> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-eb-mini-app-ia-overhaul.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# buildMintTransaction

The `buildMintTransaction` function is used to get an unsigned transaction for minting an NFT.

Before using them, make sure to obtain a [Client API Key](https://portal.cdp.coinbase.com/projects/api-keys/client-key) from Coinbase Developer Platform.

{/* ## Usage */}

{/* <CodeGroup>
```tsx code
import { setOnchainKitConfig } from '@coinbase/onchainkit';
import { buildMintTransaction } from '@coinbase/onchainkit/api';

const response = await buildMintTransaction({
mintAddress: '0x...',
takerAddress: '0x...',
tokenId: '1',
quantity: 1,
network: 'networks/base-mainnet',
});
```

```json return value
{
"call_data": {
  "from": "0x...",
  "to": "0x...",
  "data": "0x...",
  "value": "0x000000000001"
}
}
```
</CodeGroup> */}

## Returns

[`Promise<BuildMintTransactionResponse>`](/onchainkit/api/types#buildminttransactionresponse)

## Parameters

[`BuildMintTransactionParams`](/onchainkit/api/types#buildminttransactionparams)

## Types

* [`BuildMintTransactionResponse`](/onchainkit/api/types#buildminttransactionresponse)
* [`BuildMintTransactionParams`](/onchainkit/api/types#buildminttransactionparams)