message: dont pass apikey if not defined
diff: @@ -215,7 +215,8 @@ class Erc20LikeAction {
  `&contractaddress=${contractAddress}`,
  `&address=${address}`,
  `&startblock=0&endblock=99999999`,
  - `&sort=asc&apikey=${this.explorerApiKey}`
  + `&sort=asc`,
  + (this.explorerApiKey !== undefined) ? `&apikey=${this.explorerApiKey}` : ``,
  )
  return apiLooper
  