Crypto (ERC-20)

Welcome to the documentation of the ERC-20 or crypto currencies as it is known worldwide! If you are not so familiar with the smart contract develop, or how you can interact with ERC-20 contract methods Vottun offer this specific interface to make easier this task. With this API, you can easily deploy ERC20 contracts, transfer and allow others to transfer tokens on your behalf, and retrieve all useful information about tokens (name, symbol, total supply, decimals, etc). Let's get started!

Endpoints

Deploy

This endpoint deploys an ERC-20 smart contract and mints the amount of tokens that you want to be created. The call that must be performed is:

POST https://api.vottun.tech/erc/v1/erc20/deploy

Request

The request must include a json body with the following fields:

name	type	required	description	example
`name`	string	yes	This field represents the name of the token.	VottunToken
`symbol`	string	yes	This field represents the symbol the token. It is a shorter abbreviation used to identify the token in a more concise manner.	TKN
`alias`	string	yes	This field represents an alias or a user-friendly nickname for the token. It's often used for display purposes and can provide additional information about the token.	my first token
`initualSupply`	int	yes	This field represents the initial supply of the token.	1000000000000000000000000000
`network`	int	yes	The chain id	43113
`gasLimit`	int	no	the gas price to use in the transaction measured in GWEI. If it is not informed, it is requested to the chain. Required to accelerate a transaction	25000

Example

{
    "name": "VottunToken",
    "symbol": "TKN",
    "alias": "my first token",
    "initialSupply": 1000000000000000000000000000,
    "network": 43113,
    "gasLimit": 6000000
}

Response

It will return a json with the following fields:

name	type	description	example
`contractAddress`	string	The contract Address	0x62F0E381Cd7f3e856176abb2b9cB7Eb02856C511
`txHash`	string	The transaction Hash	0x72f9f35c4fe92b6580..6db6719e903

Example

{
    "contractAddress": "0x62F0E381Cd7f3e..b2b9cB7Eb02856C511",
    "txHash": "0x72f9f35c4fe92b658..c5608c31df06807fc9f5e7243e6db6719e903"
}

Http status

result	http status
The smart contract transaction has been inserted succesfully	201
The request does not include the correct information as per format or content	400
The customer is not authorized	401
There is an error with any of the vottun dependencies or with the customer (in this case contact with Vottun)	503

Transfer

This endpoint transfers amount tokens to the given address. The operation is performed in the given contract and network and the sender of the application must be the owner of the tokens. The call that must be performed is:

POST https://api.vottun.tech/erc/v1/erc20/transfer

Request

The request must include a json body with the following fields:

name	type	required	description	example
`contractAddress`	string	yes	This field represents represent the address of the contract.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`recipient`	string	yes	This field is the account where the tokens are going to be sent.	0xfE463ce3BFda970...C15547D0425D1332A8994a
`network`	int	yes	The chain id	43113
`amount`	int	yes	The amount of tokens you want to transfer	100
`gasLimit`	int	no	the gas price to use in the transaction measured in WEI. If it is not informed, it is requested to the chain. Required to accelerate a transaction	25000

Example

{
    "contractAddress": "0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc",
    "recipient": "0xfE463ce3BFda970...C15547D0425D1332A8994a",
    "network": 43113,
    "amount": 100,
    "gasLimit": 6000000
}

Response

The mutable transaction request will return a json with the following information:

name	type	description	example
`txHash`	string	The transaction Hash	0xb3ba0828ac232..63ddfef73b5d6860a82a6
`nonce`	int	the transaction number from the accounth	27

Example

{
    "txHash": "0xb3ba0828ac232c48b69bb3..63ddfef73b5d6860a82a6",
    "nonce": 27
}

Http status

result	http status
The transaction has been inserted succesfully	201
The request does not include the correct information as per format or content	400
The customer is not authorized	401
There is an error with any of the vottun dependencies or with the customer (in this case contact with Vottun)	503

