cryptocurrencies as a payment method allows businesses to stand out and attract a tech-savvy clientele, enhancing their competitiveness in the global market. Some are only for US users, however almost all major countries are available on Bitrefill.
Some Websites:
Gift Cards (Amazon, Zalando, iTunes, Hotels.com, AirBNB, Decathlon, H&M, Adidas, Nike, NordVPN, Walmart, Uber, Apple, Gamestop, Steam, UberEats, Domino's, Super Wine, Taco Bell, Subway, Burger King, Papa John's, phone top-ups, etc): Bitrefill

Gold, Jewelry, Cars, Flights, Watches, Alcohol: Bitdials
Living Room, Kitchen and Home Furniture: Overstock
Computers and Consumer Electronics: Newegg

Precious Metals: Jmbullion and Apmex
Paying Bills: Bitpay
THE ADVANTAGES OF PAYING ONLINE DIRECTLY WITH CRYPTOCURRENCIES
The evolution of financial technologies has led to the growing adoption of cryptocurrencies as a method of online payment. Bitcoin, Solana, Polygon, USDC, USDT and other cryptocurrencies are becoming increasingly popular due to the numerous benefits they offer to both consumers and merchants.
1) Speed and Transparency of Transactions
Cryptocurrencies enable fast transactions, regardless of geographical distance. Thanks to blockchain technology, every payment is traceable and transparent, eliminating the typical waiting times associated with traditional bank transfers.
2) Reduced Transaction Costs
Fees for crypto payments are generally lower than those of traditional methods, especially for international transactions. This is a significant advantage for online businesses looking to offer more competitive prices to their customers.
3) Enhanced Security
Paying with cryptocurrencies eliminates the need to share personal or financial information, such as credit card numbers. This significantly reduces the risk of fraud and data theft.
4) Global Accessibility
Cryptocurrencies are universal and not tied to any specific banking system. This allows unbanked individuals or those in countries with unstable currencies to participate in the global economy, purchasing goods and services online.
5) Privacy
For those seeking greater privacy, many cryptocurrencies offer a higher degree of anonymity compared to traditional payment methods, while still ensuring transaction security and verifiability.
Are you interested in ways to earn crypto bonus? Check it out here: Some Sites To Earn Crypto Bonus (Old & New)