Amazon Managed Blockchain (AMB) Access Polygon is in preview release and is subject to change.

# Managed Blockchain API and the JSON-RPCs supported with AMB Access Polygon
<a name="polygon-api"></a>

Amazon Managed Blockchain provides API operations for [creating and managing token accessors ](https://docs.aws.amazon.com/managed-blockchain/latest/ambp-dg/polygon-tokens.html)for AMB Access Polygon. For more information, see the * [Managed Blockchain API Reference Guide](https://docs.aws.amazon.com/managed-blockchain/latest/APIReference/Welcome.html) *.

The following topic provides a list and reference of the Polygon JSON-RPCs that AMB Access Polygon supports. Each supported JSON-RPC has a brief description of its use. You use the Polygon JSON-RPCs to query and get smart contract data, get transaction details, submit transactions, and other utilities such as running traces on transactions, and estimate fees. 

AMB Access Polygon supports the following JSON-RPC methods. Each supported JSON-RPC has a category and a brief description of its utility and its default request quotas. Unique considerations for using the JSON-RPC method with Amazon Managed Blockchain are indicated where applicable.

**Note**  
Any methods that aren't listed are not supported.
When making calls to the Polygon JSON-RPCs on Amazon Managed Blockchain, you can do so over an HTTPS connection authenticated using the [Signature Version 4 signing process](https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). This means that only authorized IAM principals in the AWS account can make Polygon JSON-RPC calls. To do this, AWS credentials (an access key ID and a secret access key) must be provided with the call.
You can also use token-based access as a convenient alternative to the Signature Version 4 (SigV4) signing process. If you prioritize security and auditability over convenience, use the SigV4 signing process instead. However, if you use both SigV4 and token-based access, your requests will not work.
JSON-RPC batch requests aren't supported on Amazon Managed Blockchain (AMB) Access Polygon for this preview.
The **Quotas** column in the following table lists the quota for each JSON-RPC. Quotas are set in requests per second (RPS) per Region per Polygon network (Mainnet) for each JSON-RPC.   
For increasing your quota, you must contact Support. To contact Support, sign into the [AWS Support Center Console](https://console.aws.amazon.com/support). Choose **Create case**. Choose **Technical**. Choose *Managed Blockchain* as your **service**. Choose *Access:Polygon* as your **Category** and *General guidance* as your **Severity**. Enter *RPC Quota* as the **Subject** and in the **Description** text box list the JSON-RPC and the quota limits applicable to your needs in *RPS per Polygon network per Region*. **Submit** your case. 

**Topics**

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/managed-blockchain/latest/ambp-dg/polygon-api.html)