# FAQs

## Embedded wallets <a href="#are-embedded-wallets-a-separate-application" id="are-embedded-wallets-a-separate-application"></a>

#### Are embedded wallets a separate application? <a href="#are-embedded-wallets-a-separate-application" id="are-embedded-wallets-a-separate-application"></a>

An embedded wallet is not a standalone wallet app like Metamask or Coinbase Wallet. Instead, it serves as the wallet layer with which your dApp provides an interface to interact with the blockchain. Simply put, your dapp is the wallet.

#### Can I use the same crypto account for testnet (Amoy) and mainnet Polygon? <a href="#can-i-use-the-same-crypto-account-for-testnet-amoy-and-mainnet-polygon" id="can-i-use-the-same-crypto-account-for-testnet-amoy-and-mainnet-polygon"></a>

A crypto account on Amoy will work on Mainnet Polygon and vice versa. Please make sure you select the correct network if funds are not appearing correctly.

#### Is the SDK open source? <a href="#is-the-sdk-open-source" id="is-the-sdk-open-source"></a>

Yes! Visit us at <https://github.com/rally-dfs/>

## Gasless Transactions

#### How can I tell if a token is supported for sponsored gasless transactions? <a href="#how-can-i-tell-if-a-token-is-supported-for-sponsored-gasless-transactions" id="how-can-i-tell-if-a-token-is-supported-for-sponsored-gasless-transactions"></a>

We support tokens that use the following methods to enable gasless transactions:

`executeMetaTransaction`

ERC20 tokens using the official [Polygon token mapper](https://mapper.polygon.technology/) prior to January 2023 automatically inherited `executeMetaTransact`. This can be verified by checking that a token's Contract Name is *UChildERC20Proxy*. [RLY Token for reference.](https://polygonscan.com/token/0x76b8D57e5ac6afAc5D415a054453d1DD2c3C0094#code)

`permit()`

#### Are all contracts supported? <a href="#are-all-contracts-supported" id="are-all-contracts-supported"></a>

Not all contracts are supported by our SDK out of the box. Here are some error messages you may encounter:

1. `Paymaster rejected in server: isTrustedForwarder: reverted.`
   1. In order to enable sponsored gasless transactions, the contract must be [ERC2771 compatible](https://docs.opengsn.org/contracts/#install-opengsn-contracts) or whitelisted on our paymaster. View the [Add ERC2771Recipient guide](https://docs.rallyprotocol.com/v/flutter/gasless-transactions/guides/add-erc2771recipient).
2. `Paymaster rejected in server: invalid forwarder for recipient.`
   1. External contracts are required to set the trusted forwarder address to
      1. Amoy: `0x0ae8FC9867CB4a124d7114B8bd15C4c78C4D40E5`
      2. Mainnet: `0xB2b5841DBeF766d4b521221732F9B618fCf34A87`
   2. View the [code example](https://gist.github.com/DonGambas/230389f11dc5f10137a510527175e01e)

#### Do you support tokens that do not use `executeMetaTransaction` and `permit()`for sponsored gasless transactions? <a href="#do-you-support-tokens-that-do-not-use-executemetatransaction-and-permit-for-sponsored-gasless-transa" id="do-you-support-tokens-that-do-not-use-executemetatransaction-and-permit-for-sponsored-gasless-transa"></a>

Please contact us at <partnerships@rallyprotocol.com> in order to find a solution that works.

#### Will you support a specific blockchain? <a href="#will-you-support-a-specific-blockchain" id="will-you-support-a-specific-blockchain"></a>

Please contact us at <partnerships@rallyprotocol.com> in order to find a solution that works.

[<br>](https://docs.rallyprotocol.com/v/flutter/gasless-transactions/guides/determining-the-gasless-transaction-method)

[<br>](https://docs.rallyprotocol.com/v/flutter/embedded-wallets/how-it-works)


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