# ERC721 Token
## Endpoint
> **Real Server :** [**https://api.lmtls.io/v1/chain/erc721**](https://api.lmtls.io/v1/chain/erc721)
>
> **Test Server :** [**https://test-api.lmtls.io/v1/chain/erc721**](https://test-api.lmtls.io/v1/chain/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"
}
}
}
```
### getMintedTokenId
Return a minted tokenId.
#### Parameters
| Name | Type | Description |
| ------------- | ------ | ------------------------------ |
| transactionId | String | TransactionId of erc721\_mint. |
#### Return Value
| Name | Type | Description |
| ------- | ---------- | ------------------------------------------------- |
| tokenId | BigInteger | minted tokenId. If it is an error, this is null . |
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"tokenId": "1"
}
}
}
```
### 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 |
| 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 \| 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 %}
{% hint style="info" %}
The generated tokenId can be checked using erc721\_getMintedTokenId API.
{% endhint %}
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"transactionId": "0xf7d37be47ce8b563b07aa5e81e17e9722bab...",
"nonce": 32
}
}
}
```
### getURI
Returns an owner and uri data of tokenId.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | ------------------------- |
| contractAddress | String | Contract address of token |
| address | String | Address |
| tokenId | BigInteger | Token Id |
#### Return Value
| Name | Type | Description |
| ----- | ------ | ---------------------- |
| owner | String | Owner's address |
| uri | String | The uri data of token. |
#### Example
```json
{
"jsonrpc": "2.0",
"id": "00456",
"result": {
"resultCode": "200",
"resultMessage": "Success",
"resultData": {
"owner":"0x666cf9aed17a9dfb4ae91b8078...",
"uri":"0xaff42527a42d60ca3fb548fd799b01e6f57e..."
}
}
}
```
### 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": "0xf7d37be47ce8b563b07aa5e81e17e972...",
"noce": 32
}
}
}
```
### 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": "0xf7d37be47ce8b563b07aa5e81e17...",
"nonce": 32
}
}
}
```
### 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": "0xf7d37be47ce8b563b07aa5e81e1...",
"nonce": 32
}
}
}
```
### getApproved
Returns an allowed token spender from owner address.
#### Parameters
| Name | Type | Description |
| --------------- | ---------- | -------------------------- |
| contractAddress | String | Contract address of token. |
| address | String | Owner address |
| 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": "0x666cf9aed17a9dfb4ae91b..."
}
}
}
```
---
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