# ERC20
## Querying
* Let's work with ERC20 tokens with Blueprint!
* Back to the map, select the drop down menu of **Blueprints** > **Open Level Blueprint** and launch the Level Blueprint Editor
* The following screenshot shows Query the name of ERC20 contract and print it on the screen. In this example, we use a Function - **Spawn Actor from Class** to create an Actor instance from **BP\_DefiWalletCore** Class. The Transformation defines the location, rotation, and scale that will be used by the new Actor. A reference to the new instance is available in the Return Value which feeds as input Value of Function **Erc20Name. Erc20Name** also has an input **Contract Address**, for example, we set it as **0xf0307093f23311FE6776a7742dB619EB3df62969**. Finally, print the token name with Function - **Print String**.
* Click **Compile** > **Play**, **USDC** is printed in the game.
* We can create a variable **contract** and set the default value as **0xf0307093f23311FE6776a7742dB619EB3df62969** for later easy access.
* Similarly, we can call other ERC20 functions by dragging from the **Return Value** of the **SpawnActor BP Defi Wallet Core** and search to add **Erc20Balance**, **Erc20Symbol**, **Erc20Decimals**, and **Erc20TotalSupply** like below
PS: In above example, we use Account Address **0xf0307093f23311FE6776a7742dB619EB3df62969** to query its balance.
## Functions
All ERC20 functions are members of **DefiWalletCoreActor**. The Target should be **Defi Wallet Core Actor**.
### Erc20Balance
Get erc-20 balance
* `Contract Address`: erc20 contract address
* `Account Address`: account address to fetch balance
* `Balance`: get balance of account address
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
### Erc20Name
Get erc-20 name
* `Contract Address`: erc20 contract address
* `Name`: get name
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
### Erc20Symbol
Get erc-20 symbol
* `Contract Address`: erc20 contract address
* `Symbol`:: get symbol
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
### Erc20Decimals
Get erc-20 decimals
* `Contract Address`: erc20 contract address
* `Decimals`: get decimals
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
### Erc20TotalSupply
Get erc-20 total supply
* `Contract Address`: erc20 contract address
* `Total Supply`: get total supply
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
### Erc20Transfer
erc20 Moves `amount` tokens from the caller’s account to `to_address`.
* `Contract Address`: erc20 contract
* `Walletindex`: wallet index which starts from 0
* `To Address`: to address
* `Amount`: amount
* `Out`: Erc20Transfer callback
### Erc20TransferFrom
erc20 Moves `amount` tokens from `from_address` to `to_address` using the allowance mechanism.
* `Contract Address`: erc20 contract
* `Walletindex`: wallet index which starts from 0
* `From Address`: from address to move
* `To Address`: to address
* `Amount`: amount
* `Out`: Erc20TransferFrom callback
### Erc20Approve
erc20 Allows `approved_address` to withdraw from your account multiple times, up to the `amount` amount.
* `Contract Address`: erc20 contract
* `Walletindex`: wallet index which starts from 0
* `Approved Address`: address to approve
* `Amount`: amount
* `Out`: Erc20Approve callback
### Erc20Allowance
Returns the amount of tokens in existence
* `Contract Address`: erc20 contract
* `Erc 20owner`: erc20 owner
* `Erc 20spender`: erc20 spender
* `Result`: allowance
* `Success`: whether succeed or not
* `Output message`: error message, "" if succeed
%20(2).png?alt=media)
%20(1).png?alt=media)
%20(1).png?alt=media)
%20(1).png?alt=media)
%20(2).png?alt=media)
%20(3)%20(1).png?alt=media)
%20(3).png?alt=media)
%20(1).png?alt=media)
%20(2).png?alt=media)
%20(2).png?alt=media)
%20(2)%20(1).png?alt=media)
%20(2).png?alt=media)
%20(2).png?alt=media)