# ERC721 Token
### erc721\_getBalance
Return an address Token balance.
#### Parameters
| Name | Type | Description |
| --------------- | ------ | -------------------------- |
| contractAddress | String | Contract address of token. |
| address | String | Address |
#### Return Value
| Name | Type | Description |
| ------- | ---------- | ------------------------- |
| balance | BigInteger | Token balance of address. |
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"balance": "10"
}
}
}
```
### erc721\_getTokenUri
Return a minted tokenId URI.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | -------------------------- |
| contractAddress | String | Contract address of token. |
| address | String | Address |
| tokenId | BigInteger | token id |
#### Return Value
| Name | Type | Description |
| ---- | ------ | ------------------ |
| uri | String | minted tokenId uri |
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"uri": "http://www.test.com"
}
}
}
```
### erc721\_mint
Create new token with uri data. Only the token owner can do this..
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| contractAddress | String | Contract address of token |
| sender | String | Address of token owner |
| toAddress | String | Address for mint |
| tokenId | BigInteger | token id |
| uri | String | The uri data to store in the token.
Max length : 100
|
| tempKey | String | tempKey for "mint" |
| hashKey | String | hash(tempKey \| secretKey) |
| signature | String | sign( hash ( contractAddress \| sender \| toAddress \| tokenId \| uri \| tempKey \| hashKey ) ) by owner's privateKey using signData API |
| gasPrice | BigDecimal | gasPrice |
| nonce | BigInteger | nonce value. If it is null, it will be filled in automatically. If acceleration is needed, use the nonce value generated when performing the transaction and use a higher gasPrice than the previous transaction. |
#### Return Value
| Name | Type | Description |
| ------------- | ---------- | -------------- |
| transactionId | String | Transaction Id |
| nonce | BigInteger | nonce value |
{% hint style="info" %}
A transactionId is returned, but that doesn't mean it has been added to the Block yet. You should check that the status is 1 by using net\_getTransactionStatus.
{% endhint %}
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"transactionId": "0xf7d37be47ce8b563b07aa5e81e17e9722bab2e71374d970a558b45c0ed51df7b",
"nonce": 32
}
}
}
```
### erc721\_transfer
Transfer NFT owner from from-address to to-address.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| contractAddress | String | Contract address of token |
| sender | String | Sender address |
| toAddress | String | To address |
| tokenId | BigInteger | Token Id |
| tempKey | String | tempKey for "transfer" |
| hashKey | String | hash(tempKey \| fromAddress' secretKey) |
| signature | String | sign( hash ( contractAddress \| sender \| toAddress \| tokenId \| tempKey \| hashKey ) ) by formAddress's privateKey using signData API |
| gasPrice | BigDecimal | gasPrice |
| nonce | BigInteger | nonce value. If it is null, it will be filled in automatically. If acceleration is needed, use the nonce value generated when performing the transaction and use a higher gasPrice than the previous transaction. |
#### Return Value
| Name | Type | Description |
| ------------- | ---------- | -------------- |
| transactionId | String | Transaction Id |
| none | BigInteger | nonce value |
{% hint style="info" %}
A transactionId is returned, but that doesn't mean it has been added to the Block yet. You should check that the status is 1 by using net\_getTransactionStatus.
{% endhint %}
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"transactionId": "0xf7d37be47ce8b563b07aa5e81e17e9722bab2e71374d970a558b45c0ed51df7b",
"noce": 32
}
}
}
```
### erc721\_transferFrom
Transfer NFT owner from from-address to to-address by spender address.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| contractAddress | String | Contract address of token |
| sender | String | Sender address |
| fromAddress | String | From address |
| toAddress | String | To address |
| tokenId | BigInteger | Token Id |
| tempKey | String | tempKey for "transfer" |
| hashKey | String | hash(tempKey \| fromAddress' secretKey) |
| signature | String | sign( hash ( contractAddress \| sender \| fromAddress \| toAddress \| tokenId \| tempKey \| hashKey ) ) by address's privateKey using signData API |
| gasPrice | BigDecimal | gasPrice |
| nonce | BigInteger | nonce value. If it is null, it will be filled in automatically. If acceleration is needed, use the nonce value generated when performing the transaction and use a higher gasPrice than the previous transaction. |
#### Return Value
| Name | Type | Description |
| ------------- | ---------- | -------------- |
| transactionId | String | Transaction Id |
| nonce | BigInteger | nonce value |
{% hint style="info" %}
A transactionId is returned, but that doesn't mean it has been added to the Block yet. You should check that the status is 1 by using net\_getTransactionStatus.
{% endhint %}
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"transactionId": "0xf7d37be47ce8b563b07aa5e81e17e9722bab2e71374d970a558b45c0ed51df7b",
"nonce": 32
}
}
}
```
### erc721\_approve
Approve token from owner-address to spender-address.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| contractAddress | String | Contract address of token |
| sender | String | Sender address |
| spender | String | Spender address |
| tokenId | BigInteger | Token Id |
| tempKey | String | tempKey for "approve" |
| hashKey | String | hash(tempKey \| fromAddress' secretKey) |
| signature | String | sign( hash ( contractAddress \| sender \| spender \| tokenId \| tempKey \| hashKey ) ) by formAddress's privateKey using signData API |
| gasPrice | BigDecimal | gasPrice |
| nonce | BigInteger | nonce value. If it is null, it will be filled in automatically. If acceleration is needed, use the nonce value generated when performing the transaction and use a higher gasPrice than the previous transaction. |
#### Return Value
| Name | Type | Description |
| ------------- | ------ | -------------- |
| transactionId | String | Transaction Id |
{% hint style="info" %}
A transactionId is returned, but that doesn't mean it has been added to the Block yet. You should check that the status is 1 by using net\_getTransactionStatus.
{% endhint %}
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"transactionId": "0xf7d37be47ce8b563b07aa5e81e17e9722bab2e71374d970a558b45c0ed51df7b",
"nonce": 32
}
}
}
```
### erc721\_getApproved
Returns an allowed token spender from owner address.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | -------------------------- |
| contractAddress | String | Contract address of token. |
| tokenId | BigInteger | Token Id |
#### Return Value
| Name | Type | Description |
| ------- | ------ | ----------------- |
| address | String | Spender's address |
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"address": "0x666cf9aed17a9dfb4ae91b80789dd99803568b11"
}
}
}
```
---
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