Definitely! You can use Web3API's endpoint URLs to send transactions using wallets such as MetaMask. We have a handy guide on how to do so here.
Web3API only supports the Binance Smart Chain network, on both mainnet and testnet at the moment.
Each dashboard has a maximum limit of 3 projects that can be created at any one time. However, you can delete and create new Projects at anytime.
There is no hard limit on API calls. However, your API key may be rate limited if it causes degradation in quality to ensure other users are not negatively impacted.