Transfer from

This endpoint transfers amount tokens from the sender account to the receiver addresse. The operation is performed in the given contract and network. The main difference with the simple transfer is that the who executes the transaction can be different account than the one who owns the tokens. To be able to perform this transfer must receive before an allowance from the owner of the tokens. The call that must be performed is:

POST https://api.vottun.tech/erc/v1/erc20/transferFrom

Request

The request must include a json body with the following fields:

name	type	required	description	example
`contractAddress`	string	yes	This field represents represent the address of the contract.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`sender`	string	yes	This field represents the owner address of the tokens.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`recipient`	string	yes	This field is the account where the tokens are going to be sent.	0xfE463ce3BFda970...C15547D0425D1332A8994a
`network`	int	yes	The chain id	43113
`amount`	int	yes	The amount of tokens you want to transfer	100
`gasLimit`	int	no	the gas price to use in the transaction measured in GWEI. If it is not informed, it is requested to the chain. Required to accelerate a transaction	25000

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF200e36...5b03Ac9d291d9a90Dc",
    "sender": "0xfE463ce3BFda970f3...5547D0425D1332A8994a",
    "recipient": "0xD1Ff54cf0E82eE2A...c809Db3b1232B5496bC58",
    "network": 43113,
    "amount": 1000000000000,
    "gasLimit": 6000000
}

Response

The mutable transaction request will return a json with the following information:

name	type	description	example
`txHash`	string	The transaction Hash	0xb3ba0828ac232..63ddfef73b5d6860a82a6
`nonce`	int	the transaction number from the accounth	27

Example

{
    "txHash": "0xb3ba0828ac232c48b69bb3..63ddfef73b5d6860a82a6",
    "nonce": 27
}

Increase Allowance

This endpoint give the right to manage the addedValue amount of tokens to the spender account. After execute this method the spender can transact with the tokens as if they owned them

POST https://api.vottun.tech/erc/v1/erc20/increaseAllowance

Request

The request must include a json body with the following fields:

name	type	required	description	example
`contractAddress`	string	yes	This field represents represent the address of the contract.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`spender`	string	yes	This field represents the address that will be able to manage the tokens.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`network`	int	yes	The chain id	43113
`gasLimit`	int	no	the gas price to use in the transaction measured in GWEI. If it is not informed, it is requested to the chain. Required to accelerate a transaction	25000
`addedValue`	int	yes	The amount of tokens you want to give the right to manage	100

With a body like this:

{
    "contractAddress": "0xACF9A9678E3AD977E2c14eE230291004D2e37883",
    "spender": "0xfE463ce3BFda970f33C15547D0425D1332A8994a",
    "network": 43113,
    "gasLimit": 6000000,
    "addedValue": 1000000000000
}

Response

The increaseAllowance transaction request will return a json with the following information:

name	type	description	example
`txHash`	string	The transaction Hash	0xb3ba0828ac232..63ddfef73b5d6860a82a6
`nonce`	int	the transaction number from the account	27

Example

{
    "txHash": "0xb3ba0828ac232c48b69bb3..63ddfef73b5d6860a82a6",
    "nonce": 27
}

Decrease Allowance

This endpoint remove the right to manage the subtractedValue amount of tokens to the spender account. After execute this method the spender wont be able to make operation with the tokens at it was before.

POST https://api.vottun.tech/erc/v1/erc20/decreaseAllowance

Request

The request must include a json body with the following fields:

name	type	required	description	example
`contractAddress`	string	yes	This field represents represent the address of the contract.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`spender`	string	yes	This field represents the address that will be able to manage the tokens.	0x9b7127AfAE2cF200...65c5b03Ac9d291d9a90Dc
`network`	int	yes	The chain id	43113
`gasLimit`	int	no	the gas price to use in the transaction measured in GWEI. If it is not informed, it is requested to the chain. Required to accelerate a transaction	25000
`substractedValue`	int	yes	The amount of tokens you want to remove the right to manage	100

With a body like this:

