s Array | String onDownloadProgress function On progress callback function. Recive chunk. See: https://github.com/nebulasio/wiki/blob/master/rpc.md#subscribe Returns: eventData Example var api = new Neb().api; api.subscribe({topics: [\"chain.linkBlock\", \"chain.pendingTransaction\"]}).then(function(eventData) { //code }); gasPrice() Return current gasPrice. See: https://github.com/nebulasio/wiki/blob/master/rpc.md#getgasprice Returns: Gas Price Example var api = new Neb().api; api.gasPrice().then(function(