How to send a test transaction with rest api?

[iwfynow]

Discord user ID

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Describe your question in detail.

I want to create a Dart SDK for the aptos blockchain to use in a Flutter app. There are some dart package on pub.dev that claim to be Aptos SDKs, but they don't work - all of them throw errors when i try to send a transaction. That's why i want to build my own SDK. To do that, i need learn how to send a test transaction or simulate to the Aptos network. How can i do that.

What error, if any, are you getting?

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What have you tried or looked at? Or how can we reproduce the error?

I can already create a wallet and perform simple request, such as getting the balance, timestamp, estimating gas, and so on. However, sending a transaction is much harder because it requires handling complex structures and data types. Dart and Typescipt have incompatible types, which leads to many potential issues and makes debugging difficult.
I want to understand how to inspect the raw payload when sending a transaction using curl. If i can see exactly what data is sent i can start building my SDK step by step, checking the result at each stage.

Which operating system are you using?

N/A

Which SDK or tool are you using? (if any)

REST API

Describe your environment or tooling in detail

No response