lesson_7.md

Goal:

• Understand how to make a basic send transaction through API
• Able to write a script to send a transaction through API

Lesson 7: Making a transaction through API

The API to POST transaction request is: "/cosmos/tx/v1beta1/txs"

Here is the request body:

{
  "tx_bytes": "string",
  "mode": "BROADCAST_MODE_UNSPECIFIED"
}

To make a request through API, we would need to construct a transaction and pass it through tx_bytes field in request body above

To learn more, access "http://localhost:1310" and search for "/cosmos/tx/v1beta1/txs". MUST DEPLOY A BABY NODE FIRST.

Guidelines

Overview of sending a transaction through API

the guide line here will follow example code

1. construct request send body

2. sign tx
3. construct payload with signed tx and broadcast it through API

Code run example

from baby directory,

1. bash scripts/run-node.sh --install
2. cd client
3. npm install
4. npm run-script run
5. query for balance of TO_ADDRESS in client/.env, should increase 1000000000ubaby

Help videos

https://youtu.be/hUInhQ4s1T4

Homework

1. rewrite the script and make a delegation transaction through API. Here is the structure for delegation message

{
    typeUrl: '/cosmos.staking.v1beta1.MsgDelegate',
    value: {
        delegatorAddress: string,
        validatorAddress: string,
        amount: {
            amount: string,
            denom: string,
        },
    },
}