FAQs

How can I tell if a token is supported for sponsored gasless transactions?

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

executeMetaTransaction

ERC20 tokens using the official Polygon token mapper 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.

permit()

Are all contracts supported?

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 or whitelisted on our paymaster. View the Add ERC2771Recipient guide.

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

Do you support tokens that do not use executeMetaTransaction and permit()for sponsored gasless transactions?

Please contact us at [e-mail] in order to find a solution that works.

Will you support a specific blockchain?

Please contact us at [e-mail] in order to find a solution that works.