What are some real-world examples of companies that have successfully implemented smart contracts in their web applications, and what benefits have they seen?

There are several real-world examples of companies that have successfully implemented smart contracts in their web applications, and have seen significant benefits. Here are a few:

1. Walmart - In 2018, Walmart filed a patent for a smart contract system that would be used to track items in its supply chain. By using smart contracts to automate the tracking process, Walmart aims to increase efficiency and reduce the risk of errors or fraud.
2. Provenance - Provenance is a UK-based company that uses smart contracts to track the supply chain of products, such as food and clothing. By using smart contracts to verify the authenticity and origin of products, Provenance helps to increase transparency and trust in the supply chain.
3. Maersk and IBM - Maersk and IBM have partnered to create a blockchain-based platform called TradeLens, which uses smart contracts to automate the shipping documentation process. By using smart contracts to automate the process, the platform aims to reduce the risk of errors and delays in the shipping process.
4. Ujo Music - Ujo Music is a music distribution platform that uses smart contracts to automate royalty payments to artists. By using smart contracts, Ujo Music aims to increase transparency and reduce the risk of disputes over royalty payments.
5. Slock.it - Slock.it is a company that uses smart contracts to create decentralized, blockchain-based systems for sharing and renting assets, such as cars and apartments. By using smart contracts to automate the rental process, Slock.it aims to increase efficiency and reduce the risk of fraud.

The benefits that these companies have seen from implementing smart contracts in their web applications include increased efficiency, reduced risk of errors or fraud, increased transparency and trust, and automated processes that reduce the need for human intervention.