The 803 Mine Pool is a multi-currency mining pool, with a 1% fee. It uses the PROP system with automatic payments every 2 minutes for confirmed blocks at a minimum balance of 0.01 for all coins, SHA256, Scrypt, Groestl & X11 Mining Pools. There is no registration needed and all block rewards for each coin are shared amongst miners. Running across multiple secure enterprise-grade dedicated/cloud hardware in different geographical military-grade data centers with high availability, redundancy, web & share D.O.S protection, firewalls, encryption, and regular backups + friendly mining support.
upd 2021: On 803 Mine Pool, People Cannot Withdraw Their Funds
For a period of time, there were concerns about the pool's legitimacy. People were reporting about being unable to withdraw their funds or even access the wallet associated with the pool account. The support team was staying silent to questions from the users experiencing such types of problems. As the pool wasn't too popular there were only a few public user reports and discussions about the platform.
In 2021, the amount of negative feedback increased as the pool website went offline. It seems that 803 Mine turned out to be a scam and now former pool users are trying to sue the platform. Currently, there is no way to use this pool and no need to try it as it's clearly a bad mining pool that doesn't give miners what they've mined there.
Unfortunately, often it is hard to tell if the company is a scam or not. Especially, when there is so little info about the project and almost no user reports that could help understand that the company is a no-go until it's too late. There were several quite positive Reddit posts about 803 Mine in the past. Probably for some time the pool was letting people withdraw their coins. However, know we know that the company abused the trust of people.