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Currency in the SDK

About ETH と MATIC​

Regular shops do transactional process through currency such as ETH, which is processed in units of ether. (Just like a dollar) For ETH, wei is the smallest amount of ETH that is calculatable.

1ether === 1000000000000000000wei

ETH in SDK​

In the SDK, the ether unit is assigned to the number type.

In some parts, it is assigned as a BigNumber as wei causes overflow in some environments when assigned as number. As a utility, the SDK provides ways to interchangably go from BigNumber to ether.

  • SDK.formatEther formats a BigNumber to an ether unit, which is returned as a string.
  • SDK.parseEther formats a string as an ether unit, which is returned as a wei in the BigNumber format.

Rinkeby 用の ETH の入手方法​

テスト環境で使える ETH の入手方法は以下の通り

  1. Take note of the wallet address
  2. https://faucet.rinkeby.io/ のサイトにアクセス
  3. Tweet リンクをクリック
  4. 0x0000.....部分を 1 でメモしたアドレスに置換する
  5. Tweet
  6. Add the Tweet URL to the input . Tweet の URL をコピーしサイトの Input に貼り付ける
  7. Press on the "Give me Ether" button.
  8. In due time, the amount will be deposited

Mumbai 用の MATIC の入手方法​

テスト環境で使える MATIC の入手方法は以下の通り

  1. Take note of the wallet address
  2. https://faucet.matic.network/ のサイトにアクセス
  3. Mumbaiを選択
  4. ウォレットアドレスを入力し Submit ボタンを押す
  5. In due time, the amount will be deposited