Once you have Backend and Frontend deployed, Discord server - testnet. After the basic validation of the setup the team will transfer you 10k test CAPS to register your marketplace.
"SecretNFT API" is the server used by the "SecretNFT" application. This API's purpose is to get data related to NFTs (from blockahin to offchain Data), users, follows and likes.
Secret NFT API is used by Secret NFT and relies on the Ternoa API to get users data. Don't hesitate to have a look on those two repositories on our organisation github