Error Type argument count mismatch when calling 0x1::managed_coin::register

[codebuster22]

I'm trying to swap Aptos to USDT on testnet using Aptos SDK.

Aptos SDK typescript version: 1.10.0

I'm getting an error Error: Type argument count mismatch, expected 1, received 0

Here's the code snippet:

const aptosConfig = new AptosConfig({ network: Network.TESTNET });
this.aptos = new Aptos(aptosConfig);
this.aptosSigner = Account.fromPrivateKey({privateKey})
const toToken = "0x43417434fd869edee76cca2a4d2301e528a1551b1d719b75c350c3c97d15b8b9::coins::USDT"
const coinRegisterPayload = {
            type: 'entry_function_payload',
            function: '0x1::managed_coin::register',
            type_arguments: [toToken],
            arguments: []
          }
          console.log(coinRegisterPayload);
         // coinRegisterPayload: {
         //    type: 'entry_function_payload',
         //    function: '0x1::managed_coin::register',
         //    type_arguments: [
         //         '0x43417434fd869edee76cca2a4d2301e528a1551b1d719b75c350c3c97d15b8b9::coins::USDT'
         //      ],
          //     arguments: []
          // }

          const transaction = await this.aptos.transaction.build.simple({
            sender: this.aptosSigner.accountAddress,
            data: coinRegisterPayload,
          });
          const committedTransaction = await this.aptos.signAndSubmitTransaction({
            signer: this.aptosSigner,
            transaction,
          });

I faced this same issue in September then I left Aptos, now getting into Aptos, and getting this error. I saw the data tab in Pontem wallet when swapping APTOS to USDT on liquidswap (testnet), the data is same. I'm confused on why I'm getting this error.

[0xmaayan]

It looks like the syntax is wrong (I assume you used to work with the legacy SDK syntax).
Try changing it to

const coinRegisterPayload = {
  function: '0x1::managed_coin::register',
  typeArguments: [toToken],
  functionArguments: []
}

For reference, take a look at this example https://github.com/aptos-labs/aptos-ts-sdk/blob/main/examples/typescript/simple_transfer.ts#L78-L85

[codebuster22]

I'm still getting an error. Here's how the new code look like:

          const coinRegisterPayload = {
            type: 'entry_function_payload',
            function: '0x1::managed_coin::register',
            type_arguments: [toToken],
            functionArguments: []
          }
          console.log(coinRegisterPayload);

          const transaction = await this.aptos.transaction.build.simple({
            sender: this.aptosSigner.accountAddress,
            data: coinRegisterPayload,
          });
          const committedTransaction = await this.aptos.signAndSubmitTransaction({
            signer: this.aptosSigner,
            data: transaction,
          });

I checked the example, I'm doing the same thing.

[0xmaayan]

your coinRegisterPayload object is different, check out the object keys.

const coinRegisterPayload = {
  type: 'entry_function_payload', // remove it
  function: '0x1::managed_coin::register',
  type_arguments: [toToken], // change to typeArguments
  functionArguments: []
}

[codebuster22]

Thanks this solved it.
I have a question, more on the ecosystem part.
What are some AMM aggregator who have SDK for swap that we can use.

Thanks a lot for the help.

[gregnazario]

One of the aggregators I can think of is Panora, though I'm unsure if they have an SDK for swapping

[0xmaayan]

Can look at Panora or Kana Labs