# Quaiscan smart-contract verification API

This is the preferred option for contract verification via API. However, you can also use RPC endpoints, [more info is available here](/developer-support/api/rpc-endpoints/contract.md#verify-a-contract-with-its-source-code-and-contract-creation-information).

### License type

You can specify license type of the smart contract as `string` or `number`. For example for `GNU General Public License v2.0 (GNU GPLv2)` you could pass either `4` or `"gnu_gpl_v2"`

We are supporting such types of license as:

```
1. No License (None)
2. The Unlicense (Unlicense)
3. MIT License (MIT)
4. GNU General Public License v2.0 (GNU GPLv2)
5. GNU General Public License v3.0 (GNU GPLv3)
6. GNU Lesser General Public License v2.1 (GNU LGPLv2.1)
7. GNU Lesser General Public License v3.0 (GNU LGPLv3)
8. BSD 2-clause "Simplified" license (BSD-2-Clause)
9. BSD 3-clause "New" Or "Revised" license* (BSD-3-Clause)
10. Mozilla Public License 2.0 (MPL-2.0)
11. Open Software License 3.0 (OSL-3.0)
12. Apache 2.0 (Apache-2.0)
13. GNU Affero General Public License (GNU AGPLv3)
14. Business Source License (BSL 1.1)
```

API license types:

```
none
unlicense
mit
gnu_gpl_v2
gnu_gpl_v3
gnu_lgpl_v2_1
gnu_lgpl_v3
bsd_2_clause
bsd_3_clause
mpl_2_0
osl_3_0
apache_2_0
gnu_agpl_v3
bsl_1_1
```

### Verify smart contract

Use the appropriate Quaiscan instance endpoint to verify if the smart contract microservice is enabled.

In the following examples we use <https://quaiscan.io> to query the network.

{% openapi src="/files/2XGgLzR3qI2V0Uyi8ksk" path="/api/v2/smart-contracts/verification/config" method="get" %}
[openapi (2).json](https://3049643675-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F38YKcjYqMJT3HBhioNFl%2Fuploads%2Fgit-blob-bb5fda23314f38e0d35f63df5bc5167b6dbab46f%2Fopenapi%20\(2\).json?alt=media)
{% endopenapi %}

{% hint style="warning" %}
`0x` contract addresses in POST example urls below should be replaced with your contract hash supplied on contract creation. Variables in the body are examples and should be replaced with your contract details.
{% endhint %}

## Flattened contract

For more information on parameters to pass, see the [flattened source code information on the Verifying a smart contract page](/developer-support/smart-contract-verification.md#via-flattened-source-code).

{% openapi src="/files/2XGgLzR3qI2V0Uyi8ksk" path="/api/v2/smart-contracts/0xb12cad649a56e67188bbaa56583c18dc7d2812ed/verification/via/flattened-code" method="post" %}
[openapi (2).json](https://3049643675-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F38YKcjYqMJT3HBhioNFl%2Fuploads%2Fgit-blob-bb5fda23314f38e0d35f63df5bc5167b6dbab46f%2Fopenapi%20\(2\).json?alt=media)
{% endopenapi %}

## Via Standard JSON input

For more information on parameters to pass, see the [flattened source code information on the Verifying a smart contract page](/developer-support/smart-contract-verification.md#via-flattened-source-code). `0x` contract in POST example should be replaced with your contract hash.

{% openapi src="/files/2XGgLzR3qI2V0Uyi8ksk" path="/api/v2/smart-contracts/0x9c1c619176b4f8521a0ab166945d785b92aef453/verification/via/standard-input" method="post" expanded="false" %}
[openapi (2).json](https://3049643675-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F38YKcjYqMJT3HBhioNFl%2Fuploads%2Fgit-blob-bb5fda23314f38e0d35f63df5bc5167b6dbab46f%2Fopenapi%20\(2\).json?alt=media)
{% endopenapi %}

## Multi-part Solidity files

{% openapi src="/files/2XGgLzR3qI2V0Uyi8ksk" path="/api/v2/smart-contracts/0x030f7c7dbd472864220bcf9e37ede1b8a3125970/verification/via/multi-part" method="post" %}
[openapi (2).json](https://3049643675-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F38YKcjYqMJT3HBhioNFl%2Fuploads%2Fgit-blob-bb5fda23314f38e0d35f63df5bc5167b6dbab46f%2Fopenapi%20\(2\).json?alt=media)
{% endopenapi %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.quaiscan.io/developer-support/smart-contract-verification/blockscout-smart-contract-verification-api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.