{
    "contractAddress": "0xACF9A9678E3AD977E2c14eE230291004D2e37883",
    "spender": "0xfE463ce3BFda970f33C15547D0425D1332A8994a",
    "network": 43113,
    "gasLimit": 6000000,
    "subtractedValue": 500000000
}

Response

The decreaseAllowance transaction request will return a json with the following information:

name	type	description	example
`txHash`	string	The transaction Hash	0xb3ba0828ac232..63ddfef73b5d6860a82a6
`nonce`	int	the transaction number from the account	27

Example

{
    "txHash": "0xb3ba0828ac232c48b69bb3..63ddfef73b5d6860a82a6",
    "nonce": 27
}

Allowance

This endpoint retrieves the total number of tokens that the owner has authorized the spender to transact.

GET https://api.vottun.tech/erc/v1/erc20/allowance

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001
`owner`	string	The account who owns the tokens	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`spender`	string	The address who have right to manage a number of tokens the owner owns	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc

Example

With a body like this:

{
    "contractAddress": "0xACF9A9678E3AD977E2c14eE23...1004D2e37883",
    "network": 43113,
    "owner": "0x484d9b37697a94c6f...510855f438ea19be7e9",
    "spender": "0xbd3aea19720b31d30d...17e998f8451f52b347c"
}

Response

The response will return a json object with the amount of tokens that the owner allow to manage to the spender

Example

{
    "allowance": 998500000000
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Name

This endpoint retrieves the name of a smart contract. The call that must be performed is:

GET|POST https://api.vottun.tech/erc/v1/erc20/name

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001

Example

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc",
    "network": 80001
}

Response

The response will return a json object with the name of the contract

Example

{
    "name": "VTN ERC20 EXAMPLE"
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Symbol

This endpoint retrieves the symbol of a smart contract. The call that must be performed is:

GET|POST https://api.vottun.tech/erc/v1/erc20/symbol

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001

Example

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc",
    "network": 80001
}

Response

The response will return a json object with the name of the contract

Example

{
    "symbol": "VTN"
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Total supply

This endpoint retrieves the total supply of tokens that have been created in an ERC20 smart contract. The call that must be performed is:

GET|POST https://api.vottun.tech/erc/v1/erc20/totalSupply

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001

Example

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc",
    "network": 80001
}

Response

The response will return a json object with the total supply of the contract

Example

{
    "totalSupply": 1e+27
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Decimals

This endpoint retrieves the decimals used for the tokens of an ERC20 smart contract. The call that must be performed is:

GET|POST https://api.vottun.tech/erc/v1/erc20/decimals

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001

Example

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc",
    "network": 80001
}

Response

The response will return a json object with the number of decimals that the contract manages

Example

{
    "decimals": 18
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Balance Of

This endpoint retrieves the balance of tokens that an address holds. The call that must be performed is:

GET|POST https://api.vottun.tech/erc/v1/erc20/balanceOf

Request

name	type	description	example
`contractAddress`	string	The contract address	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc
`network`	int	the network id	80001
`address`	string	The account where we want to check the token balance	0x9b7127AfAE2cF20...665c5b03Ac9d291d9a90Dc

With a body like this:

{
    "contractAddress": "0x9b7127AfAE2cF200e3665c5b03Ac9d291d9a90Dc",
    "network": 43113,
    "address": "0xfE463ce3BFda970f33C15547D0425D1332A8994a"
}

Response

The response will return a json object with the balance of the address we sent

Example

{
    "balance": 9
}

Http status

result	http status
Information request is successful	200
The request does not include the correct information as per format or content	400
The customer is not authorized	401

Endpoints​

Deploy​

Transfer​

Transfer from​

Increase Allowance​

Decrease Allowance​

Allowance​

Name​

Symbol​

Total supply​

Decimals​

Balance Of​

Endpoints

Deploy

Transfer

Transfer from

Increase Allowance

Decrease Allowance

Allowance

Name

Symbol

Total supply

Decimals

Balance Of