Polygon Testnet – How to Obtain USDT/USDC for Mumbai Testnet

The best way i found was to use these resources:

https://docs.aave.com/developers/deployed-contracts/matic-polygon-market This gets you the token addresses

https://explorer-mumbai.maticvigil.com/address/0x341d1f30e77D3FBfbD43D17183E2acb9dF25574E/write-contract This allows you to write a contract to mint aave for example!

there are other ways you could create the contract to mint the tokens. You will spend MATIC for gas fees but its really not much.

Without the code, it's hard to tell what's going wrong. But a common issue is because of the fact that the Chainlink Client is not able to identify the LINK token contract address on the Mumbai network. If your code contains the following function in the constructor, that might be the source of error.

constructor() {
    setPublicChainlinkToken();
    //rest of the code
}

This function automatically sets the contract address of the LINK token contract for that particular network. It doesn't work properly for Mumbai Network though. So manually setting it should fix it. It can be done the following way.

constructor() {
    address mumbaiLINKContract = 0x326C977E6efc84E512bB9C30f76E30c160eD06FB;
    setChainlinkToken(mumbaiLINKContract);
    //rest of the code
}

Depending on the network you are using, you'll need to input the right contract address. The address provided in the code above is for the Mumbai testnet.

If this doesn't fix the issue, please share the rest of the code so we can take a look.